From patchwork Wed Nov 9 00:26:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 623366 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB6A2C4332F for ; Wed, 9 Nov 2022 00:27:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229614AbiKIA1C (ORCPT ); Tue, 8 Nov 2022 19:27:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229682AbiKIA1A (ORCPT ); Tue, 8 Nov 2022 19:27:00 -0500 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D2DC22B09; Tue, 8 Nov 2022 16:26:58 -0800 (PST) Received: by mail-pj1-x102f.google.com with SMTP id k5so15254855pjo.5; Tue, 08 Nov 2022 16:26:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=8HJkA3m4z41ixW5vvs68RcjpRXugbjaOG03xYMJ1aMU=; b=VHsT1EGD9tJ34WuQQ1Qbir5Vxt6aJBOoAscjc6yalFK6ff2MqQUG/0DV6w0HydBvSr snhh4rTbYGQilO3o5GCal9NNdP7UzkQhDxXWOA7yx5thYVkZc8Z+06TCiD68LTCW/dUY xwFA6kwdWGaIoBZ0jP1w7AKlisF7ZXj6VJOjRVV8W3kbZjDR6Cqvdksy+VceEc7kD0Cv KiYSoXWY86yk9gbidT/ewQZGbiFGjBAmirvNLUI5Ac+KABeV06pppMK/izygB7alag9o 1kUchZYojqZ7c4GHFfYY8RqBybrwkvDF0bCeQmVzz4ZAni1v+EkKJCxoJ+2jP9HaGdmy oR5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=8HJkA3m4z41ixW5vvs68RcjpRXugbjaOG03xYMJ1aMU=; b=w4f99WVOY58zJG8Py5qOMLgku0Bfyoh78ye1qyMNKY7ubMOaC8W80Ub6gSYqamN3OI ommCAsNVgiyVE7/UPieu1BADKFBZzJuhIpPD/UcKlEW0Ah10Hfdp8D6VOxrTcPbroClq 5WQqLjZM2jxMmcnjdyaH0S0Prwuvr+GmPe512JAN9vjH1pkDIsjomR+IQOlgQIst6rtt K4Qo4yQ9nmo6beDhrWsYhBrYdf8AZeenvFKTEIuBbonxo5+3eHd2yAmZBmXzCURpRGFh ezlIMRRMDr+kGYYBwG/dmbrblbU7abmFx33h0LmQ1M/2/gWVzzo52i4XZAg32MSudWeE v+5g== X-Gm-Message-State: ACrzQf3wWBPbFFkqRHqzhdTu/NBqNEkhf3Co/0zmRu6WqtLbiEh3Wzm7 v4x0iL81THu0zCM+Bjz9ZBE= X-Google-Smtp-Source: AMsMyM6nYv4o2uKe5M8vynUJRJroWNmAElDOB5drYxz5p9+alkZJYv9+eEFCukKf0UIzixhe/EpD4A== X-Received: by 2002:a17:903:2489:b0:187:3a59:570a with SMTP id p9-20020a170903248900b001873a59570amr40310676plw.35.1667953617725; Tue, 08 Nov 2022 16:26:57 -0800 (PST) Received: from dtor-ws.mtv.corp.google.com ([2620:15c:9d:2:9f46:7242:26:f220]) by smtp.gmail.com with ESMTPSA id i65-20020a626d44000000b0056bd737fdf3sm6907324pfc.123.2022.11.08.16.26.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Nov 2022 16:26:57 -0800 (PST) From: Dmitry Torokhov To: Linus Walleij , Andy Shevchenko , Bartosz Golaszewski Cc: linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/6] gpiolib: of: change of_find_gpio() to accept device node Date: Tue, 8 Nov 2022 16:26:46 -0800 Message-Id: <20221031-gpiolib-swnode-v2-1-81f55af5fa0e@gmail.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog In-Reply-To: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> References: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> MIME-Version: 1.0 X-Mailer: b4 0.11.0-dev-28747 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org In preparation of switching all OF-based GPIO lookups to go through of_find_gpio() let's change it to accept device node as its argument as we do not always have access to device structure. Reviewed-by: Andy Shevchenko Acked-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- drivers/gpio/gpiolib-of.c | 7 +++---- drivers/gpio/gpiolib-of.h | 4 ++-- drivers/gpio/gpiolib.c | 5 +++-- 3 files changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index be9c34cca322..52e4ac0fcaa1 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -623,7 +623,7 @@ static const of_find_gpio_quirk of_find_gpio_quirks[] = { NULL }; -struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, +struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id, unsigned int idx, unsigned long *flags) { char prop_name[32]; /* 32 is max size of property name */ @@ -641,8 +641,7 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, snprintf(prop_name, sizeof(prop_name), "%s", gpio_suffixes[i]); - desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, - &of_flags); + desc = of_get_named_gpiod_flags(np, prop_name, idx, &of_flags); if (!gpiod_not_found(desc)) break; @@ -650,7 +649,7 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, /* Properly named GPIO was not found, try workarounds */ for (q = of_find_gpio_quirks; gpiod_not_found(desc) && *q; q++) - desc = (*q)(dev->of_node, con_id, idx, &of_flags); + desc = (*q)(np, con_id, idx, &of_flags); if (IS_ERR(desc)) return desc; diff --git a/drivers/gpio/gpiolib-of.h b/drivers/gpio/gpiolib-of.h index 1b5df39a952e..cb8b70a2723e 100644 --- a/drivers/gpio/gpiolib-of.h +++ b/drivers/gpio/gpiolib-of.h @@ -16,7 +16,7 @@ struct gpio_desc; struct gpio_device; #ifdef CONFIG_OF_GPIO -struct gpio_desc *of_find_gpio(struct device *dev, +struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id, unsigned int idx, unsigned long *lookupflags); @@ -26,7 +26,7 @@ int of_gpio_get_count(struct device *dev, const char *con_id); bool of_gpio_need_valid_mask(const struct gpio_chip *gc); void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev); #else -static inline struct gpio_desc *of_find_gpio(struct device *dev, +static inline struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id, unsigned int idx, unsigned long *lookupflags) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index e8faedca6b14..c5a80def8be4 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -4070,14 +4070,15 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev, int ret; /* Maybe we have a device name, maybe not */ const char *devname = dev ? dev_name(dev) : "?"; - const struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; + struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); /* Using device tree? */ if (is_of_node(fwnode)) { dev_dbg(dev, "using device tree for GPIO lookup\n"); - desc = of_find_gpio(dev, con_id, idx, &lookupflags); + desc = of_find_gpio(to_of_node(fwnode), + con_id, idx, &lookupflags); } else if (is_acpi_node(fwnode)) { dev_dbg(dev, "using ACPI for GPIO lookup\n"); desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); From patchwork Wed Nov 9 00:26:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 622967 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A3F22C4167B for ; Wed, 9 Nov 2022 00:27:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229870AbiKIA1K (ORCPT ); Tue, 8 Nov 2022 19:27:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229464AbiKIA1D (ORCPT ); Tue, 8 Nov 2022 19:27:03 -0500 Received: from mail-pf1-x430.google.com (mail-pf1-x430.google.com [IPv6:2607:f8b0:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF9D75EFB1; Tue, 8 Nov 2022 16:26:59 -0800 (PST) Received: by mail-pf1-x430.google.com with SMTP id b29so15211817pfp.13; Tue, 08 Nov 2022 16:26:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=GdJFy/Jw06zpP+63ffqxVPckP7PtfLIb1CoKR1TTueA=; b=B6xgDrY0FQj+FeOAhKIAYNhe4CsrKt4yX/MzFScf+l6bg0804fCWBAAmfQPozPsrxp tOWrMYTaexVuozV8NcFDcjvEJ8xIW81CY29hEEZ1iKLqEekUhyc4uwITGo4c+8u5uD4g VlfgdFJ3sxpQO2je1ttQjgWxlZOwupqfl6kBsGLZCgY71LdxGBrN4x5CxsLa7/kcYtBZ Cr+7021m0HzaFzBQcwy4zGBVNOuVDZQll9Md6Kg5sWNV/6IgYrf/xh7UCpOmqGbxpdeY qulG20zUXOnmCG9j64yA49r/FZ0YHMuQg2YTGS4SxWl/2sgkBrUHwnrmaIX6VyuFT3g/ 5Iaw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=GdJFy/Jw06zpP+63ffqxVPckP7PtfLIb1CoKR1TTueA=; b=TciNV4tkobjnuVX+9NuVvGR5JzLUAIjbHCn2WRMnyC65b6PpDOzGAhPm5LDvsG9MfU N/i1Yu6zx5k1nU4aKi6/s6JhefPtFUymhtyfXDh+SkZ5jG1swr2/4Oaz5h5ejn3PHtLM ILdDAzgkqPq30u8ELi35BsdCye3nhjYUBlvJc/T5ZwbcAL+ehEWBX/aICpYSSujv5Ybd nqiOxGb8uEbkkucjiil/TBnsIQBp+JbV2tO7+W63MEBD51dnL64u5fMJHHn4pL4OSgOp adLZEwqtJCZTClFDvHpwo7aUb5FxpB3WPmtDj7+8kXhwSxqhb3GPvfgZIk7ShP40ju4b pICg== X-Gm-Message-State: ANoB5pnuJJeFd/d0UuFRAP08bbkoxf3M6JMmEaagAHceukA9dD8X/I42 cgHv9luSp8xXYuL1ouNlEQk= X-Google-Smtp-Source: AA0mqf6cq77sVAjFrtWY7KsMrtzH87UogLsLJf136+kvmIcfyZBvJliTJdR4lmwpNpW11nBSNFlOzA== X-Received: by 2002:a05:6a00:1689:b0:56e:d7f4:3aca with SMTP id k9-20020a056a00168900b0056ed7f43acamr19140154pfc.55.1667953619205; Tue, 08 Nov 2022 16:26:59 -0800 (PST) Received: from dtor-ws.mtv.corp.google.com ([2620:15c:9d:2:9f46:7242:26:f220]) by smtp.gmail.com with ESMTPSA id i65-20020a626d44000000b0056bd737fdf3sm6907324pfc.123.2022.11.08.16.26.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Nov 2022 16:26:58 -0800 (PST) From: Dmitry Torokhov To: Linus Walleij , Andy Shevchenko , Bartosz Golaszewski Cc: linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/6] gpiolib: acpi: change acpi_find_gpio() to accept firmware node Date: Tue, 8 Nov 2022 16:26:47 -0800 Message-Id: <20221031-gpiolib-swnode-v2-2-81f55af5fa0e@gmail.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog In-Reply-To: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> References: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> MIME-Version: 1.0 X-Mailer: b4 0.11.0-dev-28747 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org In preparation of switching all ACPI-based GPIO lookups to go through acpi_find_gpio() let's change it to accept device node as its argument as we do not always have access to device structure. Reviewed-by: Andy Shevchenko Acked-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- drivers/gpio/gpiolib-acpi.c | 8 ++++++-- drivers/gpio/gpiolib-acpi.h | 4 ++-- drivers/gpio/gpiolib.c | 3 ++- 3 files changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 064ba5150fd4..ccb74e208989 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -906,18 +906,22 @@ static bool acpi_can_fallback_to_crs(struct acpi_device *adev, return con_id == NULL; } -struct gpio_desc *acpi_find_gpio(struct device *dev, +struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int idx, enum gpiod_flags *dflags, unsigned long *lookupflags) { - struct acpi_device *adev = ACPI_COMPANION(dev); + struct acpi_device *adev; struct acpi_gpio_info info; struct gpio_desc *desc; char propname[32]; int i; + adev = to_acpi_device_node(fwnode); + if (!adev) + return ERR_PTR(-ENODEV); + /* Try first from _DSD */ for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { if (con_id) { diff --git a/drivers/gpio/gpiolib-acpi.h b/drivers/gpio/gpiolib-acpi.h index 01e0cb480a00..bd1f9b92ea9e 100644 --- a/drivers/gpio/gpiolib-acpi.h +++ b/drivers/gpio/gpiolib-acpi.h @@ -60,7 +60,7 @@ int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, struct acpi_gpio_info *info); -struct gpio_desc *acpi_find_gpio(struct device *dev, +struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int idx, enum gpiod_flags *dflags, @@ -95,7 +95,7 @@ acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, } static inline struct gpio_desc * -acpi_find_gpio(struct device *dev, const char *con_id, +acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int idx, enum gpiod_flags *dflags, unsigned long *lookupflags) { diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index c5a80def8be4..eebcdaca5e06 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -4081,7 +4081,8 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev, con_id, idx, &lookupflags); } else if (is_acpi_node(fwnode)) { dev_dbg(dev, "using ACPI for GPIO lookup\n"); - desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); + desc = acpi_find_gpio(fwnode, + con_id, idx, &flags, &lookupflags); } /* From patchwork Wed Nov 9 00:26:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 622968 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D4B52C4332F for ; Wed, 9 Nov 2022 00:27:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229777AbiKIA1H (ORCPT ); Tue, 8 Nov 2022 19:27:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229498AbiKIA1D (ORCPT ); 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Tue, 08 Nov 2022 16:27:00 -0800 (PST) From: Dmitry Torokhov To: Linus Walleij , Andy Shevchenko , Bartosz Golaszewski Cc: linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/6] gpiolib: acpi: teach acpi_find_gpio() to handle data-only nodes Date: Tue, 8 Nov 2022 16:26:48 -0800 Message-Id: <20221031-gpiolib-swnode-v2-3-81f55af5fa0e@gmail.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog In-Reply-To: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> References: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> MIME-Version: 1.0 X-Mailer: b4 0.11.0-dev-28747 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org In preparation of switching all ACPI-based GPIO lookups to go through acpi_find_gpio() we need to make sure it can handle data-only ACPI nodes, same as existing acpi_node_get_gpiod(). Reviewed-by: Andy Shevchenko Acked-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- drivers/gpio/gpiolib-acpi.c | 76 +++++++++++++++++++++++++++++---------------- 1 file changed, 50 insertions(+), 26 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index ccb74e208989..d51bf2a3203d 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -864,8 +864,9 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, * function only returns the first. */ static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, - const char *propname, int index, - struct acpi_gpio_info *info) + const char *propname, + int index, + struct acpi_gpio_info *info) { struct acpi_gpio_lookup lookup; int ret; @@ -896,6 +897,44 @@ static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, return ret ? ERR_PTR(ret) : lookup.desc; } +/** + * acpi_get_gpiod_from_data() - get a GPIO descriptor from ACPI data node + * @fwnode: pointer to an ACPI firmware node to get the GPIO information from + * @propname: Property name of the GPIO + * @index: index of GpioIo/GpioInt resource (starting from %0) + * @info: info pointer to fill in (optional) + * + * This function uses the property-based GPIO lookup to get to the GPIO + * resource with the relevant information from a data-only ACPI firmware node + * and uses that to obtain the GPIO descriptor to return. + * + * If the GPIO cannot be translated or there is an error an ERR_PTR is + * returned. + */ +static struct gpio_desc *acpi_get_gpiod_from_data(struct fwnode_handle *fwnode, + const char *propname, + int index, + struct acpi_gpio_info *info) +{ + struct acpi_gpio_lookup lookup; + int ret; + + if (!is_acpi_data_node(fwnode)) + return ERR_PTR(-ENODEV); + + if (!propname) + return ERR_PTR(-EINVAL); + + lookup.index = index; + + ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); + if (ret) + return ERR_PTR(ret); + + ret = acpi_gpio_resource_lookup(&lookup, info); + return ret ? ERR_PTR(ret) : lookup.desc; +} + static bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id) { @@ -912,16 +951,12 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, enum gpiod_flags *dflags, unsigned long *lookupflags) { - struct acpi_device *adev; + struct acpi_device *adev = to_acpi_device_node(fwnode); struct acpi_gpio_info info; struct gpio_desc *desc; char propname[32]; int i; - adev = to_acpi_device_node(fwnode); - if (!adev) - return ERR_PTR(-ENODEV); - /* Try first from _DSD */ for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { if (con_id) { @@ -932,7 +967,12 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, gpio_suffixes[i]); } - desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); + if (adev) + desc = acpi_get_gpiod_by_index(adev, + propname, idx, &info); + else + desc = acpi_get_gpiod_from_data(fwnode, + propname, idx, &info); if (!IS_ERR(desc)) break; if (PTR_ERR(desc) == -EPROBE_DEFER) @@ -941,7 +981,7 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, /* Then from plain _CRS GPIOs */ if (IS_ERR(desc)) { - if (!acpi_can_fallback_to_crs(adev, con_id)) + if (!adev || !acpi_can_fallback_to_crs(adev, con_id)) return ERR_PTR(-ENOENT); desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); @@ -979,29 +1019,13 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, int index, struct acpi_gpio_info *info) { - struct acpi_gpio_lookup lookup; struct acpi_device *adev; - int ret; adev = to_acpi_device_node(fwnode); if (adev) return acpi_get_gpiod_by_index(adev, propname, index, info); - if (!is_acpi_data_node(fwnode)) - return ERR_PTR(-ENODEV); - - if (!propname) - return ERR_PTR(-EINVAL); - - memset(&lookup, 0, sizeof(lookup)); - lookup.index = index; - - ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); - if (ret) - return ERR_PTR(ret); - - ret = acpi_gpio_resource_lookup(&lookup, info); - return ret ? ERR_PTR(ret) : lookup.desc; + return acpi_get_gpiod_from_data(fwnode, propname, index, info); } /** From patchwork Wed Nov 9 00:26:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 623365 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E409FC4321E for ; Wed, 9 Nov 2022 00:27:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229828AbiKIA1I (ORCPT ); Tue, 8 Nov 2022 19:27:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229723AbiKIA1F (ORCPT ); Tue, 8 Nov 2022 19:27:05 -0500 Received: from mail-pl1-x635.google.com (mail-pl1-x635.google.com [IPv6:2607:f8b0:4864:20::635]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0494361746; Tue, 8 Nov 2022 16:27:03 -0800 (PST) Received: by mail-pl1-x635.google.com with SMTP id p12so10131425plq.4; Tue, 08 Nov 2022 16:27:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=2AGc3emho2rw8bHzX4XM873wewr02G0nK1D2GVmf5H0=; b=U/sstLWrT7UYMgcp+CLTpwoGQckvH5ozD2NRowfFIlzaQeP+xJn5gBmsSj/xBrMJvF olaMDsSvah6hZlW4XRXSXEuWdVgIbF4lup8Uba82WZ7M+Qc5NTcSTZujXVC7Dwu/6XaX dwJAEQaRN+qX9s+BuEmHyKegqI7Zq9WuzVLxjvnUuQWjpb8Zws4tKMUXGjW0a7LpLUcr 1F0mpMKCXaByofjWJWSsu3BM1itEUaaBrfBN3GUVKu41WvSO9h3XYm9IKst03JTh4wSN TooZDV1tR63OpyUkJ7epgKyB+04laZTEzARqwaM3cfTY3uM4M9d4/5VT5aH9zP9Zjh9W suTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2AGc3emho2rw8bHzX4XM873wewr02G0nK1D2GVmf5H0=; b=5M8mus3eQhm4boI+ldHGgWd2F+us9cDR1xI419G9NfBttFMCswcoYOOAncjy3zAn/1 d7GmqaV+K2IDk6IAsgMsVUN1OdOvacyMsChWW7TszrMyDF7y8ph7juqD3lXo36buK6i5 V2cBf5EGLQ6t2zldqky2b4o9VJ4LI57GuEcKfBGlvjUlOgzqJKZY3ZCKhZben7I1vHN3 UM5Aw7oZjxi4PPhqzHUGBCDSVXcAHX6Q/BUWOQ16dcMLGnvyhwizn/Omg9zJ48BRU6/4 qYYgF3KPM6QLldkeB5gxM2bfYB9/0xUtKdkav3m0Eu1GOwF7qeoEV8RJZihbaVX4vd9U t9/g== X-Gm-Message-State: ACrzQf3awmotrDR4LyPi6iBRijQ8hQuVRqgMCAEhcT7AOuxcfjYA1N+5 gVTpjIHitPxlALBuQlsNtxU= X-Google-Smtp-Source: AMsMyM6H3ES1AoHyIqSgqZSWMDhRreAEr6eNgCx+UkMndvMaQBh724iQArFBIjWZoOYJDOo72Q+vaA== X-Received: by 2002:a17:90a:8504:b0:212:c1f4:ddf1 with SMTP id l4-20020a17090a850400b00212c1f4ddf1mr60798416pjn.224.1667953623060; Tue, 08 Nov 2022 16:27:03 -0800 (PST) Received: from dtor-ws.mtv.corp.google.com ([2620:15c:9d:2:9f46:7242:26:f220]) by smtp.gmail.com with ESMTPSA id i65-20020a626d44000000b0056bd737fdf3sm6907324pfc.123.2022.11.08.16.27.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Nov 2022 16:27:02 -0800 (PST) From: Dmitry Torokhov To: Linus Walleij , Andy Shevchenko , Bartosz Golaszewski Cc: linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 4/6] gpiolib: acpi: avoid leaking ACPI details into upper gpiolib layers Date: Tue, 8 Nov 2022 16:26:49 -0800 Message-Id: <20221031-gpiolib-swnode-v2-4-81f55af5fa0e@gmail.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog In-Reply-To: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> References: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> MIME-Version: 1.0 X-Mailer: b4 0.11.0-dev-28747 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org There is no need for the generic parts of GPIOLIB to be aware of implementation details of ACPI-bases lookups. Reviewed-by: Andy Shevchenko Acked-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- drivers/gpio/gpiolib-acpi.c | 51 ++++++++++++++++++++++++++++++++++++++------- drivers/gpio/gpiolib-acpi.h | 46 +++------------------------------------- drivers/gpio/gpiolib.c | 8 ++----- 3 files changed, 48 insertions(+), 57 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index d51bf2a3203d..1bc386032ca8 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -89,6 +89,30 @@ struct acpi_gpio_chip { struct list_head deferred_req_irqs_list_entry; }; +/** + * struct acpi_gpio_info - ACPI GPIO specific information + * @adev: reference to ACPI device which consumes GPIO resource + * @flags: GPIO initialization flags + * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo + * @pin_config: pin bias as provided by ACPI + * @polarity: interrupt polarity as provided by ACPI + * @triggering: triggering type as provided by ACPI + * @wake_capable: wake capability as provided by ACPI + * @debounce: debounce timeout as provided by ACPI + * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping + */ +struct acpi_gpio_info { + struct acpi_device *adev; + enum gpiod_flags flags; + bool gpioint; + int pin_config; + int polarity; + int triggering; + bool wake_capable; + unsigned int debounce; + unsigned int quirks; +}; + /* * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a @@ -670,8 +694,8 @@ __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) return ret; } -int -acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info) +static int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, + struct acpi_gpio_info *info) { struct device *dev = &info->adev->dev; enum gpiod_flags old = *flags; @@ -690,8 +714,8 @@ acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *inf return ret; } -int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, - struct acpi_gpio_info *info) +static int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, + struct acpi_gpio_info *info) { switch (info->pin_config) { case ACPI_PIN_CONFIG_PULLUP: @@ -1005,7 +1029,8 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, * @fwnode: pointer to an ACPI firmware node to get the GPIO information from * @propname: Property name of the GPIO * @index: index of GpioIo/GpioInt resource (starting from %0) - * @info: info pointer to fill in (optional) + * @lflags: bitmask of gpio_lookup_flags GPIO_* values + * @dflags: gpiod initialization flags * * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it. * Otherwise (i.e. it is a data-only non-device object), use the property-based @@ -1017,15 +1042,25 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, */ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, int index, - struct acpi_gpio_info *info) + unsigned long *lflags, + enum gpiod_flags *dflags) { + struct acpi_gpio_info info; struct acpi_device *adev; + struct gpio_desc *desc; adev = to_acpi_device_node(fwnode); if (adev) - return acpi_get_gpiod_by_index(adev, propname, index, info); + desc = acpi_get_gpiod_by_index(adev, propname, index, &info); + else + desc = acpi_get_gpiod_from_data(fwnode, propname, index, &info); - return acpi_get_gpiod_from_data(fwnode, propname, index, info); + if (!IS_ERR(desc)) { + acpi_gpio_update_gpiod_flags(dflags, &info); + acpi_gpio_update_gpiod_lookup_flags(lflags, &info); + } + + return desc; } /** diff --git a/drivers/gpio/gpiolib-acpi.h b/drivers/gpio/gpiolib-acpi.h index bd1f9b92ea9e..8880615327ac 100644 --- a/drivers/gpio/gpiolib-acpi.h +++ b/drivers/gpio/gpiolib-acpi.h @@ -22,30 +22,6 @@ struct gpio_chip; struct gpio_desc; struct gpio_device; -/** - * struct acpi_gpio_info - ACPI GPIO specific information - * @adev: reference to ACPI device which consumes GPIO resource - * @flags: GPIO initialization flags - * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo - * @pin_config: pin bias as provided by ACPI - * @polarity: interrupt polarity as provided by ACPI - * @triggering: triggering type as provided by ACPI - * @wake_capable: wake capability as provided by ACPI - * @debounce: debounce timeout as provided by ACPI - * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping - */ -struct acpi_gpio_info { - struct acpi_device *adev; - enum gpiod_flags flags; - bool gpioint; - int pin_config; - int polarity; - int triggering; - bool wake_capable; - unsigned int debounce; - unsigned int quirks; -}; - #ifdef CONFIG_ACPI void acpi_gpiochip_add(struct gpio_chip *chip); void acpi_gpiochip_remove(struct gpio_chip *chip); @@ -55,11 +31,6 @@ void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev); void acpi_gpiochip_request_interrupts(struct gpio_chip *chip); void acpi_gpiochip_free_interrupts(struct gpio_chip *chip); -int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, - struct acpi_gpio_info *info); -int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, - struct acpi_gpio_info *info); - struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int idx, @@ -67,7 +38,8 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, unsigned long *lookupflags); struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, int index, - struct acpi_gpio_info *info); + unsigned long *lflags, + enum gpiod_flags *dflags); int acpi_gpio_count(struct device *dev, const char *con_id); #else @@ -82,18 +54,6 @@ acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { } static inline void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { } -static inline int -acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info) -{ - return 0; -} -static inline int -acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, - struct acpi_gpio_info *info) -{ - return 0; -} - static inline struct gpio_desc * acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int idx, enum gpiod_flags *dflags, @@ -103,7 +63,7 @@ acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, } static inline struct gpio_desc * acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, - int index, struct acpi_gpio_info *info) + int index, unsigned long *lflags, enum gpiod_flags *dflags) { return ERR_PTR(-ENXIO); } diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index eebcdaca5e06..f0a7a59ac630 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -3838,14 +3838,10 @@ static struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, label); return desc; } else if (is_acpi_node(fwnode)) { - struct acpi_gpio_info info; - - desc = acpi_node_get_gpiod(fwnode, propname, index, &info); + desc = acpi_node_get_gpiod(fwnode, propname, index, + &lflags, &dflags); if (IS_ERR(desc)) return desc; - - acpi_gpio_update_gpiod_flags(&dflags, &info); - acpi_gpio_update_gpiod_lookup_flags(&lflags, &info); } else { return ERR_PTR(-EINVAL); } From patchwork Wed Nov 9 00:26:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 623364 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 949F9C433FE for ; Wed, 9 Nov 2022 00:27:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229900AbiKIA1b (ORCPT ); Tue, 8 Nov 2022 19:27:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229754AbiKIA1H (ORCPT ); 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Tue, 08 Nov 2022 16:27:04 -0800 (PST) From: Dmitry Torokhov To: Linus Walleij , Andy Shevchenko , Bartosz Golaszewski Cc: linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 5/6] gpiolib: consolidate GPIO lookups Date: Tue, 8 Nov 2022 16:26:50 -0800 Message-Id: <20221031-gpiolib-swnode-v2-5-81f55af5fa0e@gmail.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog In-Reply-To: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> References: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> MIME-Version: 1.0 X-Mailer: b4 0.11.0-dev-28747 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Ensure that all paths to obtain/look up GPIOD from generic consumer-visible APIs go through the new gpiod_find_and_request() helper, so that we can easily extend it with support for new firmware mechanisms. The only exception is OF-specific [devm_]gpiod_get_from_of_node() API that is still being used by a couple of drivers and will be removed as soon as patches converting them to use generic fwnode/device APIs are accepted. Acked-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- drivers/gpio/gpiolib-acpi.c | 39 --------- drivers/gpio/gpiolib-acpi.h | 10 --- drivers/gpio/gpiolib.c | 207 +++++++++++++++++--------------------------- 3 files changed, 81 insertions(+), 175 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 1bc386032ca8..bed0380c5136 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -1024,45 +1024,6 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, return desc; } -/** - * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources - * @fwnode: pointer to an ACPI firmware node to get the GPIO information from - * @propname: Property name of the GPIO - * @index: index of GpioIo/GpioInt resource (starting from %0) - * @lflags: bitmask of gpio_lookup_flags GPIO_* values - * @dflags: gpiod initialization flags - * - * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it. - * Otherwise (i.e. it is a data-only non-device object), use the property-based - * GPIO lookup to get to the GPIO resource with the relevant information and use - * that to obtain the GPIO descriptor to return. - * - * If the GPIO cannot be translated or there is an error an ERR_PTR is - * returned. - */ -struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, - const char *propname, int index, - unsigned long *lflags, - enum gpiod_flags *dflags) -{ - struct acpi_gpio_info info; - struct acpi_device *adev; - struct gpio_desc *desc; - - adev = to_acpi_device_node(fwnode); - if (adev) - desc = acpi_get_gpiod_by_index(adev, propname, index, &info); - else - desc = acpi_get_gpiod_from_data(fwnode, propname, index, &info); - - if (!IS_ERR(desc)) { - acpi_gpio_update_gpiod_flags(dflags, &info); - acpi_gpio_update_gpiod_lookup_flags(lflags, &info); - } - - return desc; -} - /** * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ number * @adev: pointer to a ACPI device to get IRQ from diff --git a/drivers/gpio/gpiolib-acpi.h b/drivers/gpio/gpiolib-acpi.h index 8880615327ac..9475f99a9694 100644 --- a/drivers/gpio/gpiolib-acpi.h +++ b/drivers/gpio/gpiolib-acpi.h @@ -36,10 +36,6 @@ struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, unsigned int idx, enum gpiod_flags *dflags, unsigned long *lookupflags); -struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, - const char *propname, int index, - unsigned long *lflags, - enum gpiod_flags *dflags); int acpi_gpio_count(struct device *dev, const char *con_id); #else @@ -61,12 +57,6 @@ acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, { return ERR_PTR(-ENOENT); } -static inline struct gpio_desc * -acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, - int index, unsigned long *lflags, enum gpiod_flags *dflags) -{ - return ERR_PTR(-ENXIO); -} static inline int acpi_gpio_count(struct device *dev, const char *con_id) { return -ENODEV; diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index f0a7a59ac630..c33ffdd47667 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -3801,58 +3801,89 @@ static int platform_gpio_count(struct device *dev, const char *con_id) return count; } -/** - * fwnode_get_named_gpiod - obtain a GPIO from firmware node - * @fwnode: handle of the firmware node - * @propname: name of the firmware property representing the GPIO - * @index: index of the GPIO to obtain for the consumer - * @dflags: GPIO initialization flags - * @label: label to attach to the requested GPIO - * - * This function can be used for drivers that get their configuration - * from opaque firmware. - * - * The function properly finds the corresponding GPIO using whatever is the - * underlying firmware interface and then makes sure that the GPIO - * descriptor is requested before it is returned to the caller. - * - * Returns: - * On successful request the GPIO pin is configured in accordance with - * provided @dflags. - * - * In case of error an ERR_PTR() is returned. - */ -static struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, - const char *propname, int index, - enum gpiod_flags dflags, - const char *label) +static struct gpio_desc *gpiod_find_by_fwnode(struct fwnode_handle *fwnode, + struct device *consumer, + const char *con_id, + unsigned int idx, + enum gpiod_flags *flags, + unsigned long *lookupflags) { - unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; - struct gpio_desc *desc = ERR_PTR(-ENODEV); - int ret; + struct gpio_desc *desc; + dev_dbg(consumer, "GPIO lookup for consumer %s in node '%pfw'\n", + con_id, fwnode); + + /* Using device tree? */ if (is_of_node(fwnode)) { - desc = gpiod_get_from_of_node(to_of_node(fwnode), - propname, index, - dflags, - label); - return desc; + dev_dbg(consumer, "using device tree for GPIO lookup\n"); + desc = of_find_gpio(to_of_node(fwnode), + con_id, idx, lookupflags); } else if (is_acpi_node(fwnode)) { - desc = acpi_node_get_gpiod(fwnode, propname, index, - &lflags, &dflags); - if (IS_ERR(desc)) - return desc; + dev_dbg(consumer, "using ACPI for GPIO lookup\n"); + desc = acpi_find_gpio(fwnode, con_id, idx, flags, lookupflags); } else { - return ERR_PTR(-EINVAL); + desc = ERR_PTR(-ENOENT); } - /* Currently only ACPI takes this path */ + return desc; +} + +static struct gpio_desc *gpiod_find_and_request(struct device *consumer, + struct fwnode_handle *fwnode, + const char *con_id, + unsigned int idx, + enum gpiod_flags flags, + const char *label, + bool platform_lookup_allowed) +{ + struct gpio_desc *desc = ERR_PTR(-ENOENT); + unsigned long lookupflags; + int ret; + + if (!IS_ERR_OR_NULL(fwnode)) + desc = gpiod_find_by_fwnode(fwnode, consumer, con_id, idx, + &flags, &lookupflags); + + if (gpiod_not_found(desc) && platform_lookup_allowed) { + /* + * Either we are not using DT or ACPI, or their lookup did not + * return a result. In that case, use platform lookup as a + * fallback. + */ + dev_dbg(consumer, "using lookup tables for GPIO lookup\n"); + desc = gpiod_find(consumer, con_id, idx, &lookupflags); + } + + if (IS_ERR(desc)) { + dev_dbg(consumer, "No GPIO consumer %s found\n", con_id); + return desc; + } + + /* + * If a connection label was passed use that, else attempt to use + * the device name as label + */ ret = gpiod_request(desc, label); - if (ret) - return ERR_PTR(ret); + if (ret) { + if (!(ret == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) + return ERR_PTR(ret); + + /* + * This happens when there are several consumers for + * the same GPIO line: we just return here without + * further initialization. It is a bit of a hack. + * This is necessary to support fixed regulators. + * + * FIXME: Make this more sane and safe. + */ + dev_info(consumer, + "nonexclusive access to GPIO for %s\n", con_id); + return desc; + } - ret = gpiod_configure_flags(desc, propname, lflags, dflags); + ret = gpiod_configure_flags(desc, con_id, lookupflags, flags); if (ret < 0) { + dev_dbg(consumer, "setup of GPIO %s failed\n", con_id); gpiod_put(desc); return ERR_PTR(ret); } @@ -3885,29 +3916,13 @@ static struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, * In case of error an ERR_PTR() is returned. */ struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode, - const char *con_id, int index, + const char *con_id, + int index, enum gpiod_flags flags, const char *label) { - struct gpio_desc *desc; - char prop_name[32]; /* 32 is max size of property name */ - unsigned int i; - - for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { - if (con_id) - snprintf(prop_name, sizeof(prop_name), "%s-%s", - con_id, gpio_suffixes[i]); - else - snprintf(prop_name, sizeof(prop_name), "%s", - gpio_suffixes[i]); - - desc = fwnode_get_named_gpiod(fwnode, prop_name, index, flags, - label); - if (!gpiod_not_found(desc)) - break; - } - - return desc; + return gpiod_find_and_request(NULL, fwnode, con_id, index, flags, label, + false); } EXPORT_SYMBOL_GPL(fwnode_gpiod_get_index); @@ -4061,72 +4076,12 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev, unsigned int idx, enum gpiod_flags flags) { - unsigned long lookupflags = GPIO_LOOKUP_FLAGS_DEFAULT; - struct gpio_desc *desc = NULL; - int ret; - /* Maybe we have a device name, maybe not */ - const char *devname = dev ? dev_name(dev) : "?"; struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; + const char *devname = dev ? dev_name(dev) : "?"; + const char *label = con_id ?: devname; - dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); - - /* Using device tree? */ - if (is_of_node(fwnode)) { - dev_dbg(dev, "using device tree for GPIO lookup\n"); - desc = of_find_gpio(to_of_node(fwnode), - con_id, idx, &lookupflags); - } else if (is_acpi_node(fwnode)) { - dev_dbg(dev, "using ACPI for GPIO lookup\n"); - desc = acpi_find_gpio(fwnode, - con_id, idx, &flags, &lookupflags); - } - - /* - * Either we are not using DT or ACPI, or their lookup did not return - * a result. In that case, use platform lookup as a fallback. - */ - if (!desc || gpiod_not_found(desc)) { - dev_dbg(dev, "using lookup tables for GPIO lookup\n"); - desc = gpiod_find(dev, con_id, idx, &lookupflags); - } - - if (IS_ERR(desc)) { - dev_dbg(dev, "No GPIO consumer %s found\n", con_id); - return desc; - } - - /* - * If a connection label was passed use that, else attempt to use - * the device name as label - */ - ret = gpiod_request(desc, con_id ?: devname); - if (ret) { - if (!(ret == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) - return ERR_PTR(ret); - - /* - * This happens when there are several consumers for - * the same GPIO line: we just return here without - * further initialization. It is a bit of a hack. - * This is necessary to support fixed regulators. - * - * FIXME: Make this more sane and safe. - */ - dev_info(dev, "nonexclusive access to GPIO for %s\n", con_id ?: devname); - return desc; - } - - ret = gpiod_configure_flags(desc, con_id, lookupflags, flags); - if (ret < 0) { - dev_dbg(dev, "setup of GPIO %s failed\n", con_id); - gpiod_put(desc); - return ERR_PTR(ret); - } - - blocking_notifier_call_chain(&desc->gdev->notifier, - GPIOLINE_CHANGED_REQUESTED, desc); - - return desc; + return gpiod_find_and_request(dev, fwnode, con_id, idx, flags, label, + true); } EXPORT_SYMBOL_GPL(gpiod_get_index); From patchwork Wed Nov 9 00:26:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 622966 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C50AAC4332F for ; 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Tue, 08 Nov 2022 16:27:05 -0800 (PST) From: Dmitry Torokhov To: Linus Walleij , Andy Shevchenko , Bartosz Golaszewski Cc: linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 6/6] gpiolib: add support for software nodes Date: Tue, 8 Nov 2022 16:26:51 -0800 Message-Id: <20221031-gpiolib-swnode-v2-6-81f55af5fa0e@gmail.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog In-Reply-To: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> References: <20221031-gpiolib-swnode-v2-0-81f55af5fa0e@gmail.com> MIME-Version: 1.0 X-Mailer: b4 0.11.0-dev-28747 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Now that static device properties understand notion of child nodes and references, let's teach gpiolib to handle them: - GPIOs are represented as a references to software nodes representing gpiochip - references must have 2 arguments - GPIO number within the chip and GPIO flags (GPIO_ACTIVE_LOW/GPIO_ACTIVE_HIGH, etc) - a new PROPERTY_ENTRY_GPIO() macro is supplied to ensure the above - name of the software node representing gpiochip must match label of the gpiochip, as we use it to locate gpiochip structure at runtime The following illustrates use of software nodes to describe a "System" button that is currently specified via use of gpio_keys_platform_data in arch/mips/alchemy/board-mtx1.c. It follows bindings specified in Documentation/devicetree/bindings/input/gpio-keys.yaml. static const struct software_node mxt1_gpiochip2_node = { .name = "alchemy-gpio2", }; static const struct property_entry mtx1_gpio_button_props[] = { PROPERTY_ENTRY_U32("linux,code", BTN_0), PROPERTY_ENTRY_STRING("label", "System button"), PROPERTY_ENTRY_GPIO("gpios", &mxt1_gpiochip2_node, 7, GPIO_ACTIVE_LOW), { } }; Similarly, arch/arm/mach-tegra/board-paz00.c can be converted to: static const struct software_node tegra_gpiochip_node = { .name = "tegra-gpio", }; static struct property_entry wifi_rfkill_prop[] __initdata = { PROPERTY_ENTRY_STRING("name", "wifi_rfkill"), PROPERTY_ENTRY_STRING("type", "wlan"), PROPERTY_ENTRY_GPIO("reset-gpios", &tegra_gpiochip_node, 25, GPIO_ACTIVE_HIGH); PROPERTY_ENTRY_GPIO("shutdown-gpios", &tegra_gpiochip_node, 85, GPIO_ACTIVE_HIGH); { }, }; static struct platform_device wifi_rfkill_device = { .name = "rfkill_gpio", .id = -1, }; ... software_node_register(&tegra_gpiochip_node); device_create_managed_software_node(&wifi_rfkill_device.dev, wifi_rfkill_prop, NULL); Acked-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- drivers/gpio/Makefile | 1 + drivers/gpio/gpiolib-swnode.c | 128 ++++++++++++++++++++++++++++++++++++++++++ drivers/gpio/gpiolib-swnode.h | 14 +++++ drivers/gpio/gpiolib.c | 12 +++- include/linux/gpio/property.h | 11 ++++ 5 files changed, 164 insertions(+), 2 deletions(-) diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 8629e9eaf79e..010587025fc8 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_OF_GPIO) += gpiolib-of.o obj-$(CONFIG_GPIO_CDEV) += gpiolib-cdev.o obj-$(CONFIG_GPIO_SYSFS) += gpiolib-sysfs.o obj-$(CONFIG_GPIO_ACPI) += gpiolib-acpi.o +obj-$(CONFIG_GPIOLIB) += gpiolib-swnode.o # Device drivers. Generally keep list sorted alphabetically obj-$(CONFIG_GPIO_REGMAP) += gpio-regmap.o diff --git a/drivers/gpio/gpiolib-swnode.c b/drivers/gpio/gpiolib-swnode.c new file mode 100644 index 000000000000..4cf41234bfc6 --- /dev/null +++ b/drivers/gpio/gpiolib-swnode.c @@ -0,0 +1,128 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Software Node helpers for the GPIO API + * + * Copyright 2022 Google LLC + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include "gpiolib.h" +#include "gpiolib-swnode.h" + +static void swnode_format_propname(const char *con_id, char *propname, + size_t max_size) +{ + /* + * Note we do not need to try both -gpios and -gpio suffixes, + * as, unlike OF and ACPI, we can fix software nodes to conform + * to the proper binding. + */ + if (con_id) + snprintf(propname, max_size, "%s-gpios", con_id); + else + strscpy(propname, "gpios", max_size); +} + +static int swnode_gpiochip_match_name(struct gpio_chip *chip, void *data) +{ + return !strcmp(chip->label, data); +} + +static struct gpio_chip *swnode_get_chip(struct fwnode_handle *fwnode) +{ + const struct software_node *chip_node; + struct gpio_chip *chip; + + chip_node = to_software_node(fwnode); + if (!chip_node || !chip_node->name) + return ERR_PTR(-EINVAL); + + chip = gpiochip_find((void *)chip_node->name, + swnode_gpiochip_match_name); + if (!chip) + return ERR_PTR(-EPROBE_DEFER); + + return chip; +} + +struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode, + const char *con_id, unsigned int idx, + unsigned long *flags) +{ + const struct software_node *swnode; + struct fwnode_reference_args args; + struct gpio_chip *chip; + struct gpio_desc *desc; + char propname[32]; /* 32 is max size of property name */ + int error; + + swnode = to_software_node(fwnode); + if (!swnode) + return ERR_PTR(-EINVAL); + + swnode_format_propname(con_id, propname, sizeof(propname)); + + /* + * We expect all swnode-described GPIOs have GPIO number and + * polarity arguments, hence nargs is set to 2. + */ + error = fwnode_property_get_reference_args(fwnode, propname, NULL, + 2, idx, &args); + if (error) { + pr_debug("%s: can't parse '%s' property of node '%pfwP[%d]'\n", + __func__, propname, fwnode, idx); + return ERR_PTR(error); + } + + chip = swnode_get_chip(args.fwnode); + fwnode_handle_put(args.fwnode); + if (IS_ERR(chip)) + return ERR_CAST(chip); + + desc = gpiochip_get_desc(chip, args.args[0]); + *flags = args.args[1]; /* We expect native GPIO flags */ + + pr_debug("%s: parsed '%s' property of node '%pfwP[%d]' - status (%d)\n", + __func__, propname, fwnode, idx, PTR_ERR_OR_ZERO(desc)); + + return desc; +} + +/** + * swnode_gpio_count - count the GPIOs associated with a device / function + * @fwnode: firmware node of the GPIO consumer, can be %NULL for + * system-global GPIOs + * @con_id: function within the GPIO consumer + * + * Return: + * The number of GPIOs associated with a device / function or %-ENOENT, + * if no GPIO has been assigned to the requested function. + */ +int swnode_gpio_count(struct fwnode_handle *fwnode, const char *con_id) +{ + struct fwnode_reference_args args; + char propname[32]; + int count; + + swnode_format_propname(con_id, propname, sizeof(propname)); + + /* + * This is not very efficient, but GPIO lists usually have only + * 1 or 2 entries. + */ + count = 0; + while (fwnode_property_get_reference_args(fwnode, propname, NULL, + 0, count, &args) == 0) { + fwnode_handle_put(args.fwnode); + count++; + } + + return count ?: -ENOENT; +} diff --git a/drivers/gpio/gpiolib-swnode.h b/drivers/gpio/gpiolib-swnode.h new file mode 100644 index 000000000000..4e07be56ed9f --- /dev/null +++ b/drivers/gpio/gpiolib-swnode.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef GPIOLIB_SWNODE_H +#define GPIOLIB_SWNODE_H + +struct fwnode_handle; +struct gpio_desc; + +struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode, + const char *con_id, unsigned int idx, + unsigned long *flags); +int swnode_gpio_count(struct fwnode_handle *fwnode, const char *con_id); + +#endif /* GPIOLIB_SWNODE_H */ diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index c33ffdd47667..bf5c072206da 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -26,6 +26,7 @@ #include "gpiolib.h" #include "gpiolib-of.h" #include "gpiolib-acpi.h" +#include "gpiolib-swnode.h" #include "gpiolib-cdev.h" #include "gpiolib-sysfs.h" @@ -3821,6 +3822,9 @@ static struct gpio_desc *gpiod_find_by_fwnode(struct fwnode_handle *fwnode, } else if (is_acpi_node(fwnode)) { dev_dbg(consumer, "using ACPI for GPIO lookup\n"); desc = acpi_find_gpio(fwnode, con_id, idx, flags, lookupflags); + } else if (is_software_node(fwnode)) { + dev_dbg(consumer, "using software node for GPIO lookup\n"); + desc = swnode_find_gpio(fwnode, con_id, idx, lookupflags); } else { desc = ERR_PTR(-ENOENT); } @@ -3934,13 +3938,17 @@ EXPORT_SYMBOL_GPL(fwnode_gpiod_get_index); */ int gpiod_count(struct device *dev, const char *con_id) { - const struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; - int count = -ENOENT; + struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; + int count; if (is_of_node(fwnode)) count = of_gpio_get_count(dev, con_id); else if (is_acpi_node(fwnode)) count = acpi_gpio_count(dev, con_id); + else if (is_software_node(fwnode)) + count = swnode_gpio_count(fwnode, con_id); + else + count = -ENOENT; if (count < 0) count = platform_gpio_count(dev, con_id); diff --git a/include/linux/gpio/property.h b/include/linux/gpio/property.h new file mode 100644 index 000000000000..f76a46469f66 --- /dev/null +++ b/include/linux/gpio/property.h @@ -0,0 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0+ +#ifndef __LINUX_GPIO_PROPERTY_H +#define __LINUX_GPIO_PROPERTY_H + +#include +#include + +#define PROPERTY_ENTRY_GPIO(_name_, _chip_node_, _idx_, _flags_) \ + PROPERTY_ENTRY_REF(_name_, _chip_node_, _idx_, _flags_) + +#endif /* __LINUX_GPIO_PROPERTY_H */