From patchwork Fri Oct 14 17:54:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 615324 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 8BEC1C4332F for ; Fri, 14 Oct 2022 17:55:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230308AbiJNRzS (ORCPT ); Fri, 14 Oct 2022 13:55:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230305AbiJNRzL (ORCPT ); Fri, 14 Oct 2022 13:55:11 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 74AF42FFD1; Fri, 14 Oct 2022 10:54:53 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id y8so5545233pfp.13; Fri, 14 Oct 2022 10:54:53 -0700 (PDT) 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=DDr9juWg3u7tqOqaJOOvY3u67HoyFj37SYo8BbenwWk=; b=K7/WyOZWPb1Rs6hBURYIqASCfJWT2Ypv8TwWdxwKsLl76h3ZM8LE9cDiE5sYUXXgED ypzOhURY5d09mWMjlYXc+SII8+wsHvMD0gUy/765T0ggM48TQeRCi2+CiNUwNMaSdFku noZF0GhcUdMc3nnH5TB3bLmnSRcg5QqRVQNtPJi2ZTTQhL0YHsV+H0wnGfopeE+nioAb UGmP8/p89sY7HGR6q8RjE92cv/+mU4BSXLJ2ODAfJG8ZlKLXp+F7ni24WTCFu3JqhHn8 PKB83IW8xGp0+2jZiGDFfWo0PHN41mnnCau1ep5hAiJ0GbxMfviZTW0IF77tiTyxu4Ye U92g== 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=DDr9juWg3u7tqOqaJOOvY3u67HoyFj37SYo8BbenwWk=; b=bOZndGjv47XomIkimGH8gTD5Pw9kyrc3tx1orQC2uo0ZTtkN+FuiZL/MB1BuxNOMO4 N1dVQlc8a2MHbAB35KG1UG++rPk9+m50HOlHRDHR+tagTeWmp65WalgGu/GO4bjafSOn gy0W0ACokyjlxrWJvhveesWeVMZEKdCcyFP3KTQQi0oM7rk6sxAhwKLyvwdud+mUEPfm H4LzBXdM7XAhE2Rrm5p/EqjJsgt6hGFOhnjhARsLEs4TqxODOhg+6CzN4CRHgKWGyFcA PphgAkGtlfHG2JmsiTEMNJd/dZBxtm6HljaAOPot4c99YkgEBLOAE31PUbWcsnQSLSJ7 evSQ== X-Gm-Message-State: ACrzQf2H7U9so8F6asWw1kBhC3Wpx34NVn0nhVVkjUFy5G3rT8qqpYoR MCp+A2JxPggsy51TxoJWozA= X-Google-Smtp-Source: AMsMyM66Ubh6jeHbtdegqbobjzrs9/DILurRSxW9pjZiIKKLcEoBNq3fQp7n84VpA3gI2fuXewHT1A== X-Received: by 2002:a63:1d22:0:b0:439:3e7c:8af7 with SMTP id d34-20020a631d22000000b004393e7c8af7mr5605142pgd.78.1665770092947; Fri, 14 Oct 2022 10:54:52 -0700 (PDT) Received: from dtor-ws.mtv.corp.google.com ([2620:15c:9d:2:da06:5604:594f:f6af]) by smtp.gmail.com with ESMTPSA id jj19-20020a170903049300b0017f7819732dsm2011780plb.77.2022.10.14.10.54.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Oct 2022 10:54:52 -0700 (PDT) From: Dmitry Torokhov To: Bartosz Golaszewski , Linus Walleij Cc: linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Alexander Stein , linux-kernel@vger.kernel.org, Daniel Thompson , Andy Shevchenko , linux-gpio@vger.kernel.org Subject: [PATCH v2 9/9] gpiolib: of: add a quirk for reset line polarity for Himax LCDs Date: Fri, 14 Oct 2022 10:54:33 -0700 Message-Id: <20221011-gpiolib-quirks-v2-9-73cb7176fd94@gmail.com> X-Mailer: git-send-email 2.38.0.413.g74048e4d9e-goog In-Reply-To: <20221011-gpiolib-quirks-v2-0-73cb7176fd94@gmail.com> References: <20221011-gpiolib-quirks-v2-0-73cb7176fd94@gmail.com> MIME-Version: 1.0 X-Mailer: b4 0.11.0-dev-5166b Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Existing DTS that use legacy (non-standard) property name for the reset line "gpios-reset" also specify incorrect polarity (0 which maps to "active high"). Add a quirk to force polarity to "active low" so that once driver is converted to gpiod API that pays attention to line polarity it will work properly. Signed-off-by: Dmitry Torokhov --- drivers/gpio/gpiolib-of.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 805222a2e6bc..26d57465fec9 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -152,11 +152,47 @@ static void of_gpio_quirk_polarity(const struct device_node *np, } } +/* + * This quirk does static polarity overrides in cases where existing + * DTS specified incorrect polarity. + */ +static void of_gpio_try_fixup_polarity(const struct device_node *np, + const char *propname, + enum of_gpio_flags *flags) +{ + static const struct { + const char *compatible; + const char *propname; + bool active_high; + } gpios[] = { +#if !IS_ENABLED(CONFIG_LCD_HX8357) + /* + * Himax LCD controllers used incorrectly named + * "gpios-reset" property and also specified wrong + * polarity. + */ + { "himax,hx8357", "gpios-reset", false }, + { "himax,hx8369", "gpios-reset", false }, +#endif + }; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(gpios); i++) { + if (of_device_is_compatible(np, gpios[i].compatible) && + !strcmp(propname, gpios[i].propname)) { + of_gpio_quirk_polarity(np, gpios[i].active_high, flags); + break; + } + } +} + static void of_gpio_flags_quirks(const struct device_node *np, const char *propname, enum of_gpio_flags *flags, int index) { + of_gpio_try_fixup_polarity(np, propname, flags); + /* * Some GPIO fixed regulator quirks. * Note that active low is the default.