From patchwork Thu Apr 8 20:52:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sander Vanheule X-Patchwork-Id: 418433 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98A3CC433B4 for ; Thu, 8 Apr 2021 20:52:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 74B4361177 for ; Thu, 8 Apr 2021 20:52:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232320AbhDHUw7 (ORCPT ); Thu, 8 Apr 2021 16:52:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232005AbhDHUw7 (ORCPT ); Thu, 8 Apr 2021 16:52:59 -0400 Received: from polaris.svanheule.net (polaris.svanheule.net [IPv6:2a00:c98:2060:a004:1::200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4122FC061760 for ; Thu, 8 Apr 2021 13:52:47 -0700 (PDT) Received: from terra.local.svanheule.net (unknown [IPv6:2a02:a03f:eaff:9f01:6fea:16c6:2e86:c69]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: sander@svanheule.net) by polaris.svanheule.net (Postfix) with ESMTPSA id 45EFD1ECD3A; Thu, 8 Apr 2021 22:52:45 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=svanheule.net; s=mail1707; t=1617915165; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1HNkVs+fE0nRqWoxJ2FcJAWlbxwCmExLGCCRESK3LDM=; b=BQOidEbcOT/4k0hOP/F1nFpEt48nXyqtyQ4ej2uJ+cG+/VNcb3EdZ6j11OXT4LaC1YfjAN EbE38ByMxwkiNfqctu5NTiakv6EEki6OCdSDHNlpNqOccZvP1sCh7ZxLAF8/ZU42JzWxEw QsWsyRmw3BoyUilV0TMRAfmHA8sgoRAC+4e2jScAza6fDMAtET2ykgdOVFgzeepZq7r9wY /en+FRDQhL0opFMzgHlCQqOom7rclq79NV2Z/LZULoXPe1lpsTD/rw4wkqVMZzMVMni0Mw QymMJ4gVbcMRu9WcMu1Lz+T4LWycPeSUz+k1DP9ocVAKexoV9J410wgRcX/vNA== From: Sander Vanheule To: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org, Mark Brown , Greg Kroah-Hartman , "Rafael J . Wysocki" Cc: bert@biot.com, Sander Vanheule Subject: [RFC PATCH 1/2] regmap: add miim bus support Date: Thu, 8 Apr 2021 22:52:34 +0200 Message-Id: <489e8a2d22dc8a5aaa3600289669c3bf0a15ba19.1617914861.git.sander@svanheule.net> X-Mailer: git-send-email 2.30.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Basic support for MIIM bus access. Support only includes clause-22 register access, with 5-bit addresses, and 16-bit wide registers. Signed-off-by: Sander Vanheule --- drivers/base/regmap/Kconfig | 6 +++- drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-miim.c | 58 +++++++++++++++++++++++++++++++ include/linux/regmap.h | 36 +++++++++++++++++++ 4 files changed, 100 insertions(+), 1 deletion(-) create mode 100644 drivers/base/regmap/regmap-miim.c diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig index 50b1e2d06a25..5bcd9789284e 100644 --- a/drivers/base/regmap/Kconfig +++ b/drivers/base/regmap/Kconfig @@ -4,7 +4,7 @@ # subsystems should select the appropriate symbols. config REGMAP - default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_SOUNDWIRE || REGMAP_SOUNDWIRE_MBQ || REGMAP_SCCB || REGMAP_I3C || REGMAP_SPI_AVMM) + default y if (REGMAP_I2C || REGMAP_SPI || REGMAP_SPMI || REGMAP_W1 || REGMAP_AC97 || REGMAP_MMIO || REGMAP_IRQ || REGMAP_SOUNDWIRE || REGMAP_SOUNDWIRE_MBQ || REGMAP_SCCB || REGMAP_I3C || REGMAP_SPI_AVMM || REGMAP_MIIM) select IRQ_DOMAIN if REGMAP_IRQ bool @@ -36,6 +36,10 @@ config REGMAP_W1 tristate depends on W1 +config REGMAP_MIIM + tristate + depends on MDIO_DEVICE + config REGMAP_MMIO tristate diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile index 33f63adb5b3d..d80920bd42ce 100644 --- a/drivers/base/regmap/Makefile +++ b/drivers/base/regmap/Makefile @@ -19,3 +19,4 @@ obj-$(CONFIG_REGMAP_SOUNDWIRE_MBQ) += regmap-sdw-mbq.o obj-$(CONFIG_REGMAP_SCCB) += regmap-sccb.o obj-$(CONFIG_REGMAP_I3C) += regmap-i3c.o obj-$(CONFIG_REGMAP_SPI_AVMM) += regmap-spi-avmm.o +obj-$(CONFIG_REGMAP_MIIM) += regmap-miim.o diff --git a/drivers/base/regmap/regmap-miim.c b/drivers/base/regmap/regmap-miim.c new file mode 100644 index 000000000000..a560d2910417 --- /dev/null +++ b/drivers/base/regmap/regmap-miim.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include + +static int regmap_miim_read(void *context, unsigned int reg, unsigned int *val) +{ + struct mdio_device *mdio_dev = context; + int ret; + + ret = mdiobus_read(mdio_dev->bus, mdio_dev->addr, reg); + *val = ret & 0xffff; + + return ret < 0 ? ret : 0; +} + +static int regmap_miim_write(void *context, unsigned int reg, unsigned int val) +{ + struct mdio_device *mdio_dev = context; + + return mdiobus_write(mdio_dev->bus, mdio_dev->addr, reg, val); +} + +static const struct regmap_bus regmap_miim_bus = { + .reg_write = regmap_miim_write, + .reg_read = regmap_miim_read, +}; + +struct regmap *__regmap_init_miim(struct mdio_device *mdio_dev, + const struct regmap_config *config, struct lock_class_key *lock_key, + const char *lock_name) +{ + if (config->reg_bits != 5 || config->val_bits != 16) + return ERR_PTR(-ENOTSUPP); + + return __regmap_init(&mdio_dev->dev, ®map_miim_bus, mdio_dev, config, + lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__regmap_init_miim); + +struct regmap *__devm_regmap_init_miim(struct mdio_device *mdio_dev, + const struct regmap_config *config, struct lock_class_key *lock_key, + const char *lock_name) +{ + if (config->reg_bits != 5 || config->val_bits != 16) + return ERR_PTR(-ENOTSUPP); + + return __devm_regmap_init(&mdio_dev->dev, ®map_miim_bus, mdio_dev, + config, lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__devm_regmap_init_miim); + +MODULE_AUTHOR("Sander Vanheule "); +MODULE_DESCRIPTION("Regmap MIIM Module"); +MODULE_LICENSE("GPL v2"); + diff --git a/include/linux/regmap.h b/include/linux/regmap.h index 2cc4ecd36298..f25630f793c3 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -27,6 +27,7 @@ struct device_node; struct i2c_client; struct i3c_device; struct irq_domain; +struct mdio_device; struct slim_device; struct spi_device; struct spmi_device; @@ -538,6 +539,10 @@ struct regmap *__regmap_init_i2c(struct i2c_client *i2c, const struct regmap_config *config, struct lock_class_key *lock_key, const char *lock_name); +struct regmap *__regmap_init_miim(struct mdio_device *mdio_dev, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name); struct regmap *__regmap_init_sccb(struct i2c_client *i2c, const struct regmap_config *config, struct lock_class_key *lock_key, @@ -594,6 +599,10 @@ struct regmap *__devm_regmap_init_i2c(struct i2c_client *i2c, const struct regmap_config *config, struct lock_class_key *lock_key, const char *lock_name); +struct regmap *__devm_regmap_init_miim(struct mdio_device *mdio_dev, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name); struct regmap *__devm_regmap_init_sccb(struct i2c_client *i2c, const struct regmap_config *config, struct lock_class_key *lock_key, @@ -697,6 +706,19 @@ int regmap_attach_dev(struct device *dev, struct regmap *map, __regmap_lockdep_wrapper(__regmap_init_i2c, #config, \ i2c, config) +/** + * regmap_init_miim() - Initialise register map + * + * @mdio_dev: Device that will be interacted with + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer to + * a struct regmap. + */ +#define regmap_init_miim(mdio_dev, config) \ + __regmap_lockdep_wrapper(__regmap_init_miim, #config, \ + mdio_dev, config) + /** * regmap_init_sccb() - Initialise register map * @@ -888,6 +910,20 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg); __regmap_lockdep_wrapper(__devm_regmap_init_i2c, #config, \ i2c, config) +/** + * devm_regmap_init_miim() - Initialise managed register map + * + * @mdio_dev: Device that will be interacted with + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer + * to a struct regmap. The regmap will be automatically freed by the + * device management code. + */ +#define devm_regmap_init_miim(mdio_dev, config) \ + __regmap_lockdep_wrapper(__devm_regmap_init_miim, #config, \ + mdio_dev, config) + /** * devm_regmap_init_sccb() - Initialise managed register map *