From patchwork Fri Jan 12 16:36:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 762230 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 38DE276917 for ; Fri, 12 Jan 2024 16:36:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="oEc42AHT" Received: by mail-wm1-f44.google.com with SMTP id 5b1f17b1804b1-40e67e90d4cso5997715e9.1 for ; Fri, 12 Jan 2024 08:36:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1705077382; x=1705682182; darn=vger.kernel.org; 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=68a0GULzTNp5I10XTHNXdWuvNz9Mn+A/t6I9BSr+hho=; b=oEc42AHT8EjnqGyNsHIEdPwI5UY+qJyG4TujOSQYO9iLtjkLVT/o19AQhSWsbsHG9b bAyBYE9Xc7bY68ntAgubzH5FPHFkvZOwSI0IpvLJQgf1MMOoA6tn6cFxm7hcXf6HPEql TNBcPNH7ZP6X16XPN/0ntzwuBOvlmlSE5HumdRu5PZnP3SFxYZ4z7xx7dB/WxwKhKtnm V9sP9apzqwUYxjwtzfXZdMWqfNVLe7kh5gzUJyjyt05bOsuP7EZpdt3YLuenI7GjJ9Ll 4jCWlbULj93ZMdo2Y9TXlqLU91lZ7CsJOROX/kWLKbN1iegLvkkW4k5ocp7lxuunwuno 7lkw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705077382; x=1705682182; 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=68a0GULzTNp5I10XTHNXdWuvNz9Mn+A/t6I9BSr+hho=; b=iVnRCSW0Xb63Az1DEYnkvEgreH7RQe0LKABWfioaR+cgI7gt7kGnrYNe56gjonFhA9 ID+8Ztmo66oB8IVFoDBg6dpo0nLDUC9tQzbDjR/2z0Smz54bJY3vcRVGC9CHnf7XqyQN eCJaoxgqzm6vWYZGDBZhvJDkpstOWJh/OfsdKeIwp4TgdMl/+2Yhe979dRqzKho2j2cr K/y1pNBu5h0QtISbHPjYSdlvMgub+ax1W/r199WbDMxAeN+yfY8RuD5LbWjro3zQc/kK 3IQdDqF98bZkAn6v3kvppa1w8+F1dvk+tuLqMSCA9EJOOUhXnoQYkrxdidBYrcerYeIe okJg== X-Gm-Message-State: AOJu0YwmCnqPZzSzIu2+eEA6wlM4mrMWXu+YO91kj0sF7Be2rDJ/ct0m j677onxdKg2RsIMbpbb/DLZUgufTRUTwhg== X-Google-Smtp-Source: AGHT+IExac0ZAkIrMJ702KpNYy5NUU3oncL7IAEWsPpn/98wL/uT9ZpKdi2Yd4czP8vgDvhHBxbJ1w== X-Received: by 2002:a05:600c:31a9:b0:40d:725a:994b with SMTP id s41-20020a05600c31a900b0040d725a994bmr659058wmp.174.1705077382570; Fri, 12 Jan 2024 08:36:22 -0800 (PST) Received: from krzk-bin.. ([178.197.223.112]) by smtp.gmail.com with ESMTPSA id bd16-20020a05600c1f1000b0040e5a93ae53sm6573195wmb.22.2024.01.12.08.36.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jan 2024 08:36:22 -0800 (PST) From: Krzysztof Kozlowski To: Bjorn Andersson , Konrad Dybcio , Srinivas Kandagatla , Banajit Goswami , Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Peter Rosin , Philipp Zabel , Jaroslav Kysela , Takashi Iwai , linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-sound@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org Cc: Krzysztof Kozlowski , Bartosz Golaszewski , Chris Packham , Sean Anderson Subject: [PATCH v3 1/5] reset: gpio: Add GPIO-based reset controller Date: Fri, 12 Jan 2024 17:36:04 +0100 Message-Id: <20240112163608.528453-2-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> References: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a simple driver to control GPIO-based resets using the reset controller API for the cases when the GPIOs are shared and reset should be coordinated. The driver is expected to be used by reset core framework for ad-hoc reset controllers. Cc: Bartosz Golaszewski Cc: Chris Packham Cc: Sean Anderson Signed-off-by: Krzysztof Kozlowski Reviewed-by: Bartosz Golaszewski --- MAINTAINERS | 5 ++ drivers/reset/Kconfig | 9 +++ drivers/reset/Makefile | 1 + drivers/reset/reset-gpio.c | 121 +++++++++++++++++++++++++++++++++++++ 4 files changed, 136 insertions(+) create mode 100644 drivers/reset/reset-gpio.c diff --git a/MAINTAINERS b/MAINTAINERS index 7fe27cd60e1b..a0fbd4814bc7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8866,6 +8866,11 @@ F: Documentation/i2c/muxes/i2c-mux-gpio.rst F: drivers/i2c/muxes/i2c-mux-gpio.c F: include/linux/platform_data/i2c-mux-gpio.h +GENERIC GPIO RESET DRIVER +M: Krzysztof Kozlowski +S: Maintained +F: drivers/reset/reset-gpio.c + GENERIC HDLC (WAN) DRIVERS M: Krzysztof Halasa S: Maintained diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index ccd59ddd7610..bb1b5a326eb7 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -66,6 +66,15 @@ config RESET_BRCMSTB_RESCAL This enables the RESCAL reset controller for SATA, PCIe0, or PCIe1 on BCM7216. +config RESET_GPIO + tristate "GPIO reset controller" + help + This enables a generic reset controller for resets attached via + GPIOs. Typically for OF platforms this driver expects "reset-gpios" + property. + + If compiled as module, it will be called reset-gpio. + config RESET_HSDK bool "Synopsys HSDK Reset Driver" depends on HAS_IOMEM diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 8270da8a4baa..fd8b49fa46fc 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o +obj-$(CONFIG_RESET_GPIO) += reset-gpio.o obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o obj-$(CONFIG_RESET_IMX7) += reset-imx7.o obj-$(CONFIG_RESET_INTEL_GW) += reset-intel-gw.o diff --git a/drivers/reset/reset-gpio.c b/drivers/reset/reset-gpio.c new file mode 100644 index 000000000000..0fe482740f1b --- /dev/null +++ b/drivers/reset/reset-gpio.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include + +struct reset_gpio_priv { + struct reset_controller_dev rc; + struct gpio_desc *reset; +}; + +static inline struct reset_gpio_priv +*rc_to_reset_gpio(struct reset_controller_dev *rc) +{ + return container_of(rc, struct reset_gpio_priv, rc); +} + +static int reset_gpio_assert(struct reset_controller_dev *rc, unsigned long id) +{ + struct reset_gpio_priv *priv = rc_to_reset_gpio(rc); + + gpiod_set_value_cansleep(priv->reset, 1); + + return 0; +} + +static int reset_gpio_deassert(struct reset_controller_dev *rc, + unsigned long id) +{ + struct reset_gpio_priv *priv = rc_to_reset_gpio(rc); + + gpiod_set_value_cansleep(priv->reset, 0); + + return 0; +} + +static int reset_gpio_status(struct reset_controller_dev *rc, unsigned long id) +{ + struct reset_gpio_priv *priv = rc_to_reset_gpio(rc); + + return gpiod_get_value_cansleep(priv->reset); +} + +static const struct reset_control_ops reset_gpio_ops = { + .assert = reset_gpio_assert, + .deassert = reset_gpio_deassert, + .status = reset_gpio_status, +}; + +static int reset_gpio_of_xlate(struct reset_controller_dev *rcdev, + const struct of_phandle_args *reset_spec) +{ + return reset_spec->args[0]; +} + +static void reset_gpio_of_node_put(void *data) +{ + of_node_put(data); +} + +static int reset_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct of_phandle_args *platdata = dev_get_platdata(dev); + struct reset_gpio_priv *priv; + int ret; + + if (!platdata) + return -EINVAL; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + platform_set_drvdata(pdev, &priv->rc); + + /* Relies on GPIO_LOOKUP */ + priv->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(priv->reset)) + return dev_err_probe(dev, PTR_ERR(priv->reset), + "Could not get reset gpios\n"); + + priv->rc.ops = &reset_gpio_ops; + priv->rc.owner = THIS_MODULE; + priv->rc.dev = dev; + priv->rc.of_args = platdata; + priv->rc.of_node = of_node_get(platdata->np); + ret = devm_add_action_or_reset(dev, reset_gpio_of_node_put, + priv->rc.of_node); + if (ret) + return ret; + + /* Cells to match GPIO specifier, but it's not really used */ + priv->rc.of_reset_n_cells = 2; + priv->rc.of_xlate = reset_gpio_of_xlate; + priv->rc.nr_resets = 1; + + return devm_reset_controller_register(dev, &priv->rc); +} + +static const struct platform_device_id reset_gpio_ids[] = { + { .name = "reset-gpio", }, + {} +}; +MODULE_DEVICE_TABLE(platform, reset_gpio_ids); + +static struct platform_driver reset_gpio_driver = { + .probe = reset_gpio_probe, + .id_table = reset_gpio_ids, + .driver = { + .name = "reset-gpio", + }, +}; +module_platform_driver(reset_gpio_driver); + +MODULE_AUTHOR("Krzysztof Kozlowski "); +MODULE_DESCRIPTION("Generic GPIO reset driver"); +MODULE_LICENSE("GPL"); From patchwork Fri Jan 12 16:36:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 762528 Received: from mail-wm1-f49.google.com (mail-wm1-f49.google.com [209.85.128.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3F7FE7763D for ; 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([178.197.223.112]) by smtp.gmail.com with ESMTPSA id bd16-20020a05600c1f1000b0040e5a93ae53sm6573195wmb.22.2024.01.12.08.36.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jan 2024 08:36:24 -0800 (PST) From: Krzysztof Kozlowski To: Bjorn Andersson , Konrad Dybcio , Srinivas Kandagatla , Banajit Goswami , Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Peter Rosin , Philipp Zabel , Jaroslav Kysela , Takashi Iwai , linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-sound@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org Cc: Krzysztof Kozlowski , Bartosz Golaszewski , Chris Packham , Sean Anderson Subject: [PATCH v3 2/5] reset: Instantiate reset GPIO controller for shared reset-gpios Date: Fri, 12 Jan 2024 17:36:05 +0100 Message-Id: <20240112163608.528453-3-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> References: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Devices sharing a reset GPIO could use the reset framework for coordinated handling of that shared GPIO line. We have several cases of such needs, at least for Devicetree-based platforms. If Devicetree-based device requests a reset line, while "resets" Devicetree property is missing but there is a "reset-gpios" one, instantiate a new "reset-gpio" platform device which will handle such reset line. This allows seamless handling of such shared reset-gpios without need of changing Devicetree binding [1]. To avoid creating multiple "reset-gpio" platform devices, store the Devicetree "reset-gpios" GPIO specifiers used for new devices on a linked list. Later such Devicetree GPIO specifier (phandle to GPIO controller, GPIO number and GPIO flags) is used to check if reset controller for given GPIO was already registered. If two devices have conflicting "reset-gpios" property, e.g. with different ACTIVE_xxx flags, this would allow to spawn two separate "reset-gpio" devices, where the second would fail probing on busy GPIO request. Link: https://lore.kernel.org/all/YXi5CUCEi7YmNxXM@robh.at.kernel.org/ [1] Cc: Bartosz Golaszewski Cc: Chris Packham Cc: Sean Anderson Signed-off-by: Krzysztof Kozlowski --- drivers/reset/core.c | 227 +++++++++++++++++++++++++++++-- include/linux/reset-controller.h | 4 + 2 files changed, 217 insertions(+), 14 deletions(-) diff --git a/drivers/reset/core.c b/drivers/reset/core.c index 4d5a78d3c085..86e33a703ad2 100644 --- a/drivers/reset/core.c +++ b/drivers/reset/core.c @@ -10,9 +10,13 @@ #include #include #include +#include +#include +#include #include #include #include +#include #include #include #include @@ -23,6 +27,11 @@ static LIST_HEAD(reset_controller_list); static DEFINE_MUTEX(reset_lookup_mutex); static LIST_HEAD(reset_lookup_list); +/* Protects reset_gpio_lookup_list */ +static DEFINE_MUTEX(reset_gpio_lookup_mutex); +static LIST_HEAD(reset_gpio_lookup_list); +static DEFINE_IDA(reset_gpio_ida); + /** * struct reset_control - a reset control * @rcdev: a pointer to the reset controller device @@ -63,6 +72,16 @@ struct reset_control_array { struct reset_control *rstc[] __counted_by(num_rstcs); }; +/** + * struct reset_gpio_lookup - lookup key for ad-hoc created reset-gpio devices + * @of_args: phandle to the reset controller with all the args like GPIO number + * @list: list entry for the reset_gpio_lookup_list + */ +struct reset_gpio_lookup { + struct of_phandle_args of_args; + struct list_head list; +}; + static const char *rcdev_name(struct reset_controller_dev *rcdev) { if (rcdev->dev) @@ -813,13 +832,183 @@ static void __reset_control_put_internal(struct reset_control *rstc) kref_put(&rstc->refcnt, __reset_control_release); } +static bool __reset_gpios_args_match(const struct of_phandle_args *a1, + const struct of_phandle_args *a2) +{ + unsigned int i; + + if (!a2) + return false; + + if (a1->args_count != a2->args_count) + return false; + + for (i = 0; i < a1->args_count; i++) + if (a1->args[i] != a2->args[i]) + return false; + + return true; +} + +static int __reset_add_reset_gpio_lookup(int id, struct device_node *np, + unsigned int gpio, + unsigned int of_flags) +{ + struct gpiod_lookup_table *lookup __free(kfree) = NULL; + struct gpio_device *gdev __free(gpio_device_put) = NULL; + char *label __free(kfree) = NULL; + unsigned int lookup_flags; + + /* + * Later we map GPIO flags between OF and Linux, however not all + * constants from include/dt-bindings/gpio/gpio.h and + * include/linux/gpio/machine.h match each other. + */ + if (of_flags > GPIO_ACTIVE_LOW) { + pr_err("reset-gpio code does not support GPIO flags %u for GPIO %u\n", + of_flags, gpio); + return -EINVAL; + } + + gdev = gpio_device_find_by_fwnode(of_fwnode_handle(np)); + if (!gdev) + return -EPROBE_DEFER; + + label = kstrdup(gpio_device_get_label(gdev), GFP_KERNEL); + if (!label) + return -EINVAL; + + /* Size: one lookup entry plus sentinel */ + lookup = kzalloc(struct_size(lookup, table, 2), GFP_KERNEL); + if (!lookup) + return -ENOMEM; + + lookup->dev_id = kasprintf(GFP_KERNEL, "reset-gpio.%d", id); + if (!lookup->dev_id) + return -ENOMEM; + + lookup_flags = GPIO_PERSISTENT; + lookup_flags |= of_flags & GPIO_ACTIVE_LOW; + lookup->table[0] = GPIO_LOOKUP(no_free_ptr(label), gpio, "reset", + lookup_flags); + + gpiod_add_lookup_table(no_free_ptr(lookup)); + + return 0; +} + +/* + * @reset_args: phandle to the GPIO provider with all the args like GPIO number + */ +static int __reset_add_reset_gpio_device(const struct of_phandle_args *args) +{ + struct reset_gpio_lookup *rgpio_dev; + struct platform_device *pdev; + int id, ret; + + /* + * Registering reset-gpio device might cause immediate + * bind, resulting in its probe() registering new reset controller thus + * taking reset_list_mutex lock via reset_controller_register(). + */ + lockdep_assert_not_held(&reset_list_mutex); + + mutex_lock(&reset_gpio_lookup_mutex); + + list_for_each_entry(rgpio_dev, &reset_gpio_lookup_list, list) { + if (args->np == rgpio_dev->of_args.np) { + if (__reset_gpios_args_match(args, &rgpio_dev->of_args)) + goto out; /* Already on the list, done */ + } + } + + id = ida_alloc(&reset_gpio_ida, GFP_KERNEL); + if (id < 0) { + ret = id; + goto err_unlock; + } + + /* + * Not freed in normal path, persisent subsystem data (which is assumed + * also in the reset-gpio driver). + */ + rgpio_dev = kzalloc(sizeof(*rgpio_dev), GFP_KERNEL); + if (!rgpio_dev) { + ret = -ENOMEM; + goto err_ida_free; + } + + ret = __reset_add_reset_gpio_lookup(id, args->np, args->args[0], + args->args[1]); + if (ret < 0) + goto err_kfree; + + rgpio_dev->of_args = *args; + /* + * We keep the device_node reference, but of_args.np is put at the end + * of __of_reset_control_get(), so get it one more time. + * Hold reference as long as rgpio_dev memory is valid. + */ + of_node_get(rgpio_dev->of_args.np); + pdev = platform_device_register_data(NULL, "reset-gpio", id, + &rgpio_dev->of_args, + sizeof(rgpio_dev->of_args)); + ret = PTR_ERR_OR_ZERO(pdev); + if (ret) + goto err_put; + + list_add(&rgpio_dev->list, &reset_gpio_lookup_list); + +out: + mutex_unlock(&reset_gpio_lookup_mutex); + + return 0; + +err_put: + of_node_put(rgpio_dev->of_args.np); +err_kfree: + kfree(rgpio_dev); +err_ida_free: + ida_free(&reset_gpio_ida, id); +err_unlock: + mutex_unlock(&reset_gpio_lookup_mutex); + + return ret; +} + +static struct reset_controller_dev *__reset_find_rcdev(const struct of_phandle_args *args, + bool gpio_fallback) +{ + struct reset_controller_dev *r, *rcdev; + + lockdep_assert_held(&reset_list_mutex); + + rcdev = NULL; + list_for_each_entry(r, &reset_controller_list, list) { + if (args->np == r->of_node) { + if (gpio_fallback) { + if (__reset_gpios_args_match(args, r->of_args)) { + rcdev = r; + break; + } + } else { + rcdev = r; + break; + } + } + } + + return rcdev; +} + struct reset_control * __of_reset_control_get(struct device_node *node, const char *id, int index, bool shared, bool optional, bool acquired) { + struct of_phandle_args args = {0}; + bool gpio_fallback = false; struct reset_control *rstc; - struct reset_controller_dev *r, *rcdev; - struct of_phandle_args args; + struct reset_controller_dev *rcdev; int rstc_id; int ret; @@ -839,39 +1028,49 @@ __of_reset_control_get(struct device_node *node, const char *id, int index, index, &args); if (ret == -EINVAL) return ERR_PTR(ret); - if (ret) - return optional ? NULL : ERR_PTR(ret); + if (ret) { + /* + * There can be only one reset-gpio for regular devices, so + * don't bother with GPIO index. + */ + ret = of_parse_phandle_with_args(node, "reset-gpios", "#gpio-cells", + 0, &args); + if (ret) + return optional ? NULL : ERR_PTR(ret); - mutex_lock(&reset_list_mutex); - rcdev = NULL; - list_for_each_entry(r, &reset_controller_list, list) { - if (args.np == r->of_node) { - rcdev = r; - break; + gpio_fallback = true; + + ret = __reset_add_reset_gpio_device(&args); + if (ret) { + rstc = ERR_PTR(ret); + goto out_put; } } + mutex_lock(&reset_list_mutex); + rcdev = __reset_find_rcdev(&args, gpio_fallback); if (!rcdev) { rstc = ERR_PTR(-EPROBE_DEFER); - goto out; + goto out_unlock; } if (WARN_ON(args.args_count != rcdev->of_reset_n_cells)) { rstc = ERR_PTR(-EINVAL); - goto out; + goto out_unlock; } rstc_id = rcdev->of_xlate(rcdev, &args); if (rstc_id < 0) { rstc = ERR_PTR(rstc_id); - goto out; + goto out_unlock; } /* reset_list_mutex also protects the rcdev's reset_control list */ rstc = __reset_control_get_internal(rcdev, rstc_id, shared, acquired); -out: +out_unlock: mutex_unlock(&reset_list_mutex); +out_put: of_node_put(args.np); return rstc; diff --git a/include/linux/reset-controller.h b/include/linux/reset-controller.h index 0fa4f60e1186..e064473215de 100644 --- a/include/linux/reset-controller.h +++ b/include/linux/reset-controller.h @@ -61,6 +61,9 @@ struct reset_control_lookup { * @dev: corresponding driver model device struct * @of_node: corresponding device tree node as phandle target * @of_reset_n_cells: number of cells in reset line specifiers + * TODO: of_args have of_node, so we have here duplication + * @of_args: for reset-gpios controllers: corresponding phandle args with GPIO + * number complementing of_node * @of_xlate: translation function to translate from specifier as found in the * device tree to id as given to the reset control ops, defaults * to :c:func:`of_reset_simple_xlate`. @@ -74,6 +77,7 @@ struct reset_controller_dev { struct device *dev; struct device_node *of_node; int of_reset_n_cells; + const struct of_phandle_args *of_args; int (*of_xlate)(struct reset_controller_dev *rcdev, const struct of_phandle_args *reset_spec); unsigned int nr_resets; From patchwork Fri Jan 12 16:36:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 762229 Received: from mail-wm1-f52.google.com (mail-wm1-f52.google.com [209.85.128.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D46F177653 for ; Fri, 12 Jan 2024 16:36:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="s05yJW4L" Received: by mail-wm1-f52.google.com with SMTP id 5b1f17b1804b1-40e68ca8b45so5028475e9.0 for ; Fri, 12 Jan 2024 08:36:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1705077386; x=1705682186; darn=vger.kernel.org; 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=jT3J/E5ihwUzRJFy9hQ6iVDhNFb12f1LhdaU7OTuQXY=; b=s05yJW4LVxTTdr1T+ybkziivMzscUXlfoSb/PSt/1uy+0UC2WWnuXaWSZZWMQ8YaKy Pgc45rcT5YcwB6w/uTouIyP9BD/ZqsEi1+77/rjT7hiS/9Um3k513ygGI4oKOZ0ro5jN Mn+8vuaUK9RSLsdXG8dPyHLD3pIkp2p4GlIZTd4yjTW7Kzydvt6Q2CdVKYSViHupnNV3 hhe3ri2xRiEXIY7JEQ6/Dck74lP7nZ93HwYhgnyDPkMVXw0lNGb9mQMWnnTuqT6pAKDc gqgoRDEuIu+rcvr9nKQCEKhpWhRXDOUgh8wYpcHOl4W4mYXsb38ElX5GZWO06tMFsJ+u uyUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705077386; x=1705682186; 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=jT3J/E5ihwUzRJFy9hQ6iVDhNFb12f1LhdaU7OTuQXY=; b=T+tSM4UPe+hofWiAeWoewAP1hwClgyk/UxtDb5piUmrWVWllMWpvlB54RMwvV7dY2p NQ/0O36nudAnnJCxqFU5bFs+KL4pqOHBcw+0G59aNtWB9u2FXctLSZnX7rVOuc3TBXCu 3rcmm+b5ip0PgQIOXdmwW7kxZEXNXQHoDQ97cPRSGz2e5/TX5skI7TvwHW6fPV/a4NMe VZu4oDhpz9TB6aS6MhD4g33z5qen4+1Jc9iJCM7BknxgjjwpKEQzL095G7im7o2f9l7m DkoAWCumFvGiPriKFtdKqyqb7gn+GpACqvgPtlTuo2Ta0/BU924/AkhInjT2FSGcaUXL s+Fw== X-Gm-Message-State: AOJu0YxCBfKk1IdP49+7I3u3aGv8mPgjygf0AZyS0/+mUHCFLLTXJLHJ LnkOUwF/v8EAfDTtBORHnLAZanDr+MOOYA== X-Google-Smtp-Source: AGHT+IFlMaVngyy4fcefe3Rw09Fi3QjRs3VS/a1z2djmGMgnedmibuNznMaNjRrf8VGdpC8UT7hL8w== X-Received: by 2002:a05:600c:4505:b0:40e:5534:f6fb with SMTP id t5-20020a05600c450500b0040e5534f6fbmr1019053wmo.165.1705077386295; Fri, 12 Jan 2024 08:36:26 -0800 (PST) Received: from krzk-bin.. ([178.197.223.112]) by smtp.gmail.com with ESMTPSA id bd16-20020a05600c1f1000b0040e5a93ae53sm6573195wmb.22.2024.01.12.08.36.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jan 2024 08:36:25 -0800 (PST) From: Krzysztof Kozlowski To: Bjorn Andersson , Konrad Dybcio , Srinivas Kandagatla , Banajit Goswami , Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Peter Rosin , Philipp Zabel , Jaroslav Kysela , Takashi Iwai , linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-sound@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org Cc: Krzysztof Kozlowski , Bartosz Golaszewski , Sean Anderson Subject: [PATCH v3 3/5] ASoC: dt-bindings: qcom,wsa8840: Add reset-gpios for shared line Date: Fri, 12 Jan 2024 17:36:06 +0100 Message-Id: <20240112163608.528453-4-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> References: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On newer Qualcomm platforms, like X1E80100-CRD, the WSA884x speakers share SD_N GPIOs between two speakers, thus a coordinated assertion is needed. Linux supports handling shared GPIO lines through "reset-gpios" property, thus allow specifying either powerdown or reset GPIOs (these are the same). Cc: Bartosz Golaszewski Cc: Sean Anderson Signed-off-by: Krzysztof Kozlowski Acked-by: Rob Herring --- If previous patches are fine, then this commit is independent and could be taken via ASoC. --- .../devicetree/bindings/sound/qcom,wsa8840.yaml | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/sound/qcom,wsa8840.yaml b/Documentation/devicetree/bindings/sound/qcom,wsa8840.yaml index d717017b0fdb..22798d22d981 100644 --- a/Documentation/devicetree/bindings/sound/qcom,wsa8840.yaml +++ b/Documentation/devicetree/bindings/sound/qcom,wsa8840.yaml @@ -28,6 +28,10 @@ properties: description: Powerdown/Shutdown line to use (pin SD_N) maxItems: 1 + reset-gpios: + description: Powerdown/Shutdown line to use (pin SD_N) + maxItems: 1 + '#sound-dai-cells': const: 0 @@ -37,11 +41,16 @@ properties: required: - compatible - reg - - powerdown-gpios - '#sound-dai-cells' - vdd-1p8-supply - vdd-io-supply +oneOf: + - required: + - powerdown-gpios + - required: + - reset-gpios + unevaluatedProperties: false examples: From patchwork Fri Jan 12 16:36:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 762527 Received: from mail-wm1-f54.google.com (mail-wm1-f54.google.com [209.85.128.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AFFDC77F1F for ; Fri, 12 Jan 2024 16:36:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="crFy3OhX" Received: by mail-wm1-f54.google.com with SMTP id 5b1f17b1804b1-40d6b4e2945so76957385e9.0 for ; Fri, 12 Jan 2024 08:36:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1705077388; x=1705682188; darn=vger.kernel.org; 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=qJ0gjfKMOfp9CH0Fl1AfdBLtnAI1t5WhWrFWLERW/vA=; b=crFy3OhX9eZtbss3gYEfpxA4SPcDBc2AGE5zY0Z4ap2j4Amtc9vH+ZJ2wwyrQ+y0fc sD2hwMPhVoZpQf0207k7tJJeugRSKYcJs6IcLTaCgF44CF38rZVSjyA8RG2HR68HPpNG uR3z9RIIw9ylGg+QB5RLNh17hnTT4UP7HGINuezoII0pAwISkhf7HDFr4oTxrFHGAsYz 0E/ZONyYbgctJKUS8dmCeRi+Xl1OrutehtQf+rWfR1gQEB3CaYZGfH+1sqIxzsJgMgeb sdqKv6nLX28pmyNqhyXS7oFGwOj5cXLvDFpV0Nvz0o0tekNwqhVVDW01r7XkDYtY0nRV nHRw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705077388; x=1705682188; 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=qJ0gjfKMOfp9CH0Fl1AfdBLtnAI1t5WhWrFWLERW/vA=; b=i+lO9x8h+XRDTCq/IFSJ5Q//7wOZOgxn3YFZOSKyShfHD2mok8TJIwi+dvQ6Vtjwki 5SQceSQNKlf7mcpB9HBDWBCz34lODMsm13e3L3eiWpOz4qkxCVmnOPqVlkXnkaY/HUpE 01ti/+g+KAacTCQ3B04AfWtwzk/wKk/prjS3VZPn3JFc3vTxMpxO+w4u1YsWeMNyRL0E fWB8zb6sOSldZSTc6muqlQnU7Op2cnejG750dct7De+3z69eryGKyLuoQcphNB145jRd 6yLyVS5p0bvxQBd8YXuUGZ6LVnxxjDeIDHUxnUu0q7JZ2UNWdhejDR9ZunxJFKwcogeN 8SBw== X-Gm-Message-State: AOJu0YxGm+EzjrvwtJopSG2xnEskAUQ1XrAUtCvkIGTXYujndHHxhuip E99ggwkNbtMrPFhf9wpG6i/iyP5183LEqg== X-Google-Smtp-Source: AGHT+IHqSRTaG8OlbWITLxykNt1QDvTPNgIn1oIQ8+MR5KDmR5gzGGorwJEW8jwyARkRMNpClMX7MA== X-Received: by 2002:a05:600c:181b:b0:40e:437c:7db2 with SMTP id n27-20020a05600c181b00b0040e437c7db2mr665698wmp.211.1705077387970; Fri, 12 Jan 2024 08:36:27 -0800 (PST) Received: from krzk-bin.. ([178.197.223.112]) by smtp.gmail.com with ESMTPSA id bd16-20020a05600c1f1000b0040e5a93ae53sm6573195wmb.22.2024.01.12.08.36.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jan 2024 08:36:27 -0800 (PST) From: Krzysztof Kozlowski To: Bjorn Andersson , Konrad Dybcio , Srinivas Kandagatla , Banajit Goswami , Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Peter Rosin , Philipp Zabel , Jaroslav Kysela , Takashi Iwai , linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-sound@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org Cc: Krzysztof Kozlowski , Bartosz Golaszewski , Sean Anderson Subject: [PATCH v3 4/5] ASoC: codecs: wsa884x: Allow sharing reset GPIO Date: Fri, 12 Jan 2024 17:36:07 +0100 Message-Id: <20240112163608.528453-5-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> References: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On some boards with multiple WSA8840/WSA8845 speakers, the reset (shutdown) GPIO is shared between two speakers. Use the reset controller framework and its "reset-gpio" driver to handle this case. This allows bring-up and proper handling of all WSA884x speakers on X1E80100-CRD board. Cc: Bartosz Golaszewski Cc: Sean Anderson Signed-off-by: Krzysztof Kozlowski --- If previous patches are fine, then this commit is independent and could be taken via ASoC. --- sound/soc/codecs/wsa884x.c | 53 +++++++++++++++++++++++++++++++------- 1 file changed, 43 insertions(+), 10 deletions(-) diff --git a/sound/soc/codecs/wsa884x.c b/sound/soc/codecs/wsa884x.c index f2653df84e4a..a9767ef0e39d 100644 --- a/sound/soc/codecs/wsa884x.c +++ b/sound/soc/codecs/wsa884x.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -699,6 +700,7 @@ struct wsa884x_priv { struct sdw_stream_runtime *sruntime; struct sdw_port_config port_config[WSA884X_MAX_SWR_PORTS]; struct gpio_desc *sd_n; + struct reset_control *sd_reset; bool port_prepared[WSA884X_MAX_SWR_PORTS]; bool port_enable[WSA884X_MAX_SWR_PORTS]; unsigned int variant; @@ -1799,9 +1801,22 @@ static struct snd_soc_dai_driver wsa884x_dais[] = { }, }; -static void wsa884x_gpio_powerdown(void *data) +static void wsa884x_reset_powerdown(void *data) { - gpiod_direction_output(data, 1); + struct wsa884x_priv *wsa884x = data; + + if (wsa884x->sd_reset) + reset_control_assert(wsa884x->sd_reset); + else + gpiod_direction_output(wsa884x->sd_n, 1); +} + +static void wsa884x_reset_deassert(struct wsa884x_priv *wsa884x) +{ + if (wsa884x->sd_reset) + reset_control_deassert(wsa884x->sd_reset); + else + gpiod_direction_output(wsa884x->sd_n, 0); } static void wsa884x_regulator_disable(void *data) @@ -1809,6 +1824,27 @@ static void wsa884x_regulator_disable(void *data) regulator_bulk_disable(WSA884X_SUPPLIES_NUM, data); } +static int wsa884x_get_reset(struct device *dev, struct wsa884x_priv *wsa884x) +{ + wsa884x->sd_reset = devm_reset_control_get_optional_shared(dev, NULL); + if (IS_ERR(wsa884x->sd_reset)) + return dev_err_probe(dev, PTR_ERR(wsa884x->sd_reset), + "Failed to get reset\n"); + else if (wsa884x->sd_reset) + return 0; + /* + * else: NULL, so use the backwards compatible way for powerdown-gpios, + * which does not handle sharing GPIO properly. + */ + wsa884x->sd_n = devm_gpiod_get_optional(dev, "powerdown", + GPIOD_OUT_HIGH); + if (IS_ERR(wsa884x->sd_n)) + return dev_err_probe(dev, PTR_ERR(wsa884x->sd_n), + "Shutdown Control GPIO not found\n"); + + return 0; +} + static int wsa884x_probe(struct sdw_slave *pdev, const struct sdw_device_id *id) { @@ -1838,11 +1874,9 @@ static int wsa884x_probe(struct sdw_slave *pdev, if (ret) return ret; - wsa884x->sd_n = devm_gpiod_get_optional(dev, "powerdown", - GPIOD_OUT_HIGH); - if (IS_ERR(wsa884x->sd_n)) - return dev_err_probe(dev, PTR_ERR(wsa884x->sd_n), - "Shutdown Control GPIO not found\n"); + ret = wsa884x_get_reset(dev, wsa884x); + if (ret) + return ret; dev_set_drvdata(dev, wsa884x); wsa884x->slave = pdev; @@ -1858,9 +1892,8 @@ static int wsa884x_probe(struct sdw_slave *pdev, pdev->prop.sink_dpn_prop = wsa884x_sink_dpn_prop; pdev->prop.scp_int1_mask = SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY; - /* Bring out of reset */ - gpiod_direction_output(wsa884x->sd_n, 0); - ret = devm_add_action_or_reset(dev, wsa884x_gpio_powerdown, wsa884x->sd_n); + wsa884x_reset_deassert(wsa884x); 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([178.197.223.112]) by smtp.gmail.com with ESMTPSA id bd16-20020a05600c1f1000b0040e5a93ae53sm6573195wmb.22.2024.01.12.08.36.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jan 2024 08:36:29 -0800 (PST) From: Krzysztof Kozlowski To: Bjorn Andersson , Konrad Dybcio , Srinivas Kandagatla , Banajit Goswami , Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Peter Rosin , Philipp Zabel , Jaroslav Kysela , Takashi Iwai , linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-sound@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org Cc: Chris Packham , Krzysztof Kozlowski , Bartosz Golaszewski , Sean Anderson Subject: [PATCH v3 5/5] i2c: muxes: pca954x: Allow sharing reset GPIO Date: Fri, 12 Jan 2024 17:36:08 +0100 Message-Id: <20240112163608.528453-6-krzysztof.kozlowski@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> References: <20240112163608.528453-1-krzysztof.kozlowski@linaro.org> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Chris Packham Some hardware designs with multiple PCA954x devices use a reset GPIO connected to all the muxes. Support this configuration by making use of the reset controller framework which can deal with the shared reset GPIOs. Fall back to the old GPIO descriptor method if the reset controller framework is not enabled. Signed-off-by: Chris Packham Acked-by: Peter Rosin Reviewed-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20240108041913.7078-1-chris.packham@alliedtelesis.co.nz Signed-off-by: Krzysztof Kozlowski --- If previous patches are fine, then this commit is independent and could be taken via I2C. Cc: Chris Packham Cc: Bartosz Golaszewski Cc: Sean Anderson --- drivers/i2c/muxes/i2c-mux-pca954x.c | 46 ++++++++++++++++++++++++----- 1 file changed, 38 insertions(+), 8 deletions(-) diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c index 2219062104fb..1702e8d49b91 100644 --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -49,6 +49,7 @@ #include #include #include +#include #include #include #include @@ -102,6 +103,9 @@ struct pca954x { unsigned int irq_mask; raw_spinlock_t lock; struct regulator *supply; + + struct gpio_desc *reset_gpio; + struct reset_control *reset_cont; }; /* Provide specs for the MAX735x, PCA954x and PCA984x types we know about */ @@ -477,6 +481,35 @@ static int pca954x_init(struct i2c_client *client, struct pca954x *data) return ret; } +static int pca954x_get_reset(struct device *dev, struct pca954x *data) +{ + data->reset_cont = devm_reset_control_get_optional_shared(dev, NULL); + if (IS_ERR(data->reset_cont)) + return dev_err_probe(dev, PTR_ERR(data->reset_cont), + "Failed to get reset\n"); + else if (data->reset_cont) + return 0; + + /* + * fallback to legacy reset-gpios + */ + data->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(data->reset_gpio)) { + return dev_err_probe(dev, PTR_ERR(data->reset_gpio), + "Failed to get reset gpio"); + } + + return 0; +} + +static void pca954x_reset_deassert(struct pca954x *data) +{ + if (data->reset_cont) + reset_control_deassert(data->reset_cont); + else + gpiod_set_value_cansleep(data->reset_gpio, 0); +} + /* * I2C init/probing/exit functions */ @@ -485,7 +518,6 @@ static int pca954x_probe(struct i2c_client *client) const struct i2c_device_id *id = i2c_client_get_device_id(client); struct i2c_adapter *adap = client->adapter; struct device *dev = &client->dev; - struct gpio_desc *gpio; struct i2c_mux_core *muxc; struct pca954x *data; int num; @@ -513,15 +545,13 @@ static int pca954x_probe(struct i2c_client *client) return dev_err_probe(dev, ret, "Failed to enable vdd supply\n"); - /* Reset the mux if a reset GPIO is specified. */ - gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); - if (IS_ERR(gpio)) { - ret = PTR_ERR(gpio); + ret = pca954x_get_reset(dev, data); + if (ret) goto fail_cleanup; - } - if (gpio) { + + if (data->reset_cont || data->reset_gpio) { udelay(1); - gpiod_set_value_cansleep(gpio, 0); + pca954x_reset_deassert(data); /* Give the chip some time to recover. */ udelay(1); }