From patchwork Thu Aug 27 06:28:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 11739997 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C5D7E722 for ; Thu, 27 Aug 2020 06:28:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E1AC22B47 for ; Thu, 27 Aug 2020 06:28:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598509695; bh=6Eaf0eH5+LulpBg3v/P820gMYLVyN/SZjt9josFSQN4=; h=From:To:Cc:Subject:Date:List-ID:From; b=c/dQW0Mzo//LAlPE6GQQhhKLOS5YIETkWOAeyWNc/pjO6GwWefUJJxDMSuPqwf2sQ USHOoWacvRwFPpTPaP73Ip//lNt1YkdGe4fX053tXLe7IQ5lTG1bZplr/Q0jXKUCe+ r4t+73ceu2hfBb4qIW68ZA9Gnd5Cs+oFzaCbFEcY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726938AbgH0G2O (ORCPT ); Thu, 27 Aug 2020 02:28:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:40926 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726199AbgH0G2N (ORCPT ); Thu, 27 Aug 2020 02:28:13 -0400 Received: from kozik-lap.mshome.net (unknown [194.230.155.216]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 984912177B; Thu, 27 Aug 2020 06:28:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598509692; bh=6Eaf0eH5+LulpBg3v/P820gMYLVyN/SZjt9josFSQN4=; h=From:To:Cc:Subject:Date:From; b=v/KgMV1yyfnNbAVXpgulbCCKQ8bAsf5zMgCXiqMMjMMn/B1RDWR7rQMAGLB3KkOjQ FjuMxCK+Jr3M2HbKgbjxJPF2VRHnhzs4OVULE9qgn2+g6oq42D3bFT0rF9S7LdKA/T nf1RH9Gvo4KYPlfUQj8HAF8nG99/yEwpvAEgignY= From: Krzysztof Kozlowski To: Linus Walleij , Bartosz Golaszewski , Dmitry Torokhov , Nathan Chancellor , Nick Desaulniers , "Gustavo A. R. Silva" , Krzysztof Kozlowski , Hans de Goede , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, clang-built-linux@googlegroups.com Cc: Andy Shevchenko Subject: [PATCH v3 1/2] gpio: Add devm_fwnode_gpiod_get_optional() helpers Date: Thu, 27 Aug 2020 08:28:03 +0200 Message-Id: <20200827062804.16730-1-krzk@kernel.org> X-Mailer: git-send-email 2.17.1 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Add devm_fwnode_gpiod_get_optional() and devm_fwnode_gpiod_get_index_optional() helpers, similar to regular devm_gpiod optional versions. Drivers getting GPIOs from a firmware node might use it to remove some boilerplate code. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Andy Shevchenko --- Changes since v2: 1. Return NULL Changes since v1: 1. New patch --- drivers/gpio/gpiolib-devres.c | 71 +++++++++++++++++++++++++++++++++++ include/linux/gpio/consumer.h | 30 +++++++++++++++ 2 files changed, 101 insertions(+) diff --git a/drivers/gpio/gpiolib-devres.c b/drivers/gpio/gpiolib-devres.c index 7dbce4c4ebdf..f8476f6a65cc 100644 --- a/drivers/gpio/gpiolib-devres.c +++ b/drivers/gpio/gpiolib-devres.c @@ -184,6 +184,37 @@ struct gpio_desc *devm_gpiod_get_from_of_node(struct device *dev, } EXPORT_SYMBOL_GPL(devm_gpiod_get_from_of_node); +/** + * devm_fwnode_gpiod_get_optional - Resource-managed fwnode_gpiod_get_index() + * for optional GPIO + * @dev: GPIO consumer + * @fwnode: firmware node containing GPIO reference + * @con_id: function within the GPIO consumer + * @flags: GPIO initialization flags + * @label: label to attach to the requested GPIO + * + * GPIO descriptors returned from this function are automatically disposed on + * driver detach. + * + * This is equivalent to devm_fwnode_gpiod_get_index(), except that when no + * GPIO with the specified index was assigned to the requested function it will + * return NULL. This is convenient for drivers that need to handle optional + * GPIOs. + * + * On successful request the GPIO pin is configured in accordance with + * provided @flags. + */ +struct gpio_desc *devm_fwnode_gpiod_get_optional(struct device *dev, + struct fwnode_handle *fwnode, + const char *con_id, + enum gpiod_flags flags, + const char *label) +{ + return devm_fwnode_gpiod_get_index_optional(dev, fwnode, con_id, 0, + flags, label); +} +EXPORT_SYMBOL_GPL(devm_fwnode_gpiod_get_optional); + /** * devm_fwnode_gpiod_get_index - get a GPIO descriptor from a given node * @dev: GPIO consumer @@ -226,6 +257,46 @@ struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev, } EXPORT_SYMBOL_GPL(devm_fwnode_gpiod_get_index); +/** + * devm_fwnode_gpiod_get_index_optional - Resource-managed fwnode_gpiod_get_index() + * for optional GPIO + * @dev: GPIO consumer + * @fwnode: firmware node containing GPIO reference + * @con_id: function within the GPIO consumer + * @index: index of the GPIO to obtain in the consumer + * @flags: GPIO initialization flags + * @label: label to attach to the requested GPIO + * + * GPIO descriptors returned from this function are automatically disposed on + * driver detach. + * + * This is equivalent to devm_fwnode_gpiod_get_index(), except that when no + * GPIO with the specified index was assigned to the requested function it will + * return NULL. This is convenient for drivers that need to handle optional + * GPIOs. + * + * On successful request the GPIO pin is configured in accordance with + * provided @flags. + */ +struct gpio_desc *devm_fwnode_gpiod_get_index_optional(struct device *dev, + struct fwnode_handle *fwnode, + const char *con_id, int index, + enum gpiod_flags flags, + const char *label) +{ + struct gpio_desc *desc; + + desc = devm_fwnode_gpiod_get_index(dev, fwnode, con_id, index, flags, + label); + if (IS_ERR(desc)) { + if (PTR_ERR(desc) == -ENOENT) + return NULL; + } + + return desc; +} +EXPORT_SYMBOL_GPL(devm_fwnode_gpiod_get_index_optional); + /** * devm_gpiod_get_index_optional - Resource-managed gpiod_get_index_optional() * @dev: GPIO consumer diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h index 901aab89d025..7854d80b1e9a 100644 --- a/include/linux/gpio/consumer.h +++ b/include/linux/gpio/consumer.h @@ -183,11 +183,21 @@ struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode, const char *con_id, int index, enum gpiod_flags flags, const char *label); +struct gpio_desc *devm_fwnode_gpiod_get_optional(struct device *dev, + struct fwnode_handle *fwnode, + const char *con_id, + enum gpiod_flags flags, + const char *label); struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev, struct fwnode_handle *child, const char *con_id, int index, enum gpiod_flags flags, const char *label); +struct gpio_desc *devm_fwnode_gpiod_get_index_optional(struct device *dev, + struct fwnode_handle *fwnode, + const char *con_id, int index, + enum gpiod_flags flags, + const char *label); #else /* CONFIG_GPIOLIB */ @@ -562,6 +572,16 @@ struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode, return ERR_PTR(-ENOSYS); } +static inline +struct gpio_desc *devm_fwnode_gpiod_get_optional(struct device *dev, + struct fwnode_handle *fwnode, + const char *con_id, + enum gpiod_flags flags, + const char *label) +{ + return NULL; +} + static inline struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev, struct fwnode_handle *fwnode, @@ -572,6 +592,16 @@ struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev, return ERR_PTR(-ENOSYS); } +static inline +struct gpio_desc *devm_fwnode_gpiod_get_index_optional(struct device *dev, + struct fwnode_handle *fwnode, + const char *con_id, int index, + enum gpiod_flags flags, + const char *label) +{ + return NULL; +} + #endif /* CONFIG_GPIOLIB */ static inline From patchwork Thu Aug 27 06:28:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 11739999 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E9E5114F6 for ; Thu, 27 Aug 2020 06:28:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CF75222B40 for ; Thu, 27 Aug 2020 06:28:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598509706; bh=uTlyu4Ggbom6cpomUXJKQ1GKWCdyLuFd3Pick+7iBao=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xFA6oaJqnVgnYza3v9u6AdcfLDAjgeIuhP1/NpyC1BbWfDbA+x21S8/fJq4bLYqbM SFE6OaUV9HUXRxGPca1SYIHMnjoKAecq2B7VW/hETAZp/SvW0LxvTb6U1f84povNWh SGFy9riZXFVhOYewdJRrbopiQ0Tec9PciytzceNM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727784AbgH0G2T (ORCPT ); Thu, 27 Aug 2020 02:28:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:40990 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726199AbgH0G2Q (ORCPT ); Thu, 27 Aug 2020 02:28:16 -0400 Received: from kozik-lap.mshome.net (unknown [194.230.155.216]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1DDEF22B49; Thu, 27 Aug 2020 06:28:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598509695; bh=uTlyu4Ggbom6cpomUXJKQ1GKWCdyLuFd3Pick+7iBao=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nO8NuCnVpOQBELP+v/O22dxuv09RFbjRFq/uuriGLAgYqTIEZrsSmItlVXgtxwd7v t1/0qQ87dP254Xh9i2+lbDYE5U0jXlgQi1fC7bWJznJbyPfh1rVCxOf+GAITgh+pxM kjhL+WjNZJro0xiZqk1xVGhmCcNfZ5xUO6W4RLRs= From: Krzysztof Kozlowski To: Linus Walleij , Bartosz Golaszewski , Dmitry Torokhov , Nathan Chancellor , Nick Desaulniers , "Gustavo A. R. Silva" , Krzysztof Kozlowski , Hans de Goede , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, clang-built-linux@googlegroups.com Cc: Andy Shevchenko Subject: [PATCH v3 2/2] Input: gpio_keys - Simplify with dev_err_probe() Date: Thu, 27 Aug 2020 08:28:04 +0200 Message-Id: <20200827062804.16730-2-krzk@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200827062804.16730-1-krzk@kernel.org> References: <20200827062804.16730-1-krzk@kernel.org> Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Common pattern of handling deferred probe can be simplified with dev_err_probe() and devm_fwnode_gpiod_get_optional(). Less code and the error value gets printed. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Hans de Goede --- Changes since v2: 1. Preserve comment, 2. Include to fix warning on clang (reported by kbuild), 3. Fix use of uninitialized "error" variable. Changes since v1: 1. Use devm_fwnode_gpiod_get_optional --- drivers/input/keyboard/gpio_keys.c | 25 ++++++++----------------- 1 file changed, 8 insertions(+), 17 deletions(-) diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c index f2d4e4daa818..160d94b1c2c0 100644 --- a/drivers/input/keyboard/gpio_keys.c +++ b/drivers/input/keyboard/gpio_keys.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -494,23 +495,13 @@ static int gpio_keys_setup_key(struct platform_device *pdev, spin_lock_init(&bdata->lock); if (child) { - bdata->gpiod = devm_fwnode_gpiod_get(dev, child, - NULL, GPIOD_IN, desc); - if (IS_ERR(bdata->gpiod)) { - error = PTR_ERR(bdata->gpiod); - if (error == -ENOENT) { - /* - * GPIO is optional, we may be dealing with - * purely interrupt-driven setup. - */ - bdata->gpiod = NULL; - } else { - if (error != -EPROBE_DEFER) - dev_err(dev, "failed to get gpio: %d\n", - error); - return error; - } - } + /* + * GPIO is optional, we may be dealing with purely + * interrupt-driven setup. + */ + bdata->gpiod = devm_fwnode_gpiod_get_optional(dev, child, NULL, GPIOD_IN, desc); + if (IS_ERR(bdata->gpiod)) + return dev_err_probe(dev, PTR_ERR(bdata->gpiod), "failed to get gpio\n"); } else if (gpio_is_valid(button->gpio)) { /* * Legacy GPIO number, so request the GPIO here and