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Mon, 05 May 2025 04:37:53 -0700 (PDT) Date: Mon, 5 May 2025 14:37:50 +0300 From: Dan Carpenter To: Linus Walleij Cc: Bartosz Golaszewski , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Takahiro AKASHI Subject: [RFC 3/7] pinctrl: introduce pinctrl_gpio_get_config() Message-ID: <0e982ace876920162d27a521f5f460b1dd6fc929.1746443762.git.dan.carpenter@linaro.org> References: Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: From: AKASHI Takahiro This is a counterpart of pinctrl_gpio_set_config(), which will initially be used to implement gpio_get interface in SCMI pinctrl based GPIO driver. Signed-off-by: AKASHI Takahiro Signed-off-by: Dan Carpenter --- drivers/pinctrl/core.c | 35 ++++++++++++++++++++++++++++++++ include/linux/pinctrl/consumer.h | 9 ++++++++ 2 files changed, 44 insertions(+) diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index 4bdbf6bb26e2..4310f9e2118b 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include "core.h" @@ -937,6 +938,40 @@ int pinctrl_gpio_set_config(struct gpio_chip *gc, unsigned int offset, } EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config); +/** + * pinctrl_gpio_get_config() - Get the config for a given GPIO pin + * @gc: GPIO chip structure from the GPIO subsystem + * @offset: hardware offset of the GPIO relative to the controller + * @config: the configuration to query. On success it holds the result + */ +int pinctrl_gpio_get_config(struct gpio_chip *gc, unsigned int offset, unsigned long *config) +{ + struct pinctrl_gpio_range *range; + const struct pinconf_ops *ops; + struct pinctrl_dev *pctldev; + int ret, pin; + + ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range); + if (ret) + return ret; + + ops = pctldev->desc->confops; + if (!ops || !ops->pin_config_get) + return -EINVAL; + + mutex_lock(&pctldev->mutex); + pin = gpio_to_pin(range, gc, offset); + ret = ops->pin_config_get(pctldev, pin, config); + mutex_unlock(&pctldev->mutex); + + if (ret) + return ret; + + *config = pinconf_to_config_argument(*config); + return 0; +} +EXPORT_SYMBOL_GPL(pinctrl_gpio_get_config); + static struct pinctrl_state *find_state(struct pinctrl *p, const char *name) { diff --git a/include/linux/pinctrl/consumer.h b/include/linux/pinctrl/consumer.h index 73de70362b98..e5815b3382dc 100644 --- a/include/linux/pinctrl/consumer.h +++ b/include/linux/pinctrl/consumer.h @@ -35,6 +35,8 @@ int pinctrl_gpio_direction_output(struct gpio_chip *gc, unsigned int offset); int pinctrl_gpio_set_config(struct gpio_chip *gc, unsigned int offset, unsigned long config); +int pinctrl_gpio_get_config(struct gpio_chip *gc, unsigned int offset, + unsigned long *config); struct pinctrl * __must_check pinctrl_get(struct device *dev); void pinctrl_put(struct pinctrl *p); @@ -96,6 +98,13 @@ pinctrl_gpio_direction_output(struct gpio_chip *gc, unsigned int offset) return 0; } +static inline int +pinctrl_gpio_get_config(struct gpio_chip *gc, unsigned int offset, + unsigned long *config) +{ + return 0; +} + static inline int pinctrl_gpio_set_config(struct gpio_chip *gc, unsigned int offset, unsigned long config)