linux-kernel - [PATCH] pwm: pca9685: use new GPIO line value setter callbacks

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Message-Id: <20250408-gpiochip-set-rv-pwm-v1-1-61e5c3358a74@linaro.org>
Date: Tue, 08 Apr 2025 09:31:46 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Uwe Kleine-König <ukleinek@...nel.org>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH] pwm: pca9685: use new GPIO line value setter callbacks

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
Commit 98ce1eb1fd87e ("gpiolib: introduce gpio_chip setters that return
values") added new line setter callbacks to struct gpio_chip. They allow
to indicate failures to callers. We're in the process of converting all
GPIO controllers to using them before removing the old ones.
---
 drivers/pwm/pwm-pca9685.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
index 5162f3991644..eb03ccd5b688 100644
--- a/drivers/pwm/pwm-pca9685.c
+++ b/drivers/pwm/pwm-pca9685.c
@@ -263,12 +263,14 @@ static int pca9685_pwm_gpio_get(struct gpio_chip *gpio, unsigned int offset)
 	return pca9685_pwm_get_duty(chip, offset) != 0;
 }
 
-static void pca9685_pwm_gpio_set(struct gpio_chip *gpio, unsigned int offset,
-				 int value)
+static int pca9685_pwm_gpio_set(struct gpio_chip *gpio, unsigned int offset,
+				int value)
 {
 	struct pwm_chip *chip = gpiochip_get_data(gpio);
 
 	pca9685_pwm_set_duty(chip, offset, value ? PCA9685_COUNTER_RANGE : 0);
+
+	return 0;
 }
 
 static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset)
@@ -321,7 +323,7 @@ static int pca9685_pwm_gpio_probe(struct pwm_chip *chip)
 	pca->gpio.direction_input = pca9685_pwm_gpio_direction_input;
 	pca->gpio.direction_output = pca9685_pwm_gpio_direction_output;
 	pca->gpio.get = pca9685_pwm_gpio_get;
-	pca->gpio.set = pca9685_pwm_gpio_set;
+	pca->gpio.set_rv = pca9685_pwm_gpio_set;
 	pca->gpio.base = -1;
 	pca->gpio.ngpio = PCA9685_MAXCHAN;
 	pca->gpio.can_sleep = true;

---
base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
change-id: 20250326-gpiochip-set-rv-pwm-e3b949d7296f

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>