drm/bridge: ti-sn65dsi86: use new GPIO line value setter callbacks

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@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20250610-gpiochip-set-rv-gpu-v1-1-ac0a21e74b71@linaro.org

Author: Bartosz Golaszewski

drivers/gpu/drm/bridge/ti-sn65dsi86.c

@@ -1672,24 +1672,20 @@ static int ti_sn_bridge_gpio_get(struct gpio_chip *chip, unsigned int offset)
 	return !!(val & BIT(SN_GPIO_INPUT_SHIFT + offset));
 }
 
-static void ti_sn_bridge_gpio_set(struct gpio_chip *chip, unsigned int offset,
-				  int val)
+static int ti_sn_bridge_gpio_set(struct gpio_chip *chip, unsigned int offset,
+				 int val)
 {
 	struct ti_sn65dsi86 *pdata = gpiochip_get_data(chip);
-	int ret;
 
 	if (!test_bit(offset, pdata->gchip_output)) {
 		dev_err(pdata->dev, "Ignoring GPIO set while input\n");
-		return;
+		return -EPERM;
 	}
 
 	val &= 1;
-	ret = regmap_update_bits(pdata->regmap, SN_GPIO_IO_REG,
-				 BIT(SN_GPIO_OUTPUT_SHIFT + offset),
-				 val << (SN_GPIO_OUTPUT_SHIFT + offset));
-	if (ret)
-		dev_warn(pdata->dev,
-			 "Failed to set bridge GPIO %u: %d\n", offset, ret);
+	return regmap_update_bits(pdata->regmap, SN_GPIO_IO_REG,
+				  BIT(SN_GPIO_OUTPUT_SHIFT + offset),
+				  val << (SN_GPIO_OUTPUT_SHIFT + offset));
 }
 
 static int ti_sn_bridge_gpio_direction_input(struct gpio_chip *chip,
@@ -1793,7 +1789,7 @@ static int ti_sn_gpio_probe(struct auxiliary_device *adev,
 	pdata->gchip.direction_input = ti_sn_bridge_gpio_direction_input;
 	pdata->gchip.direction_output = ti_sn_bridge_gpio_direction_output;
 	pdata->gchip.get = ti_sn_bridge_gpio_get;
-	pdata->gchip.set = ti_sn_bridge_gpio_set;
+	pdata->gchip.set_rv = ti_sn_bridge_gpio_set;
 	pdata->gchip.can_sleep = true;
 	pdata->gchip.names = ti_sn_bridge_gpio_names;
 	pdata->gchip.ngpio = SN_NUM_GPIOS;