linux-kernel - [PATCH 2/2] leds: pwm: Add optional DT property default-brightness

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Message-ID: <20241015151410.2158102-3-gnstark@salutedevices.com>
Date: Tue, 15 Oct 2024 18:14:10 +0300
From: George Stark <gnstark@...utedevices.com>
To: <pavel@....cz>, <lee@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>
CC: <linux-leds@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kernel@...utedevices.com>, George Stark
	<gnstark@...utedevices.com>
Subject: [PATCH 2/2] leds: pwm: Add optional DT property default-brightness

When probing if default LED state is on then default brightness will be
applied instead of max brightness.

Signed-off-by: George Stark <gnstark@...utedevices.com>
---
 drivers/leds/leds-pwm.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
index 7961dca0db2f..514fc8ca3e80 100644
--- a/drivers/leds/leds-pwm.c
+++ b/drivers/leds/leds-pwm.c
@@ -65,7 +65,8 @@ static int led_pwm_set(struct led_classdev *led_cdev,
 
 __attribute__((nonnull))
 static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
-		       struct led_pwm *led, struct fwnode_handle *fwnode)
+		       struct led_pwm *led, struct fwnode_handle *fwnode,
+		       unsigned int default_brightness)
 {
 	struct led_pwm_data *led_data = &priv->leds[priv->num_leds];
 	struct led_init_data init_data = { .fwnode = fwnode };
@@ -104,7 +105,7 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
 	/* set brightness */
 	switch (led->default_state) {
 	case LEDS_DEFSTATE_ON:
-		led_data->cdev.brightness = led->max_brightness;
+		led_data->cdev.brightness = default_brightness;
 		break;
 	case LEDS_DEFSTATE_KEEP:
 		{
@@ -141,6 +142,7 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
 static int led_pwm_create_fwnode(struct device *dev, struct led_pwm_priv *priv)
 {
 	struct led_pwm led;
+	unsigned int default_brightness;
 	int ret;
 
 	device_for_each_child_node_scoped(dev, fwnode) {
@@ -160,7 +162,12 @@ static int led_pwm_create_fwnode(struct device *dev, struct led_pwm_priv *priv)
 
 		led.default_state = led_init_default_state_get(fwnode);
 
-		ret = led_pwm_add(dev, priv, &led, fwnode);
+		ret = fwnode_property_read_u32(fwnode, "default-brightness",
+					       &default_brightness);
+		if (ret < 0 || default_brightness > led.max_brightness)
+			default_brightness = led.max_brightness;
+
+		ret = led_pwm_add(dev, priv, &led, fwnode, default_brightness);
 		if (ret)
 			return ret;
 	}
-- 
2.25.1