[PATCH V4] leds: rgb: leds-group-multicolor: Implement default-intensity

[Stefan Wahren <wahrenst@gmx.net>]

Currently it's not possible to specify the initial color of a LED
multicolor group during boot. So implement the default-intensity property
similar to the leds-pwm-multicolor driver. In case the property is
missing, the old behavior is kept.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Jonas Rebmann <jre@pengutronix.de>
---

Changes in V4:
- use device_property_read_u32 instead of fwnode_property_read_u32
- simplify if statement as suggested by Lee
- drop obvious comment

Changes in V3:
- drop unnecessary patch for leds-group-multicolor.yaml
- add Jonas' RB

Changes in V2:
- adapt to approach (incl. error behavior) by Jonas Rebmann [2]
- address comments by Lee which still apply

 drivers/leds/rgb/leds-group-multicolor.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/rgb/leds-group-multicolor.c b/drivers/leds/rgb/leds-group-multicolor.c
index 548c7dd63ba1..f278d2a2bf5c 100644
--- a/drivers/leds/rgb/leds-group-multicolor.c
+++ b/drivers/leds/rgb/leds-group-multicolor.c
@@ -109,8 +109,10 @@ static int leds_gmc_probe(struct platform_device *pdev)
 
 		subled[i].color_index = led_cdev->color;
 
-		/* Configure the LED intensity to its maximum */
-		subled[i].intensity = max_brightness;
+		ret = device_property_read_u32(led_cdev->dev, "default-intensity",
+					       &subled[i].intensity);
+		if (ret || subled[i].intensity > max_brightness)
+			subled[i].intensity = max_brightness;
 	}
 
 	/* Initialise the multicolor's LED class device */
-- 
2.43.0