linux-kernel - [PATCH v1] leds: lp50xx: add setting of default intensity from DT

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Message-Id: <20210119105312.2636-1-schuchmann@schleissheimer.de>
Date:   Tue, 19 Jan 2021 10:53:12 +0000
From:   Sven Schuchmann <schuchmann@...leissheimer.de>
To:     schuchmann@...leissheimer.de
Cc:     Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>,
        Rob Herring <robh+dt@...nel.org>, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] leds: lp50xx: add setting of default intensity from DT

In order to use a multicolor-led together with a trigger
from DT the led needs to have an intensity set to see something.
The trigger changes the brightness of the led but if there
is no intensity we actually see nothing.

This patch adds the ability to set the default intensity
of each led so that it is turned on from DT.

Signed-off-by: Sven Schuchmann <schuchmann@...leissheimer.de>
---
 Documentation/devicetree/bindings/leds/leds-lp50xx.yaml | 8 +++++++-
 drivers/leds/leds-lp50xx.c                              | 4 ++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/leds/leds-lp50xx.yaml b/Documentation/devicetree/bindings/leds/leds-lp50xx.yaml
index c192b5feadc7..5ad2a0c3c052 100644
--- a/Documentation/devicetree/bindings/leds/leds-lp50xx.yaml
+++ b/Documentation/devicetree/bindings/leds/leds-lp50xx.yaml
@@ -69,7 +69,12 @@ patternProperties:
     patternProperties:
       "(^led-[0-9a-f]$|led)":
         type: object
-        $ref: common.yaml#
+        allOf:
+          - $ref: common.yaml#
+        properties:
+          default-intensity:
+            maxItems: 1
+            description: The intensity the LED gets initialised with.
 
 required:
   - compatible
@@ -102,6 +107,7 @@ examples:
 
                led-0 {
                    color = <LED_COLOR_ID_RED>;
+                   default-intensity = <100>;
                };
 
                led-1 {
diff --git a/drivers/leds/leds-lp50xx.c b/drivers/leds/leds-lp50xx.c
index f13117eed976..ba760fa33bdc 100644
--- a/drivers/leds/leds-lp50xx.c
+++ b/drivers/leds/leds-lp50xx.c
@@ -501,6 +501,10 @@ static int lp50xx_probe_dt(struct lp50xx *priv)
 			}
 
 			mc_led_info[num_colors].color_index = color_id;
+
+			fwnode_property_read_u32(led_node, "default-intensity",
+						 &mc_led_info[num_colors].intensity);
+
 			num_colors++;
 		}
 
-- 
2.17.1