Re: [PATCH 04/24] dt-bindings: leds: Add function and color properties

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On 07/11/2018 0.07, Jacek Anaszewski wrote:
Introduce dedicated properties for conveying information about
LED function and color. Mark old "label" property as deprecated.

Signed-off-by: Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxx>
Cc: Daniel Mack <daniel@xxxxxxxxxx>
Cc: Dan Murphy <dmurphy@xxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Oleh Kravchenko <oleg@xxxxxxxxxx>
Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Cc: Simon Shields <simon@xxxxxxxxxxxxx>
Cc: Xiaotong Lu <xiaotong.lu@xxxxxxxxxxxxxx>
---
  Documentation/devicetree/bindings/leds/common.txt | 52 +++++++++++++++++++----
  1 file changed, 44 insertions(+), 8 deletions(-)

diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
index aa13998..3efc826 100644
--- a/Documentation/devicetree/bindings/leds/common.txt
+++ b/Documentation/devicetree/bindings/leds/common.txt
@@ -10,14 +10,20 @@ can influence the way of the LED device initialization, the LED components
  have to be tightly coupled with the LED device binding. They are represented
  by child nodes of the parent LED device binding.
+
  Optional properties for child nodes:
  - led-sources : List of device current outputs the LED is connected to. The
  		outputs are identified by the numbers that must be defined
  		in the LED device binding documentation.
+- function: LED functon. Use one of the LED_FUNCTION_* prefixed definitions
+	    from the header include/dt-bindings/leds/functions.h.
+	    If there is no matching LED_FUNCTION available, add a new one.
+- color : Color of the LED.

We have had for years out-of-tree patch for multi color gpio led driver which extends this concept with multiple colors. Then in sysfs there has been possibility to control the color and otherwise use blinking or other features.

Our need is multi color status led of the device which includes different kind of blinkings and colors on different situations.

Current in-tree gpio led driver just wasn't atomic enough and a bit clumsy interface for handling this.

Now that this is being looked at could we come up with solution that we could define multiple colors for one led in device tree and then we could work on getting the driver upstreamed?

What we did was generally:

leds-multi {
	compatible = "gpio-multi-leds";

	status {
		gpios = <...>;
		linux,default-trigger = "none";
		deafult-state = "keep";

		color-red {
			pin-mask = <0x01>;
		};

		color-green {
			pin-mask = <0x02>;
		};

		color-orange {
			pin-mask = <0x03>;
		};
	};
};

Thanks,
Vesa Jääskeläinen



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