-----Original Message-----
From: Pavel Machek <redacted>
Sent: Wednesday, September 1, 2021 1:09 PM
To: Farooq, Muhammad Hamza (DI FA CTR IPC PRC2)
[off-list ref]
Cc: Andy Shevchenko <redacted>; Linux Kernel Mailing
List [off-list ref]; Linux LED Subsystem <linux-
leds@vger.kernel.org>; Platform Driver <platform-driver-
x86@vger.kernel.org>; Schild, Henning (T RDA IOT SES-DE)
[off-list ref]; Kiszka, Jan (T RDA IOT)
[off-list ref]; Haeussler, Gerd (ext) (DI FA CTR IPC PRC2)
[off-list ref]
Subject: Re: Define LEDs with mixed colors

Hi!

quoted

I am toying with the idea of writing a multicolor LED GPIO driver. What

would be the right way to define mixed color LEDs (for leds-gpio), in device
tree or ACPI?

quoted

Consider the following:

leds {
	compatible = "gpio-leds";
	led0 {
		gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW>;
		color = <LED_COLOR_ID_RED>;
	};

	led1 {
		gpios = <&mcu_pio 1 GPIO_ACTIVE_HIGH>;
		color = <LED_COLOR_ID_GREEN>;
	};
	led2 {
		gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW
			&mcu_pio 1 GPIO_ACTIVE_LOW>;
		color = <LED_COLOR_ID_AMBER>;
	};
};

This probably won't work as "gpios" seem to be single object in gpio-leds

driver code, but what can I do to achieve something similar?

quoted

It is important to define this LED in DT/ACPI in order for the user app to see

it in the /sys/class/led folder, without having to write platform-specific
driver.

quoted

So you have one package with red and green LED, each connected to one
GPIO?

Right. It is possible to create orange color, and I want to use DT/ACPI to present this info to the userland.

Can you take a look at Documentation/leds/leds-class-multicolor.rst?

Couldn't find a hint there therefore this email thread. I might eventually write a multicolor led-gpio driver so want to know how to handle mixed LED.

Best regards,
								Pavel
--
http://www.livejournal.com/~pavelmachek