linux-kernel - Define LEDs with mixed colors

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Message-ID: <DBAPR10MB42195CA4E52FDD30F0598AE98ACD9@DBAPR10MB4219.EURPRD10.PROD.OUTLOOK.COM>
Date:   Wed, 1 Sep 2021 08:39:08 +0000
From:   "hamza.farooq@...mens.com" <hamza.farooq@...mens.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        "henning.schild@...mens.com" <henning.schild@...mens.com>,
        "jan.kiszka@...mens.com" <jan.kiszka@...mens.com>,
        "Haeussler, Gerd" <gerd.haeussler.ext@...mens.com>
Subject: Define LEDs with mixed colors

Hello all,

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?
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?
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.

Best,
Hamza