linux-kernel - Re: [PATCH 5/7] ARM: dts: exynos: k3g: Add notification LED support

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Date:   Wed, 19 Jul 2023 11:17:26 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Markuss Broks <markuss.broks@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] ARM: dts: exynos: k3g: Add notification LED support

On 17/07/2023 00:05, Markuss Broks wrote:
> This device has a Texas Instruments LP5562 LED controller
> which controls the LEDs which are used as notification lights.
> It has three colors which can be combined, supports pulse mode
> and other various features.
> 
> Signed-off-by: Markuss Broks <markuss.broks@...il.com>
> ---
>  arch/arm/boot/dts/exynos5422-samsung-k3g.dts | 47 ++++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos5422-samsung-k3g.dts b/arch/arm/boot/dts/exynos5422-samsung-k3g.dts
> index b3576a745054..813dbf0438de 100644
> --- a/arch/arm/boot/dts/exynos5422-samsung-k3g.dts
> +++ b/arch/arm/boot/dts/exynos5422-samsung-k3g.dts
> @@ -10,6 +10,7 @@
>  #include <dt-bindings/gpio/gpio.h>
>  #include <dt-bindings/input/input.h>
>  #include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/leds/common.h>
>  #include "exynos5800.dtsi"
>  #include "exynos5422-cpus.dtsi"
>  
> @@ -131,6 +132,52 @@ touchkey@20 {
>  		};
>  	};
>  
> +	i2c-led {
> +		compatible = "i2c-gpio";
> +
> +		sda-gpios = <&gpy3 6 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> +		scl-gpios = <&gpy3 7 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
> +		i2c-gpio,delay-us = <2>;
> +
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		lp5562@30 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

Most likely this is led-controller



Best regards,
Krzysztof