Re: [PATCH] arm64: dts: imx8mm-evk: add pwm1/backlight support

[Krzysztof Kozlowski]

On 13/04/2022 13:58, Tommaso Merciai wrote:
>>> +	backlight: backlight {
>>> +		status = "disabled";
>>
>> Why disabled?
>>
>>> +		compatible = "pwm-backlight";
>>> +		pwms = <&pwm1 0 5000000>;
>>> +		brightness-levels = <0 255>;
>>> +		num-interpolated-steps = <255>;
>>> +		default-brightness-level = <250>;
>>> +	};
>>> +
>>>  	ir-receiver {
>>>  		compatible = "gpio-ir-receiver";
>>>  		gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;
>>> @@ -395,6 +404,12 @@ &wdog1 {
>>>  	status = "okay";
>>>  };
>>>  
>>> +&pwm1 {
>>> +	pinctrl-names = "default";
>>> +	pinctrl-0 = <&pinctrl_backlight>;
>>> +	status = "disabled";
>>
>> Same here.
>>
>>
>> Best regards,
>> Krzysztof
> 
> Hi Krzysztof,
> I think is better to keep disable into .dtsi and enable it at .dts
> level.
> What do you think about?

Why better? This is already board DTSI, not a SoC DTSI. All boards using
it are supposed to have it available, aren't they?

Usually nodes should be disabled in a DTSI if they need some resources
not available in that DTSI. For example if they need some supply. It's
not the case here, right?


Best regards,
Krzysztof