linux-kernel - Re: [PATCH v2 7/8] arm64: dts: mediatek: cherry: Enable keyboard PWM backlight

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Date:   Mon, 25 Jul 2022 12:04:07 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>
Cc:     matthias.bgg@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/8] arm64: dts: mediatek: cherry: Enable keyboard PWM
 backlight

Il 25/07/22 11:57, Chen-Yu Tsai ha scritto:
> n Thu, Jul 21, 2022 at 10:53 PM AngeloGioacchino Del Regno
> <angelogioacchino.delregno@...labora.com> wrote:
>>
>> Add a pwm-leds node to enable the PWM controlled keyboard backlight.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> ---
>>   arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi | 13 +++++++++++++
>>   1 file changed, 13 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
>> index ca9955a97f8f..9086a440a995 100644
>> --- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
>> +++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
>> @@ -4,6 +4,7 @@
>>    */
>>
>>   #include <dt-bindings/gpio/gpio.h>
>> +#include <dt-bindings/leds/common.h>
>>   #include "mt8195.dtsi"
>>   #include "mt6359.dtsi"
>>
>> @@ -31,6 +32,18 @@ dmic_codec: dmic-codec {
>>                  wakeup-delay-ms = <50>;
>>          };
>>
>> +       led-controller {
>> +               compatible = "pwm-leds";
>> +
>> +               keyboard_backlight: keyboard-backlight {
>> +                       default-state = "off";
>> +                       function = LED_FUNCTION_KBD_BACKLIGHT;
>> +                       label = "cros_ec::kbd_backlight";
>> +                       max-brightness = <1023>;
>> +                       pwms = <&cros_ec_pwm 3>;
>> +               };
>> +       };
>> +
> 
> This didn't work for me. However using "google,cros-kbd-led-backlight"
> under the EC did. That might be a better option.

Strange. But okay if there's a better option I'll check that out for v3.

Cheers!
Angelo

> 
> ChenYu
> 
>>          memory@...00000 {
>>                  device_type = "memory";
>>                  reg = <0 0x40000000 0 0x80000000>;
>> --
>> 2.35.1
>>
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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