linux-kernel - Re: [PATCH 5/5] ARM: dts: qcom: msm8974-oneplus-bacon: Add notification LED

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Date:   Thu, 26 Jan 2023 21:41:58 +0100
From:   Luca Weiss <luca@...tu.xyz>
To:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] ARM: dts: qcom: msm8974-oneplus-bacon: Add notification LED

On Donnerstag, 26. Jänner 2023 10:41:24 CET Krzysztof Kozlowski wrote:
> On 25/01/2023 21:51, Luca Weiss wrote:
> > On Montag, 23. Jänner 2023 18:18:16 CET Krzysztof Kozlowski wrote:
> >> On 22/01/2023 17:48, Luca Weiss wrote:
> >>> Add the node describing the sn3193 that's used to provide notification
> >>> LED.
> >>> 
> >>> Unfortunately the driver currently supports neither multicolor API nor
> >>> using the properties function & color, so we use label instead.
> >>> 
> >>> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> >>> ---
> >>> 
> >>>  .../arm/boot/dts/qcom-msm8974pro-oneplus-bacon.dts | 28
> >>>  ++++++++++++++++++++++ 1 file changed, 28 insertions(+)
> >>> 
> >>> diff --git a/arch/arm/boot/dts/qcom-msm8974pro-oneplus-bacon.dts
> >>> b/arch/arm/boot/dts/qcom-msm8974pro-oneplus-bacon.dts index
> >>> ffb486ceb6a6..a672c45d7070 100644
> >>> --- a/arch/arm/boot/dts/qcom-msm8974pro-oneplus-bacon.dts
> >>> +++ b/arch/arm/boot/dts/qcom-msm8974pro-oneplus-bacon.dts
> >>> @@ -114,6 +114,34 @@ led@0 {
> >>> 
> >>>  			default-brightness = <80>;
> >>>  		
> >>>  		};
> >>>  	
> >>>  	};
> >>> 
> >>> +
> >>> +	led-controller@68 {
> >>> +		compatible = "si-en,sn3193";
> >>> +		reg = <0x68>;
> >>> +
> >>> +		shutdown-gpios = <&tlmm 45 GPIO_ACTIVE_HIGH>;
> >>> +
> >>> +		#address-cells = <1>;
> >>> +		#size-cells = <0>;
> >>> +
> >>> +		led@1 {
> >>> +			reg = <1>;
> >>> +			label = "red:status";
> >> 
> >> These should be colors and functions.
> > 
> > Hi Krzysztof,
> > 
> > please check the commit message for this. I tried using it but it didn't
> > work, the driver in general might need an overhaul at some point...
> > 
> >> Unfortunately the driver currently supports neither multicolor API nor
> >> using the properties function & color, so we use label instead.
> > 
> > Or maybe I messed up but pretty sure this was the case when I wrote the
> > dts.
> I don't understand how driver is related here - it's not the driver's
> property, but LED core. If the driver "supports" label, then it supports
> color and status.

The leds-is31fl319x.c driver uses devm_led_classdev_register but the function 
where 'function' and 'color' is parsed is led_parse_fwnode_props which is 
called from led_compose_name which is called from led_classdev_register_ext 
(or with the devm_ prefix), and not called from the register method without 
_ext suffix.

So in other words, the led driver would need changes to use the new 
registration API to be able to use 'function' and 'color' instead of 'label'.

Regards
Luca

> 
> Best regards,
> Krzysztof