linux-kernel - Re: [PATCH v1 1/2] dt-bindings: leds: add binding for aw200xx

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Message-ID: <20221202185308.zh5kesfxvyrco2cr@CAB-WSD-L081021>
Date:   Fri, 2 Dec 2022 21:53:08 +0300
From:   Dmitry Rokosov <ddrokosov@...rdevices.ru>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     Martin Kurbanov <MMKurbanov@...rdevices.ru>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>
Subject: Re: [PATCH v1 1/2] dt-bindings: leds: add binding for aw200xx

Hello Krzysztof,

On Fri, Dec 02, 2022 at 05:41:37PM +0100, Krzysztof Kozlowski wrote:
> On 28/11/2022 18:43, Martin Kurbanov wrote:
> > Hi. Thank you for quick reply. 
> > 
> > On 25.11.2022 11:29, Krzysztof Kozlowski wrote:
> >>> +
> >>> +  imax:
> >>> +    maxItems: 1
> >>> +    description:
> >>> +      Maximum supply current, see dt-bindings/leds/leds-aw200xx.h
> >>
> >> No. Use existing properties from common.yaml. This looks like
> >> led-max-microamp and it is per LED, not per entire device.
> > 
> > The AW200XX LED chip does not support imax setup per led.
> > Imax is the global parameter over the all leds. I suppose, it's better
> > to add vendor prefix or take minimum from all subnodes?
> > How do you think?
> 
> Have in mind that led-max-microamp is a required property in some cases,
> so skipping it and using per-device properties does not solve the
> problem of adjusting proper currents. What if each LED you set for
> something which in total gives more than your imax?
> 

You are right. From my point of view too, we must build our solutions from
HW capabilities. In the current situation, AW200XX chips support global
Imax value, so it's acceptable decision to use vendor prefix for global
imax parameter, why not?

...

-- 
Thank you,
Dmitry