linux-kernel - Re: [PATCH v2 03/11] regulator: dt-bindings: mt6358: Convert to DT schema

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Message-ID: <CAGXv+5GL+Ltn-X-Hzxj7Wz_ztPVkCfo=WV6XdXGw_-j6ZhCF6w@mail.gmail.com>
Date:   Wed, 23 Aug 2023 16:13:57 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Mark Brown <broonie@...nel.org>,
        Zhiyong Tao <zhiyong.tao@...iatek.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 03/11] regulator: dt-bindings: mt6358: Convert to DT schema

On Wed, Aug 23, 2023 at 1:48 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 23/08/2023 05:54, Chen-Yu Tsai wrote:
> >>> +
> >>> +    regulator {
> >>> +        compatible = "mediatek,mt6358-regulator";
> >>> +
> >>> +        buck_vgpu {
> >>> +            regulator-name = "vgpu";
> >>> +            regulator-min-microvolt = <625000>;
> >>> +            regulator-max-microvolt = <900000>;
> >>> +            regulator-ramp-delay = <6250>;
> >>> +            regulator-enable-ramp-delay = <200>;
> >>> +            regulator-allowed-modes = <MT6397_BUCK_MODE_AUTO
> >>
> >> mt6397?
> >>
> >> Both cases look a bit confusing.
> >
> > There's only two regulator binding header files, mt6397 and mt6360.
> > They seem to correspond to the two classes of PMICs that MediaTek has.
> > I believe the two header files and thus the macros are meant to be
> > shared?
>
> Defines have specific model name, so they do not look like meant to be
> shared. If all the values of the binding match, they can be shared, but
> then this should be mentioned in the binding plus it should be used in
> the driver. I don't see your driver patches add include of this header.

Indeed. AFAICT the original raw values 0 and 1 just map directly to the
register bitfield values. And those are common across the series of PMICs.
I'll look into cleaning it up.

ChenYu

> > MT6397 and co refer to their AP PMICs, i.e. PMICs that are companion
> > chips to the SoC and provide most of the power rails a system needs,
> > along with things like RTC, audio codecs, etc.. The MT6358 and MT6366
> > belong to this class.
> >
> > MT6360 and possibly others refer to their charger PMICs, which integrate
> > a battery charger, USB type-C PD stuff, LED drivers, and a handful of
> > regulators.
>
>
> Best regards,
> Krzysztof
>