linux-kernel - Re: [PATCH 3/4] dt-bindings: soc: samsung: exynos-sysreg: add dedicated SYSREG compatibles to Exynos5433

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Message-ID: <CAPLW+4mWq5Q4Ht1Upx2Xw3fMfNvvSK6fEPbLFru1NLpKHLbKOg@mail.gmail.com>
Date:   Fri, 25 Nov 2022 08:57:12 -0600
From:   Sam Protsenko <semen.protsenko@...aro.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>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        Sriranjani P <sriranjani.p@...sung.com>,
        Chanho Park <chanho61.park@...sung.com>
Subject: Re: [PATCH 3/4] dt-bindings: soc: samsung: exynos-sysreg: add
 dedicated SYSREG compatibles to Exynos5433

On Fri, 25 Nov 2022 at 08:47, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 25/11/2022 15:22, Sam Protsenko wrote:
> > On Fri, 25 Nov 2022 at 05:22, Krzysztof Kozlowski
> > <krzysztof.kozlowski@...aro.org> wrote:
> >>
> >> Exynos5433 has several different SYSREGs, so use dedicated compatibles
> >> for them.
> >>
> >> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> >>
> >> ---
> >>
> >> Cc: Sriranjani P <sriranjani.p@...sung.com>
> >> Cc: Chanho Park <chanho61.park@...sung.com>
> >> Cc: Sam Protsenko <semen.protsenko@...aro.org>
> >> ---
> >
> > Hi Krzysztof,
> >
> > Just curious: what is the rationale for adding those more specific
> > sysregs? AFAIR, e.g. in Exynos850, different SysReg instances have
> > pretty much the same register layout.
> >
>
> On Exynos5433 all these blocks have different registers. Are you saying
> that Exynos850 has four (or more) sysregs which are exactly the same?
> Same registers? Why would they duplicate it?
>

Ah, no, you are right. Just checked it, they are different. Just first
couple of registers are similar between blocks, that's why I memorized
it wrong.

So as I understand, adding those new compatibles follows "describe HW,
not a driver" rule? Because AFAIU, right now it'll fallback to
"syscon" compatible anyway.

> Best regards,
> Krzysztof
>