linux-kernel - Re: [PATCH 4/4] dt-bindings: soc: samsung: exynos-sysreg: add clocks for Exynos850

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Message-ID: <CAPLW+4nSLP4ZpnzYrOfMu0uOQ0OYnWsnZ=sUppxts6O_3-yYZg@mail.gmail.com>
Date:   Fri, 25 Nov 2022 08:38:11 -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 4/4] dt-bindings: soc: samsung: exynos-sysreg: add clocks
 for Exynos850

On Fri, 25 Nov 2022 at 05:22, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> Exynos850 has dedicated clock for accessing SYSREGs.  Allow it, even
> though Linux currently does not enable them and relies on bootloader.
>

Not sure if this description is correct. Of course, there is no driver
for "samsung,exynos850-sysreg" compatible at the moment, so the next
compatible from the list ("syscon") is used for Exynos850. And
"syscon" driver (drivers/mfd/syscon.c) actually does control the
clocks. I remember adding "clocks" property to Exynos850 dts to fix
actual problem. Also, the "clocks" property is not described in
Documentation/devicetree/bindings/mfd/syscon.yaml, didn't really check
if it's ok or it's just missing.

Other than that comment:

Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>

> 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>
> ---
>  .../soc/samsung/samsung,exynos-sysreg.yaml        | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml b/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml
> index 42357466005e..27cea934a286 100644
> --- a/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml
> +++ b/Documentation/devicetree/bindings/soc/samsung/samsung,exynos-sysreg.yaml
> @@ -36,10 +36,25 @@ properties:
>    reg:
>      maxItems: 1
>
> +  clocks:
> +    maxItems: 1
> +
>  required:
>    - compatible
>    - reg
>
> +allOf:
> +  - if:
> +      not:
> +        properties:
> +          compatible:
> +            contains:
> +              enum:
> +                - samsung,exynos850-sysreg
> +    then:
> +      properties:
> +        clocks: false
> +
>  additionalProperties: false
>
>  examples:
> --
> 2.34.1
>