linux-kernel - Re: [PATCH 03/25] dt-bindings: iio: adc: exynos-adc: do not require syscon on S5Pv210

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Message-ID: <BN6PR04MB06601B8D0B7F1E51953024E6CB280@BN6PR04MB0660.namprd04.prod.outlook.com>
Date:   Mon, 7 Sep 2020 14:49:49 -0700
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH 03/25] dt-bindings: iio: adc: exynos-adc: do not require
 syscon on S5Pv210

Looking at this again, it appears that there is actually control for
it at offset 0x6818 of pmu_syscon (0xe0108000) [1].  However, it defaults to
enabled so it's not required for proper use of the block.  Whether it should
be present in the schema/DTS is up to you.

Thanks,
Jonathan

[1] https://android.googlesource.com/kernel/samsung/+/refs/heads/android-samsung-3.0-jb-mr0/arch/arm/mach-s5pv210/include/mach/regs-clock.h#325

On 2020-09-07 9:11 a.m., Krzysztof Kozlowski wrote:
> The ADC in S5Pv210 does not have ADC phy registers in separate block for
> which syscon would be needed.  Remove this requirement to fix dtbs_check
> warnings like:
> 
>   arch/arm/boot/dts/s5pv210-fascinate4g.dt.yaml: adc@...00000: 'samsung,syscon-phandle' is a required property
> 
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  .../devicetree/bindings/iio/adc/samsung,exynos-adc.yaml          | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml b/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml
> index 89b4f9c252a6..75174af72288 100644
> --- a/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/samsung,exynos-adc.yaml
> @@ -81,7 +81,6 @@ allOf:
>                - samsung,exynos-adc-v2
>                - samsung,exynos3250-adc
>                - samsung,exynos4212-adc
> -              - samsung,s5pv210-adc
>      then:
>        required:
>          - samsung,syscon-phandle
>