linux-kernel - Re: [PATCH 2/2] dt-bindings: iio: adc: mediatek,mt2701-auxadc: new 32k clock

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Date:   Thu, 20 Oct 2022 10:28:02 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Daniel Golle <daniel@...rotopia.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-iio@...r.kernel.org
Cc:     Gwendal Grignou <gwendal@...omium.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: iio: adc: mediatek,mt2701-auxadc: new
 32k clock

Il 19/10/22 16:38, Daniel Golle ha scritto:
> Newer MediaTek SoCs need an additional clock to be brought up for
> AUXADC to work. Add this new optional clock to
> mediatek,mt2701-auxadc.yaml.
> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
>   .../bindings/iio/adc/mediatek,mt2701-auxadc.yaml          | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml b/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml
> index 7f79a06e76f596..c2a1813dd54152 100644
> --- a/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml
> +++ b/Documentation/devicetree/bindings/iio/adc/mediatek,mt2701-auxadc.yaml
> @@ -44,10 +44,14 @@ properties:
>       maxItems: 1
>   
>     clocks:
> -    maxItems: 1
> +    maxItems: 2
> +    minItems: 1
>   
>     clock-names:
> -    const: main
> +    items:
> +      - const: main
> +      - const: 32k

You're adding this for MT7986, and I don't see any 32KHz ADC clock on that SoC.
I suppose that your '32k' clock is CLK_INFRA_ADC_FRC_CK, currently parented to
'csw_f26m_sel', so that's 26MHz, not 32KHz.

Since you'll need the same changes for thermal as well, I would consider setting
"infra_adc_frc" as a parent of "infra_adc_26m", like so:

	GATE_INFRA1(CLK_INFRA_ADC_26M_CK, "infra_adc_26m", "infra_adc_frc", 20),
	GATE_INFRA1(CLK_INFRA_ADC_FRC_CK, "infra_adc_frc", "csw_f26m_sel", 21),

...just because there's apparently no reason to have one of them enabled but not
the other or, at least, it looks like we *always* need ADC_26M_CK enabled when
ADC_FRC_CK is enabled.

Regards,
Angelo