linux-kernel - Re: [PATCH v2 05/29] dt-bindings: soc: realtek: rtd1195-chip: Add iso-syscon property

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Date:   Mon, 13 Jul 2020 20:13:58 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andreas Färber <afaerber@...e.de>
Cc:     linux-realtek-soc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        James Tai [戴志峰] <james.tai@...ltek.com>,
        Stanley Chang [昌育德] 
        <stanley_chang@...ltek.com>, Edgar Lee <cylee12@...ltek.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 05/29] dt-bindings: soc: realtek: rtd1195-chip: Add
 iso-syscon property

On Tue, Jun 23, 2020 at 04:50:42AM +0200, Andreas Färber wrote:
> Allow to optionally specify a phandle to iso syscon to identify the chip.
> RTD1295 family will want to check the ISO_CHIP_INFO1 register.
> 
> Signed-off-by: Andreas Färber <afaerber@...e.de>
> ---
>  A SoC specific binding would defeat the purpose of the generic Linux driver
>  detecting the SoC based on registers.
>  Simply allowing it all for SoC families seems the most flexible.
>  
>  v1 -> v2:
>  * Instead of extending reg, allow optional iso-syscon property for RTD129x.
>    Iso syscon currently does not have a compatible, and it may need to differ
>    across SoC families.
>  
>  .../bindings/soc/realtek/realtek,rtd1195-chip.yaml       | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml b/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml
> index 86a1de214782..dfe33c95f68d 100644
> --- a/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml
> +++ b/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml
> @@ -11,6 +11,7 @@ maintainers:
>  
>  description: |
>    The Realtek DHC SoCs have some registers to identify the chip and revision.
> +  To identify the exact model within a family, further registers are needed.
>  
>  properties:
>    compatible:
> @@ -19,6 +20,8 @@ properties:
>    reg:
>      maxItems: 1
>  
> +  iso-syscon: true

Needs a type $ref (phandle).

> +
>  required:
>    - compatible
>    - reg
> @@ -31,4 +34,10 @@ examples:
>          compatible = "realtek,rtd1195-chip";
>          reg = <0x1801a200 0x8>;
>      };
> +  - |
> +    chip-info@...1a200 {
> +        compatible = "realtek,rtd1195-chip";
> +        reg = <0x9801a200 0x8>;
> +        iso-syscon = <&iso>;
> +    };
>  ...
> -- 
> 2.26.2
>