linux-kernel - Re: [PATCH v2 03/12] dt-bindings: i2c: dw: Add Baikal-T1 SoC I2C controller

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Date:   Mon, 18 May 2020 14:33:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Frank Rowand <frowand.list@...il.com>,
        linux-mips@...r.kernel.org, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/12] dt-bindings: i2c: dw: Add Baikal-T1 SoC I2C
 controller

On Sun, May 10, 2020 at 12:50:09PM +0300, Serge Semin wrote:
> Add the "baikal,bt1-sys-i2c" compatible string to the DW I2C binding and
> make sure the reg property isn't required in this case because the
> controller is embedded into the Baikal-T1 System Controller. The rest of
> the DW APB I2C properties are compatible and can be freely used to describe
> the Baikal-T1 I2C controller dts-node.

Is there not a sub-range of the system controller with the I2C 
registers? I'd assume there is, so you can still have 'reg' even if 
Linux doesn't use it (currently).

> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: Paul Burton <paulburton@...nel.org>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Cc: Wolfram Sang <wsa@...-dreams.de>
> Cc: Frank Rowand <frowand.list@...il.com>
> Cc: linux-mips@...r.kernel.org
> 
> ---
> 
> Rob, I had to remove your acked-by tag because of the changes introduced
> in v2 of the patch.
> 
> Changelog v2:
> - Make the reg property being optional if it's Baikal-T1 System I2C DT
>   node.
> ---
>  .../devicetree/bindings/i2c/snps,designware-i2c.yaml | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml b/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml
> index 8d4e5fccbd1c..579964098eb9 100644
> --- a/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml
> +++ b/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml
> @@ -21,6 +21,15 @@ allOf:
>        properties:
>          reg:
>            maxItems: 1
> +  - if:
> +      properties:
> +        compatible:
> +          not:
> +            contains:
> +              const: baikal,bt1-sys-i2c
> +    then:
> +      required:
> +        - reg
>  
>  properties:
>    compatible:
> @@ -31,6 +40,8 @@ properties:
>          items:
>            - const: mscc,ocelot-i2c
>            - const: snps,designware-i2c
> +      - description: Baikal-T1 SoC System I2C controller
> +        const: baikal,bt1-sys-i2c
>  
>    reg:
>      minItems: 1
> @@ -98,7 +109,6 @@ unevaluatedProperties: false
>  
>  required:
>    - compatible
> -  - reg
>    - "#address-cells"
>    - "#size-cells"
>    - interrupts
> -- 
> 2.25.1
>