linux-kernel - Re: [PATCH v2 02/11] dt-bindings: i2c: npcm: support NPCM845

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Message-ID: <YhUj3uRQinOVF4eM@robh.at.kernel.org>
Date:   Tue, 22 Feb 2022 11:56:46 -0600
From:   Rob Herring <robh@...nel.org>
To:     Tyrone Ting <warp5tw@...il.com>
Cc:     avifishman70@...il.com, tmaimon77@...il.com, tali.perry1@...il.com,
        venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
        krzysztof.kozlowski@...onical.com, semen.protsenko@...aro.org,
        yangyicong@...ilicon.com, wsa@...nel.org, jie.deng@...el.com,
        sven@...npeter.dev, bence98@....bme.hu,
        christophe.leroy@...roup.eu, lukas.bulwahn@...il.com,
        olof@...om.net, arnd@...db.de, digetx@...il.com,
        andriy.shevchenko@...ux.intel.com, tali.perry@...oton.com,
        Avi.Fishman@...oton.com, tomer.maimon@...oton.com,
        KWLIU@...oton.com, JJLIU0@...oton.com, kfting@...oton.com,
        openbmc@...ts.ozlabs.org, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 02/11] dt-bindings: i2c: npcm: support NPCM845

On Sun, Feb 20, 2022 at 11:53:12AM +0800, Tyrone Ting wrote:
> From: Tyrone Ting <kfting@...oton.com>
> 
> Add compatible and nuvoton,sys-mgr description for NPCM i2c module.
> 
> Signed-off-by: Tyrone Ting <kfting@...oton.com>
> Signed-off-by: Tali Perry <tali.perry1@...il.com>
> ---
>  .../bindings/i2c/nuvoton,npcm7xx-i2c.yaml       | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/nuvoton,npcm7xx-i2c.yaml b/Documentation/devicetree/bindings/i2c/nuvoton,npcm7xx-i2c.yaml
> index 128444942aec..809c51ac32fe 100644
> --- a/Documentation/devicetree/bindings/i2c/nuvoton,npcm7xx-i2c.yaml
> +++ b/Documentation/devicetree/bindings/i2c/nuvoton,npcm7xx-i2c.yaml
> @@ -7,17 +7,18 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
>  title: nuvoton NPCM7XX I2C Controller Device Tree Bindings
>  
>  description: |
> -  The NPCM750x includes sixteen I2C bus controllers. All Controllers support
> -  both master and slave mode. Each controller can switch between master and slave
> -  at run time (i.e. IPMB mode). Each controller has two 16 byte HW FIFO for TX and
> -  RX.
> +  I2C bus controllers of the NPCM series support both master and
> +  slave mode. Each controller can switch between master and slave at run time
> +  (i.e. IPMB mode). HW FIFO for TX and RX are supported.
>  
>  maintainers:
>    - Tali Perry <tali.perry1@...il.com>
>  
>  properties:
>    compatible:
> -    const: nuvoton,npcm750-i2c
> +     enum:
> +      - nuvoton,npcm750-i2c
> +      - nuvoton,npcm845-i2c
>  
>    reg:
>      maxItems: 1
> @@ -36,11 +37,16 @@ properties:
>      default: 100000
>      enum: [100000, 400000, 1000000]
>  
> +  nuvoton,sys-mgr:
> +    $ref: "/schemas/types.yaml#/definitions/phandle"
> +    description: The phandle of system manager register node.
> +
>  required:
>    - compatible
>    - reg
>    - interrupts
>    - clocks
> +  - nuvoton,sys-mgr

You can't make nuvoton,sys-mgr required for existing users. You can add 
an if/then schema for nuvoton,npcm845-i2c if you want to make it 
required in that case.

Rob