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

[Rob Herring <robh@kernel.org>]

On Sun, Feb 20, 2022 at 11:53:12AM +0800, Tyrone Ting wrote:
> From: Tyrone Ting <kfting@nuvoton.com>
> 
> Add compatible and nuvoton,sys-mgr description for NPCM i2c module.
> 
> Signed-off-by: Tyrone Ting <kfting@nuvoton.com>
> Signed-off-by: Tali Perry <tali.perry1@gmail.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@gmail.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