linux-kernel - Re: [PATCH v9 01/22] dt-bindings: ARM: Mediatek: Add new document bindings of imp i2c wrapper controller

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Date:   Wed, 2 Jun 2021 12:12:01 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chun-Jie Chen <chun-jie.chen@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, srv_heupstream@...iatek.com,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Weiyi Lu <weiyi.lu@...iatek.com>
Subject: Re: [PATCH v9 01/22] dt-bindings: ARM: Mediatek: Add new document
 bindings of imp i2c wrapper controller

On Mon, May 24, 2021 at 08:20:32PM +0800, Chun-Jie Chen wrote:
> This patch adds the new binding documentation of imp i2c wrapper controller
> for Mediatek MT8192.
> 
> Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
> Signed-off-by: chun-jie.chen <chun-jie.chen@...iatek.com>
> ---
>  .../arm/mediatek/mediatek,imp_iic_wrap.yaml   | 80 +++++++++++++++++++
>  1 file changed, 80 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,imp_iic_wrap.yaml
> 
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,imp_iic_wrap.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,imp_iic_wrap.yaml
> new file mode 100644
> index 000000000000..fb6cb9e60ee2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,imp_iic_wrap.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/mediatek/mediatek,imp_iic_wrap.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek IMP I2C Wrapper Controller
> +
> +maintainers:
> +  - Chun-Jie Chen <chun-jie.chen@...iatek.com>
> +
> +description:
> +  The Mediatek imp i2c wrapper controller provides functional configurations and clocks to the system.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - mediatek,mt8192-imp_iic_wrap_c
> +          - mediatek,mt8192-imp_iic_wrap_e
> +          - mediatek,mt8192-imp_iic_wrap_s
> +          - mediatek,mt8192-imp_iic_wrap_ws
> +          - mediatek,mt8192-imp_iic_wrap_w
> +          - mediatek,mt8192-imp_iic_wrap_n

Looks to me like these are all the same h/w, but just have differing 
sets of clocks. That's not really a reason to have different 
compatibles. 

If you need to know what clocks are present, you can walk the DT for 
all 'clocks' properties matching this clock controller instance. Or use 
'clock-indices' to define which ones are present.

Rob