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

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Message-ID: <66e017401ab93aa02c5d2bbf11be9589b36649ac.camel@mediatek.com>
Date:   Mon, 7 Jun 2021 13:20:43 +0800
From:   Chun-Jie Chen <chun-jie.chen@...iatek.com>
To:     Rob Herring <robh@...nel.org>
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 Wed, 2021-06-02 at 12:12 -0500, Rob Herring wrote:
> 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_wra
> > p.yaml
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,imp_iic_w
> > rap.yaml
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,imp_iic_w
> > rap.yaml
> > new file mode 100644
> > index 000000000000..fb6cb9e60ee2
> > --- /dev/null
> > +++
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,imp_iic_w
> > rap.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

Some module is divided to sub-modules which are designed in different
h/w blocks for different usage, and if we want to use the same
compatible to present these h/w blocks, we need to move the clock data
provided by these h/w blocks to dts, but we usually use different
compatible to get the h/w blocks data in
Mediatek's clock driver, so do you suggest to register clock provided
by different h/w blocks using same compatible?

Best Regards,
Chun-Jie