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:   Tue, 8 Jun 2021 16:45:49 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Chun-Jie Chen <chun-jie.chen@...iatek.com>,
        Rob Herring <robh@...nel.org>
Cc:     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 07/06/2021 07:20, Chun-Jie Chen wrote:
> 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?
> 

The mapping of them is as following:
imp_iic_wrap_c:  11007000
imp_iic_wrap_e:  11cb1000
imp_iic_wrap_s:  11d03000
imp_iic_wrap_ws: 11d23000
imp_iic_wrap_w:  11e01000
imp_iic_wrap_n:  11f02000

Regards,
Matthias