linux-kernel - Re: [PATCH v1 1/2] dt-bindings: i2c: exynos5: Add samsung,exynos8895-hsi2c compatible

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Message-ID: <17fbfcdd-8b79-4907-a4c8-798da0ef0526@gmail.com>
Date: Tue, 17 Dec 2024 11:31:30 +0200
From: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Andi Shyti
 <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: i2c: exynos5: Add
 samsung,exynos8895-hsi2c compatible

On 12/17/24 11:26, Krzysztof Kozlowski wrote:
> On 17/12/2024 10:08, Ivaylo Ivanov wrote:
>>>>>>        - items:
>>>>>>            - enum:
>>>>>> @@ -94,9 +95,28 @@ allOf:
>>>>>>          - clock-names
>>>>>>  
>>>>>>      else:
>>>>>> -      properties:
>>>>>> -        clocks:
>>>>>> -          maxItems: 1
>>>>>> +      if:
>>>>>> +        properties:
>>>>>> +          compatible:
>>>>>> +            contains:
>>>>>> +              enum:
>>>>>> +                - samsung,exynos8895-hsi2c
>>>>>> +
>>>>>> +      then:
>>>>>> +        properties:
>>>>>> +          clocks:
>>>>> Missing minItems
>>>>>
>>>>>> +            maxItems: 2
>>>>>> +
>>>>>> +          clock-names:
>>>>> Ditto
>>>>>
>>>>>> +            maxItems: 2
>>>>>> +
>>>>>> +        required:
>>>>>> +          - clock-names
>>>>> I don't understand why do you need second, same branch in if, basically
>>>> Because, as I stated in the commit message, we have HSI2C controllers
>>>> both implemented in USIv1 blocks and outside. These that are a part of
>>> On Exynos8895? Where? With the same compatible?
>> hsi2c_0 which has a clock from BUSC and hsi2c_1 to hsi2c_4 which use clocks
>> from PERIC1 (CLK_GOUT_PERIC1_HSI2C_CAM{0,1,2,3}_IPCLK). Why would
>> they need a different compatible though? It's functionally the same i2c design
>> as the one implemented in USIv1 blocks.
> If one block is part of USI and other not, they might not be the same
> I2C blocks, even if interface is similar. If they were the same or even
> functionally the same, they would have the same clock inputs. However

I see, so in such case I should make samsung,exynos8895-hsi2c-nonusi or
something like that?

> user manual also suggests that there is only one clock, not two (for
> both cases), so they could be functionally equivalent but then number of
> clocks looks incorrect.

That'd be weird. Both according to downstream and upstream clk driver,
for the USI-implemented i2cs we have a pclk and an sclk_usi.

Best regards,
Ivo.

>
> Best regards,
> Krzysztof