linux-kernel - Re: [PATCH v3 1/5] media: dt-bindings: add non-pixel property in iris schema

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Message-ID: <45fdf98c-32f7-4b5f-889c-6d2f1fa5fbd6@kernel.org>
Date: Wed, 2 Jul 2025 13:58:23 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
 Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/5] media: dt-bindings: add non-pixel property in iris
 schema

On 02/07/2025 13:55, Vikash Garodia wrote:
> 
> 
> On 7/2/2025 5:17 PM, Krzysztof Kozlowski wrote:
>> On 02/07/2025 13:45, Vikash Garodia wrote:
>>>
>>> On 7/2/2025 4:53 PM, Krzysztof Kozlowski wrote:
>>>> On 27/06/2025 17:48, Vikash Garodia wrote:
>>>>> +
>>>>>      video-codec@...0000 {
>>>>>          compatible = "qcom,sm8550-iris";
>>>>>          reg = <0x0aa00000 0xf0000>;
>>>>> @@ -144,12 +176,16 @@ examples:
>>>>>          resets = <&gcc GCC_VIDEO_AXI0_CLK_ARES>;
>>>>>          reset-names = "bus";
>>>>>  
>>>>> -        iommus = <&apps_smmu 0x1940 0x0000>,
>>>>> -                 <&apps_smmu 0x1947 0x0000>;
>>>>> +        iommus = <&apps_smmu 0x1947 0x0000>;
>>>>
>>>> I missed, that's technically ABI break and nothing in commit msg
>>>> explains that. You need to clearly explain the reasons and impact.
>>> No, it is not. Interface works well with old or new approach.
>>
>>
>> You changed the order of IOMMUs, so yes it is. Which interface works
>> well - FreeBSD? Or other? You are changing ABI for every user.
> Why do i need to change, when without changing would work as well ?
? I don't understand. I made a statement, not a question. You are doing
this - you are changing the ABI.

Which item was the first IOMMU before and which was second?

Which item is the first IOMMU now?

Best regards,
Krzysztof