linux-kernel - Re: [PATCH v5 5/7] media: qcom: camss: Add support for named power-domains

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Date:   Thu, 23 Nov 2023 13:42:51 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, Robert Foss <rfoss@...nel.org>,
        Todor Tomov <todor.too@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        matti.lehtimaki@...il.com, quic_grosikop@...cinc.com
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 5/7] media: qcom: camss: Add support for named
 power-domains

On 23/11/2023 11:49, Konrad Dybcio wrote:
> 
> 
> On 11/22/23 21:55, Bryan O'Donoghue wrote:
>> On 22/11/2023 19:55, Konrad Dybcio wrote:
>>>
>>>
>>> On 11/18/23 13:11, Bryan O'Donoghue wrote:
>>>> Right now we use fixed indexes to assign power-domains, with a
>>>> requirement for the TOP GDSC to come last in the list.
>>>>
>>>> Adding support for named power-domains means the declaration in the 
>>>> dtsi
>>>> can come in any order.
>>>>
>>>> After this change we continue to support the old indexing - if a SoC
>>>> resource declaration or the in-use dtb doesn't declare power-domain 
>>>> names
>>>> we fall back to the default legacy indexing.
>>>>
>>>>  From this point on though new SoC additions should contain named
>>>> power-domains, eventually we will drop support for legacy indexing.
>>>>
>>>> Tested-by: Matti Lehtimäki <matti.lehtimaki@...il.com>
>>>> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>>>> ---
>>> So, this commit should be a NOP within this series?
>>>
>>> res->pd_name isn't defined anywhere afaics
>>>
>>> Konrad
>>
>> This series is mergeable though the linux-media tree standalone, yes.
>>
>> Once merged, the dtsi change given in the cover letter will be submitted.
> What I meant to say is that something similar to [1] is missing to
> make use of the infra introduced with this patch.
> 
> Konrad
> 
> [1] 
> https://git.codelinaro.org/bryan.odonoghue/kernel/-/commit/f43942091c01c1f263a6e7adbcd0ed8ce723a303

Yeah, to be honest I debated with myself whether or not to include that 
patch since once defined the code here will execute looking for named pd.

I'm not opposed to sending a v6 to include this additional change 
though, I've thoroughly tested on rb5.

---
bod