linux-kernel - Re: [PATCH v2 5/5] media: qcom: camss: Add support for named power-domains

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Message-ID: <5a6ba550-6115-47ab-b724-5e29d64a1b2e@linaro.org>
Date:   Tue, 31 Oct 2023 11:38:18 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        hverkuil-cisco@...all.nl, laurent.pinchart@...asonboard.com,
        rfoss@...nel.org, todor.too@...il.com, andersson@...nel.org,
        mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/5] media: qcom: camss: Add support for named
 power-domains

On 31/10/2023 10:53, Konrad Dybcio wrote:
> On 26.10.2023 17:50, 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 declration 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.
>>
>> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>> ---
>>   drivers/media/platform/qcom/camss/camss-vfe.c | 24 ++++++++++++++++-
>>   drivers/media/platform/qcom/camss/camss.c     | 26 +++++++++++++++----
>>   drivers/media/platform/qcom/camss/camss.h     |  2 ++
>>   3 files changed, 46 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
>> index ebd5da6ad3f2f..cb48723efd8a0 100644
>> --- a/drivers/media/platform/qcom/camss/camss-vfe.c
>> +++ b/drivers/media/platform/qcom/camss/camss-vfe.c
>> @@ -1381,7 +1381,29 @@ int msm_vfe_subdev_init(struct camss *camss, struct vfe_device *vfe,
>>   	if (!res->line_num)
>>   		return -EINVAL;
>>   
>> -	if (res->has_pd) {
>> +	/* Power domain */
> Unnecessary, I think
> 

Consistent with existing commentary in this function ->

/* Memory */

/* Interrupts */

>> +
>> +	if (res->pd_name) {
> No need to nullcheck, dev_pm_domain_attach_by_name seems to return
> NULL when the name is NULL

It looks so. Then again I'm sure checking here saves a few instructions 
and stack operations..

---
bod