linux-kernel - Re: [PATCH 04/13] media: qcom: camss: csiphy: Add an init callback to CSI PHY devices

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Message-ID: <8f935a7d-87b5-479c-a98e-c95671dbe259@linaro.org>
Date: Wed, 7 Aug 2024 15:04:48 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Depeng Shao <quic_depengs@...cinc.com>,
 Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>, rfoss@...nel.org,
 todor.too@...il.com, mchehab@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org
Cc: quic_eberman@...cinc.com, linux-media@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel@...cinc.com
Subject: Re: [PATCH 04/13] media: qcom: camss: csiphy: Add an init callback to
 CSI PHY devices

On 07/08/2024 14:08, Depeng Shao wrote:
> Hi Vladimir,
> 
> On 8/5/2024 5:26 AM, Vladimir Zapolskiy wrote:
>> Hi Bryan,
>>
>> On 8/1/24 11:16, Bryan O'Donoghue wrote:
>>> On 01/08/2024 00:43, Vladimir Zapolskiy wrote:
>>>>> +    ret = csiphy->res->hw_ops->init(csiphy);
>>>>
>>>> Here.
>>>
>>> What name would make more sense to you ?
>>
>> according to the implementation the .init() call just fills some data in
>> memory, so I believe this could be handled at build time, if it's done
>> carefully enough...
>>
> 
> This camss-csiphy-3ph-1-0.c is reused by many platforms, the old 
> platforms have same CSI_COMMON_CTR register offset, their offset are 
> 0x800, but some new platforms may have different CSI_COMMON_CTR register 
> offset, for example, the CSI_COMMON_CTR register offset is 0x1000 in 
> sm8550, then we need to add new file to support the new csiphy HW, e.g., 
> camss-csiphy-3ph-2-0.c, so Bryan asked me to develop the CSIPHY driver 
> based on his changes, then we just need few code to enable new CSIPHY.
> 
> Regarding the hw_ops->init interface, since it fills HW register 
> configurations and HW register offset, then maybe, it also can be called 
> as HW operation.
> 
> And looks like we can't move it to camss-csiphy.c since it does platform 
> specific operation and it is related to the registers.
> 
> Please feel free to share other comments if you don't agree with it. 
> Thanks.
> 
> 
> Thanks,
> Depeng

So, I agree the phy init data could be obtained via resource structs 
but, rather than add yet more patches to this series, I'd say we can 
make the move to a separate resource struct pointer at a later date.

Lets drop this patch and @Depeng we can then do

+	regs->offset = 0x800;

media: qcom: camss: csiphy-3ph: Use an offset variable to find common 
control regs

As a bonus that's one less patch for this series which @ 13 patches is 
already large.

---
bod