linux-kernel - Re: [PATCH 2/2] phy: qcom-mipi-csi2: Add a CSI2 MIPI D-PHY driver

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Message-ID: <a7f64b31-4767-4281-b452-a2bc5351d745@mleia.com>
Date: Mon, 14 Jul 2025 17:58:57 +0300
From: Vladimir Zapolskiy <vz@...ia.com>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Bryan O'Donoghue <bod@...nel.org>, linux-arm-msm@...r.kernel.org,
 linux-phy@...ts.infradead.org, linux-media@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] phy: qcom-mipi-csi2: Add a CSI2 MIPI D-PHY driver

On 7/14/25 17:43, Bryan O'Donoghue wrote:
> On 14/07/2025 15:16, Vladimir Zapolskiy wrote:
>>> +#define DEBUG
>>
>> Still under debugging?..
> 
> oops thanks.
> 
>> Well, the phy should be a multimedia device, and this driver is not
>> the one, thus you can not use it to connect sensors and put the IP
>> into a media pipeline.
> Ah no, I don't agree.
> Please see my previous email.
> 

I believe there is very little room to disagree...

This proposed device node scheme does not solve the known and already
discussed technical issue expectedly, namely there is no given way
to describe a combo mode hardware configuration, when two independant
sensors are wired to the same CSIPHY. This is an unsolvable problem
with this design.

Sensors are conneced to CSIPHY IP blocks, CSIPHY is connected to CSID.

--
Best wishes,
Vladimir