linux-kernel - Re: [PATCH v2 10/12] dt-bindings: media: fsd: Document CSIS DMA controller

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Message-ID: <66799067-faac-4fe7-9114-4797b93d03c7@kernel.org>
Date: Mon, 25 Aug 2025 14:25:24 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Inbaraj E <inbaraj.e@...sung.com>, mturquette@...libre.com,
 sboyd@...nel.org, robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 s.nawrocki@...sung.com, s.hauer@...gutronix.de, shawnguo@...nel.org,
 cw00.choi@...sung.com, rmfrfs@...il.com, laurent.pinchart@...asonboard.com,
 martink@...teo.de, mchehab@...nel.org, linux-fsd@...la.com, will@...nel.org,
 catalin.marinas@....com, pankaj.dubey@...sung.com, shradha.t@...sung.com,
 ravi.patel@...sung.com
Cc: linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, alim.akhtar@...sung.com,
 linux-samsung-soc@...r.kernel.org, kernel@...i.sm, kernel@...gutronix.de,
 festevam@...il.com, linux-media@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 10/12] dt-bindings: media: fsd: Document CSIS DMA
 controller

On 25/08/2025 14:01, Inbaraj E wrote:
> Hi Krzysztof,
> 
>>> According to the HW design of FSD SoC, the control to manage CSIS
>>> power is given to a separate CPU where custom firmware runs.
>>> Therefore. The Linux side does not control the CSIS power supplies directly
>> and are hence not included in the device tree.
>>
>> Usually this still means you vote for enabling these resources, at least for
>> other vendors it is like that. Unless you want to say these are essentially
>> always on and CANNOT be disabled ever.
> 
> Yes, we want IP to remain enabled permanently, So we are not adding power supply
> control in linux.

Please describe it in the description: part of the binding.

Best regards,
Krzysztof