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

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Message-ID: <015a01dc15b8$1095f0e0$31c1d2a0$@samsung.com>
Date: Mon, 25 Aug 2025 17:31:56 +0530
From: "Inbaraj E" <inbaraj.e@...sung.com>
To: "'Krzysztof Kozlowski'" <krzk@...nel.org>, <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

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.

Regards,
Inbaraj E