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Mon, 06 Jul 2026 06:37:55 -0700 (PDT) Message-ID: <8116c54e-4050-4e9d-b236-59d74846bd57@linaro.org> Date: Mon, 6 Jul 2026 14:37:54 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 0/5] Add Qualcomm JPEG V4L2 encoder for SM8250 To: Vladimir Zapolskiy , Atanas Filipov , linux-media@vger.kernel.org Cc: loic.poulain@oss.qualcomm.com, mchehab@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, andersson@kernel.org, konradybcio@kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20260706071113.383215-1-atanas.filipov@oss.qualcomm.com> <68e59764-5a10-4abc-849c-14ea2d9ef76e@linaro.org> <437d1eb0-4495-406a-9501-b0515cfa3151@linaro.org> From: Bryan O'Donoghue Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 06/07/2026 14:02, Vladimir Zapolskiy wrote: >>> >>> Why? The common power domain and interconnects have already been >>> described as resources of the parent CAMSS device, there is no need >>> to duplicate descriptions in every child device tree node of CAMSS. >> >> CSID, IFE etc are not parents of the JPEG encoder. >> >> The idea is to make all of these peers, eventually. Not particular block >> owns the TITAN_TOP_GDSC - the entire CAMSS block is a collapsible block. >> > > The statement provides the same information as before, e.g. it's found > here: > > https://lore.kernel.org/linux-media/fbc018f5- > c025-4747-85f2-53b45b0f0496@nxsw.ie/ > >     There's no functional linkage between CAMSS/IFE and JPEG - they are >     peers within the CAMSS power-island. > > Thus "the CAMSS power-island" exists, and it got its hardware description > as the CAMSS top device tree node, and TITAN_TOP_GDSC power domain is > a natural resource of all devices on "CAMSS power-island", Vlad honestly, TITAN_TOP_GDSC is provided to the CAMSS island - all of the nodes within it depend on that and it is _external_ to the block. There is a CSID MUX on some SOC other than that I'll restate it again, I'm not sure why you won't accept it. There is no dependency between JPEG and IFE, one is _not_ subordinate to the other and trying to find ways to invalidate that statement runs counter to the facts. CAMCC provides TITAN_TOP_GDSC external to the CAMSS block, that GDSC effectively _is_ the power island. This debate is going nowhere. Check the downstream you don't need the docs titan_top_gdsc is provided by CAMCC. --- bod