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[91.159.24.186]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5aed13bb3aasm2833601e87.53.2026.07.06.06.02.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Jul 2026 06:02:22 -0700 (PDT) Message-ID: Date: Mon, 6 Jul 2026 16:02:21 +0300 Precedence: bulk X-Mailing-List: linux-media@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: Bryan O'Donoghue , 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: Vladimir Zapolskiy In-Reply-To: <437d1eb0-4495-406a-9501-b0515cfa3151@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7/6/26 15:11, Bryan O'Donoghue wrote: > On 06/07/2026 13:00, Vladimir Zapolskiy wrote: >>> There is no "master" device in this block of devices - save perhaps for >>> the CSID mux / wrappers on some of these parts. >>> >>> We have shared resources like camera noc, system noc and external clocks. >>> >>> Please include power-domains and interconnects. >>> >> >> 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", including the ones got their description inline CAMSS device tree node or children nodes. There is a difference between 1 point of resource description and N points of resource descriptions, the latter one is more complex and error prone, therefore I belive it shall be disregarded in favour of the former option. -- Best wishes, Vladimir