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Tue, 07 Jul 2026 03:00:20 -0700 (PDT) Message-ID: Date: Tue, 7 Jul 2026 11:00:19 +0100 Precedence: bulk X-Mailing-List: devicetree@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: Konrad Dybcio , 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, Dmitry Baryshkov References: <20260706071113.383215-1-atanas.filipov@oss.qualcomm.com> <68e59764-5a10-4abc-849c-14ea2d9ef76e@linaro.org> <437d1eb0-4495-406a-9501-b0515cfa3151@linaro.org> <8116c54e-4050-4e9d-b236-59d74846bd57@linaro.org> <8a09875d-af5f-438b-b947-bc2b61219b70@oss.qualcomm.com> From: Bryan O'Donoghue Content-Language: en-US In-Reply-To: <8a09875d-af5f-438b-b947-bc2b61219b70@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 07/07/2026 10:24, Konrad Dybcio wrote: > On 7/6/26 3:37 PM, Bryan O'Donoghue wrote: >> On 06/07/2026 14:02, Vladimir Zapolskiy wrote: >>>> >>>> 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. > > They are all subordinate to CAMSS_TOP - Vlad indeed said they are > peers (i.e. there's no co-dependence between them specifically, but > their parent is shared). > > You can't use any of these IP blocks if you don't first power up > TOP because of the physical layout. Yes and I'm asking for TOP to be listed in each of the subordinate nodes for reasons given below. But unlike MDSS - OPE for example doesn't require IFE or CSID to do its job. Over time we can move the bindings to a model where the only thing in CAMSS is a top-level bus like declaration but _right_now_ what you would do is create an artificial dependency on say CSIPHY for JPEG. > This is exactly identical to the MDSS case. > I was hoping this was clear after N other similar threads. When we split IFE, CSID etc up into their own individual nodes it would be possible to model as for argument sake compat = "camss-bus"; power-domains = ; jpeg@x { power-domains = , , ; }; What I'm saying here is do this compat = "camss"; regs = ife, csid; // exisiting bindings for the last ~ 11 years power-domains = ; jpeg@x { power-domains = , , , ; }; Otherwise you create entirely artificial dependencies between IFE, CSIPHY and JPEG, OPE et al. And BTW if/when we get to the camss-bus stage of things having TITAN_TOP_GDSC listed in OPE and JPEG is a very small price to pay. We've already agreed to gradually transition the bindings instead of go for a big-band integration several times. --- bod