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Mon, 30 Mar 2026 18:27:23 -0700 (PDT) Date: Mon, 30 Mar 2026 21:27:59 -0400 From: Richard Acayan To: Sakari Ailus Cc: David Heidelberg , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Robert Foss , Todor Tomov , Bryan O'Donoghue , Vladimir Zapolskiy , Bjorn Andersson , Konrad Dybcio , Tianshu Qiu , Robert Mader , phone-devel@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-media@vger.kernel.org Subject: Re: [PATCH v9 7/7] arm64: dts: qcom: sdm670-google-sargo: add imx355 front camera Message-ID: References: <20260217002738.133534-1-mailingradian@gmail.com> <20260217002738.133534-8-mailingradian@gmail.com> <1349f725-a20f-4935-a829-208c8e583ad9@ixit.cz> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Mar 24, 2026 at 12:57:59PM +0200, Sakari Ailus wrote: > Hi David, Richard, > > On Tue, Mar 24, 2026 at 10:35:24AM +0100, David Heidelberg wrote: > > > > > > On 24/03/2026 03:05, Richard Acayan wrote: > > > On Fri, Mar 13, 2026 at 07:26:47PM +0100, David Heidelberg wrote: > > > > On 17/02/2026 01:27, Richard Acayan wrote: > > > > [...] > > > > > > > > > +&cci_i2c1 { > > > > > + camera@1a { > > > > > + compatible = "sony,imx355"; > > > > > + reg = <0x1a>; > > > > > + > > > > > + clocks = <&camcc CAM_CC_MCLK2_CLK>; > > > > > + > > > > > + assigned-clocks = <&camcc CAM_CC_MCLK2_CLK>; > > > > > + assigned-clock-rates = <19200000>; > > > > > > > > Extract from #sdm670-mainline:erebion.eu discussion: > > > > The imx355 can operate on 24 MHz (on both Pixel 3 and 3a), but Linux kernel > > > > driver can operate only with 19.2 MHz. > > > > > > > > I assume it would be worth it mention at least by comment here. > > > > > > This might set the series back because the devicetree isn't meant to be > > > written for specific software, but it's included in v11 because you > > > already asked twice. > > > > > > > I would say node with lower clock frequency is still much better than > > nothing or placeholder saying "i2c camera here". Instead we'll have small > > placeholder that value can be bumped to 24 MHz. Important is this can be > > easily improved when at least one consumer of the device-tree gains support. > > > > We have very scarce support of cameras on mobile phones in mainline, thus > > leaving a comment that HW can do 24 MHz is reasonable compromise IMHO. > > The bindings could document the supported frequency range. > > In DTS it may make sense to set the frequency the vendor uses as it may > affect the link frequencies (albeit I guess they're the same in this > case?). Is this review relevant to v11?