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Wed, 15 Apr 2026 19:07:54 -0700 (PDT) Date: Wed, 15 Apr 2026 22:08:35 -0400 From: Richard Acayan To: David Heidelberg Cc: Tianshu Qiu , Sakari Ailus , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, phone-devel@vger.kernel.org Subject: Re: [PATCH] media: i2c: imx355: Add support for 24 MHz external clock Message-ID: References: <20260414-imx355-24mhz-v1-1-9ae77bc6e7ec@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: <20260414-imx355-24mhz-v1-1-9ae77bc6e7ec@ixit.cz> On Tue, Apr 14, 2026 at 12:12:10PM +0200, David Heidelberg via B4 Relay wrote: > From: David Heidelberg > > The IMX355 sensor supports multiple external clock frequencies, > including 19.2 MHz and 24 MHz. The driver currently supports only > fixed 19.2 MHz input clock. > > Refactor the clock handling to make the PLL configuration dependent > on the external clock frequency and add support for 24 MHz. Introduce > a table of clock parameter sets and program the corresponding EXTCLK > frequency and PLL multipliers to maintain consistent internal VCO > frequencies across supported inputs. > > The PLL settings are adjusted so that: > - VT VCO remains at 1152 MHz > - OP VCO remains at 720 MHz > > This preserves existing timing characteristics while allowing systems > using a 24 MHz clock to operate correctly. > > No functional change for existing 19.2 MHz users. > > Assisted-by: Claude:claude-opus-4-6 > Signed-off-by: David Heidelberg > --- We are in an open merge window for v7.1-rc1 and there don't seem to be reviews currently, but I tested this revision on v6.19.10. Tested-by: Richard Acayan # Pixel 3a