Re: [PATCH] arm64: dts: imx8mp: Clarify csis clock frequency

Shawn Guo
2024-08-31T13:16:08Z

On Wed, Aug 14, 2024 at 02:40:10AM +0300, Laurent Pinchart wrote:
> The DT nodes for the MIPI CSI-2 receivers (MIPI_CSI) configure the
> CAM1_PIX and CAM2_PIX clocks to 266 MHz through the assigned-clock-rates
> property, and report that frequency in the clock-frequency property. The
> i.MX8MP reference manual and datasheet list 266 MHz as a nominal
> frequency when using both CSI-2 receivers, so all looks normal.
>
> In reality, the clock is actually set to 250 MHz, as the selected
> parent, IMX8MP_SYS_PLL2_1000M, has a 1/4 output that is selected as the
> closest frequency to 266 MHz. This doesn't break operation of the
> device, but is clearly misleading.
>
> Clarify the clock configuration by selecting the IMX8MP_SYS_PLL2_250M
> parent, dropping the redundant assigned-clock-rates, and setting
> clock-frequency to 250 MHz. This doesn't cause any functional change.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Applied, thanks!