arm64: dts: st: add ltdc support on stm32mp255

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Add the LTDC node for stm32mp255 SoC and handle its loopback clocks.

ck_ker_ltdc has the CLK_SET_RATE_PARENT flag.  While having this flag is
semantically correct, it for now leads to an improper setting of the
clock rate.  The ck_ker_ltdc parent clock is the flexgen 27, which does
not support changing rates yet.  To overcome this issue, a fixed clock
can be used for the kernel clock.

Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Acked-by: Yannick Fertre <yannick.fertre@foss.st.com>
Link: https://lore.kernel.org/r/20250822-drm-misc-next-v5-10-9c825e28f733@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

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Raphael Gallais-Pou 2025-08-22 16:34:19 +02:00 • committed by Alexandre Torgue

parent 114e282d51

commit 84b78bc2cb

2 changed files with 12 additions and 0 deletions

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arch/arm64/boot/dts/st/stm32mp251.dtsi

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arch/arm64/boot/dts/st/stm32mp255.dtsi

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