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The driver for the Rockchip MIPI CSI-2 DPHY uses GRF register offset value 0 to sort out undefined registers. However, the RK3588 CSIDPHY GRF this offset is perfectly fine (in fact, register 0 is the only one in this register file). Introduce a boolean variable to indicate valid registers and allow writes to register 0. Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Signed-off-by: Michael Riesch <michael.riesch@collabora.com> Link: https://lore.kernel.org/r/20250616-rk3588-csi-dphy-v4-4-a4f340a7f0cf@collabora.com Signed-off-by: Vinod Koul <vkoul@kernel.org>