On some SoCs the HDMI controller does not own its register window. The
StarFive JH7110 documents one 64 KB block, u0_hdmitx, that holds both
the controller and the PHY, so the parent device maps it and owns the
regmap while the two children share it.
Use a regmap supplied by the parent device when there is one, and keep
mapping our own resource when there is not, so platforms that own their
register window are unaffected.
Reviewed-by: Joshua Peisach <redacted>
Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
Sashiko has reviewed this patch and found no issues. It looks great!
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Sashiko AI review · https://sashiko.dev/#/patchset/20260915-jh7110-clean-send-v4-0-f0e4fd6f2cc8@samsung.com?part=8