When adding support for A64 HDMI PHY in 4.19, we assumed that the two PLL-VIDEOs can both feed the HDMI PHY clock. However experiments show that the mux bit discovered in R40 blob is not applicable on A64. This is not discovered, as normally with a single display pipeline only PLL-VIDEO0 will be used.
In this patchset the second PLL is dropped, and a binding specially for R40 HDMI PHY is added (which seems to have the mux).
PATCH 1 and 2 are dropping second PLL for A64 HDMI PHY, and PATCH 3 to 5 are adding R40 HDMI PHY binding.
This patchset targets v4.19 fixes tree, because the binding is introduced in v4.19, and if we don't fix it there a wrong binding will be left in a stable version released.
Icenowy Zheng (5): dt-bindings: sun4i-drm: drop second PLL from A64 HDMI PHY binding drm: sun4i: drop second PLL from A64 HDMI PHY dt-bindings: sun4i-drm: add compatible for R40 HDMI PHY drm/sun4i: add support for R40 HDMI PHY ARM: sun8i: dts: drop A64 HDMI PHY fallback compatible from R40 DT
.../devicetree/bindings/display/sunxi/sun4i-drm.txt | 5 +++-- arch/arm/boot/dts/sun8i-r40.dtsi | 3 +-- drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 13 ++++++++++++- 3 files changed, 16 insertions(+), 5 deletions(-)