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The following RK3588 boards expose one or two GPIO pins to control the voltage bias on the HDMI0 and/or HDMI1 data lines: - rk3588-armsom-sige7 - rk3588-armsom-w3 - rk3588-coolpi-cm5-evb - rk3588-coolpi-cm5-genbook - rk3588-evb1-v10 - rk3588-evb2-v10 - rk3588-firefly-itx-3588j - rk3588-friendlyelec-cm3588-nas - rk3588-h96-max-v58 - rk3588-jaguar - rk3588-mnt-reform2 - rk3588-nanopc-t6 - rk3588-orangepi-5-max - rk3588-orangepi-5-plus - rk3588-orangepi-5-ultra - rk3588-roc-rt - rk3588-rock-5-itx - rk3588-rock-5b-5bp-5t - rk3588-tiger The pins must be asserted when operating in HDMI 2.1 FRL mode and deasserted for HDMI 1.4/2.0 TMDS mode. Wire up the hdmi0 and/or hdmi1 nodes to their dedicated GPIO pin(s) via frl-enable-gpios to allow adjusting the bias when transitioning between TMDS and FRL modes. While at it, also ensure that pinctrl-names is present and ordered alphabetically within the hdmi nodes. Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com> Link: https://patch.msgid.link/20260428-dts-rk-frl-enable-gpios-v2-4-924df9db884a@collabora.com Signed-off-by: Heiko Stuebner <heiko@sntech.de>