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arm64: dts: rockchip: Add frl-enable-gpios to rk3576-nanopi-r76s

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The board exposes the GPIO4_C6 pin to control the voltage bias on the
HDMI data lines.  It must be asserted when operating in HDMI 2.1 FRL
mode and deasserted for HDMI 1.4/2.0 TMDS mode.

Wire up the hdmi node to its dedicated GPIO via frl-enable-gpios to
allow adjusting the bias when transitioning between TMDS and FRL modes.

Additionally, drop the now unnecessary workaround of using vcc5v_hdmi_tx
as hdmi-pwr-supply solely to drive the GPIO into its default state.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://patch.msgid.link/20260428-dts-rk-frl-enable-gpios-v2-3-924df9db884a@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Cristian Ciocaltea 2026-04-28 00:57:21 +03:00 committed by Heiko Stuebner
parent 12eb09ee67
commit ba0d7cfb98
1 changed files with 3 additions and 13 deletions
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16
arch/arm64/boot/dts/rockchip/rk3576-nanopi-r76s.dts
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@ -70,7 +70,6 @@ led-2 {
hdmi-con {
compatible = "hdmi-connector";
hdmi-pwr-supply = <&vcc5v_hdmi_tx>;
type = "a";
port {
@ -109,18 +108,6 @@ vcc5v_dcin: regulator-vcc5v-dcin {
regulator-name = "vcc5v_dcin";
};
vcc5v_hdmi_tx: regulator-vcc5v-hdmi-tx {
compatible = "regulator-fixed";
enable-active-high;
gpios = <&gpio4 RK_PC6 GPIO_ACTIVE_HIGH>;
pinctrl-names = "default";
pinctrl-0 = <&hdmi_tx_on_h>;
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-name = "vcc5v_hdmi_tx";
vin-supply = <&vcc5v0_sys_s5>;
};
vcc5v0_device_s0: regulator-vcc5v0-device-s0 {
compatible = "regulator-fixed";
regulator-always-on;
@ -252,6 +239,9 @@ &gpu {
};
&hdmi {
frl-enable-gpios = <&gpio4 RK_PC6 GPIO_ACTIVE_LOW>;
pinctrl-0 = <&hdmi_txm0_pins &hdmi_tx_scl &hdmi_tx_sda &hdmi_tx_on_h>;
pinctrl-names = "default";
status = "okay";
};