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arm64: dts: rockchip: Add frl-enable-gpios to rk3576-luckfox-core3576

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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, remove the now unnecessary workaround of using
vcc_5v0_hdmi as hdmi-pwr-supply solely to drive the GPIO into its
default state.

Also rename the hdmi_con_en pinctrl to hdmi_tx_on_h to match the
schematic naming.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://patch.msgid.link/20260428-dts-rk-frl-enable-gpios-v2-2-924df9db884a@collabora.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Cristian Ciocaltea 2026-04-28 00:57:20 +03:00 committed by Heiko Stuebner
parent 2cd97880fb
commit 12eb09ee67
1 changed files with 4 additions and 18 deletions
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22
arch/arm64/boot/dts/rockchip/rk3576-luckfox-core3576.dtsi
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@ -26,7 +26,6 @@ chosen {
hdmi-con {
compatible = "hdmi-connector";
hdmi-pwr-supply = <&vcc_5v0_hdmi>;
type = "a";
port {
@ -138,22 +137,6 @@ regulator-state-mem {
};
};
vcc_5v0_hdmi: regulator-vcc-5v0-hdmi {
compatible = "regulator-fixed";
enable-active-high;
gpios = <&gpio4 RK_PC6 GPIO_ACTIVE_HIGH>;
pinctrl-names = "default";
pinctrl-0 = <&hdmi_con_en>;
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-name = "vcc_5v0_hdmi";
vin-supply = <&vcc_5v0_sys>;
regulator-state-mem {
regulator-off-in-suspend;
};
};
vcc_5v0_host: regulator-vcc-5v0-host {
compatible = "regulator-fixed";
enable-active-high;
@ -231,6 +214,9 @@ &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";
};
@ -655,7 +641,7 @@ &pcie0 {
&pinctrl {
hdmi {
hdmi_con_en: hdmi-con-en {
hdmi_tx_on_h: hdmi-tx-on-h {
rockchip,pins = <4 RK_PC6 RK_FUNC_GPIO &pcfg_pull_none>;
};
};