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

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>

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-luckfox-core3576.dtsi b/arch/arm64/boot/dts/rockchip/rk3576-luckfox-core3576.dtsi
index 749f0a54b478e42020aa4746a41e0ceec1928355..4fc8496828f8029c927f4cb05cba3c5321e785ce 100644 (file)
--- a/arch/arm64/boot/dts/rockchip/rk3576-luckfox-core3576.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3576-luckfox-core3576.dtsi
@@ -26,7 +26,6 @@
 
        hdmi-con {
                compatible = "hdmi-connector";
-               hdmi-pwr-supply = <&vcc_5v0_hdmi>;
                type = "a";
 
                port {
@@ -138,22 +137,6 @@
                };
        };
 
-       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 @@
 };
 
 &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 @@
 
 &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>;
                };
        };