[PATCH 26/40] arm64: dts: rockchip: Add frl-enable-gpios to rk3588-rock-5-itx
From: Cristian Ciocaltea
Date: Fri Apr 17 2026 - 05:45:35 EST
The board exposes the GPIO4_B1 line to control the voltage bias on the
HDMI1 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 HDMI1 node to the GPIO line using the frl-enable-gpios
property to allow adjusting the bias when transitioning between TMDS and
FRL operating modes.
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
---
arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts
index f7dd01d6fa0a..1f4c1eb7a8c6 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts
@@ -347,7 +347,8 @@ &gpu {
&hdmi1 {
pinctrl-0 = <&hdmim0_tx1_cec &hdmim0_tx1_hpd
- &hdmim1_tx1_scl &hdmim1_tx1_sda>;
+ &hdmim1_tx1_scl &hdmim1_tx1_sda &hdmi1_frl_en>;
+ frl-enable-gpios = <&gpio4 RK_PB1 GPIO_ACTIVE_LOW>;
status = "okay";
};
@@ -696,6 +697,12 @@ &pd_gpu {
};
&pinctrl {
+ hdmi {
+ hdmi1_frl_en: hdmi1-frl-en {
+ rockchip,pins = <4 RK_PB1 RK_FUNC_GPIO &pcfg_pull_none>;
+ };
+ };
+
hym8563 {
rtc_int: rtc-int {
rockchip,pins = <0 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;
--
2.53.0