[PATCH v4 1/3] arm64: dts: rockchip: Add missing pinctrl for PCIe30x4 node

[Anand Moon]

Add missing pinctrl settings for PCIe 3.0 x4 clock request and wake
signals. Each component of PCIe communication have the following control
signals: PERST, WAKE, CLKREQ, and REFCLK. These signals work to generate
high-speed signals and communicate with other PCIe devices.
Used by root complex to endpoint depending on the power state.

PERST is referred to as a fundamental reset. PERST should be held low
until all the power rails in the system and the reference clock are stable.
A transition from low to high in this signal usually indicates the
beginning of link initialization.

WAKE signal is an active-low signal that is used to return the PCIe
interface to an active state when in a low-power state.

CLKREQ signal is also an active-low signal and is used to request the
reference clock.

Rename node from 'pcie3' to 'pcie30x4' to align with schematic
nomenclature.

Signed-off-by: Anand Moon <linux.amoon at gmail.com>
---
v4: rebase on master, used RK_FUNC_GPIO GPIO function instead of PIN
number.
V3: use pinctrl local to board
V2: Update the commit messge to describe the changs.
    use pinctl group as its pre define in pinctrl dtsi
---
 .../arm64/boot/dts/rockchip/rk3588-rock-5b.dts | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
index 966bbc582d89..1c7080cca11f 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
@@ -338,7 +338,7 @@ &pcie30phy {
 
 &pcie3x4 {
 	pinctrl-names = "default";
-	pinctrl-0 = <&pcie3_rst>;
+	pinctrl-0 = <&pcie30x4_pins>;
 	reset-gpios = <&gpio4 RK_PB6 GPIO_ACTIVE_HIGH>;
 	vpcie3v3-supply = <&vcc3v3_pcie30>;
 	status = "okay";
@@ -377,14 +377,20 @@ pcie2_2_rst: pcie2-2-rst {
 		};
 	};
 
-	pcie3 {
-		pcie3_rst: pcie3-rst {
-			rockchip,pins = <4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
-		};
-
+	pcie30x4 {
 		pcie3_vcc3v3_en: pcie3-vcc3v3-en {
 			rockchip,pins = <1 RK_PA4 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
+
+		pcie30x4_pins: pcie30x4-pins {
+			rockchip,pins =
+				/* PCIE30X4_CLKREQn_M1_L */
+				<4 RK_PB4 RK_FUNC_GPIO &pcfg_pull_up>,
+				/* PCIE30X4_PERSTn_M1_L */
+				<4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_down>,
+				/* PCIE30X4_WAKEn_M1_L */
+				<4 RK_PB5 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
 	};
 
 	usb {

base-commit: 1722389b0d863056d78287a120a1d6cadb8d4f7b
-- 
2.44.0