linux-kernel - [PATCH v4 3/3] arm64: dts: rockchip: Add missing pinctrl for PCIe20x1 node

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Message-ID: <20240726110050.3664-3-linux.amoon@gmail.com>
Date: Fri, 26 Jul 2024 16:30:46 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>
Cc: Anand Moon <linux.amoon@...il.com>,
	Jonas Karlman <jonas@...boo.se>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/3] arm64: dts: rockchip: Add missing pinctrl for PCIe20x1 node

Add missing pinctrl settings for PCIe 2.0 x1 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 'pcie2' to 'pcie20x1' to align with schematic
nomenclature.

Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
v4: rebase on master, used RK_FUNC_GPIO GPIO function instead of PIN
number.
V3: New patch.
---
 arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
index eeae14842b71..813a28b8916e 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
@@ -326,7 +326,7 @@ &pcie2x1l0 {

 &pcie2x1l2 {
 	pinctrl-names = "default";
-	pinctrl-0 = <&pcie2_2_rst>;
+	pinctrl-0 = <&pcie20x12_pins>;
 	reset-gpios = <&gpio3 RK_PB0 GPIO_ACTIVE_HIGH>;
 	vpcie3v3-supply = <&vcc3v3_pcie2x1l2>;
 	status = "okay";
@@ -363,9 +363,15 @@ hp_detect: hp-detect {
 		};
 	};

-	pcie2 {
-		pcie2_2_rst: pcie2-2-rst {
-			rockchip,pins = <3 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;
+	pcie20x1 {
+		pcie20x12_pins: pcie20x12-pins {
+			rockchip,pins =
+				/* PCIE20_1_2_CLKREQn_M1_L */
+				<3 RK_PC7 RK_FUNC_GPIO &pcfg_pull_up>,
+				/* PCIE_PERST_L */
+				<3 RK_PB0 RK_FUNC_GPIO &pcfg_pull_up>,
+				/* PCIE20_1_2_WAKEn_M1_L */
+				<3 RK_PD0 RK_FUNC_GPIO &pcfg_pull_up>;
 		};
 	};

-- 
2.44.0