linux-kernel - [PATCH v4 2/3] arm64: dts: rockchip: Add missing pinctrl for PCIe30x1 node

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Message-ID: <20240726110050.3664-2-linux.amoon@gmail.com>
Date: Fri, 26 Jul 2024 16:30:45 +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 2/3] arm64: dts: rockchip: Add missing pinctrl for PCIe30x1 node

Add missing pinctrl settings for PCIe 3.0 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 'pcie30x1' 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.
---
 .../arm64/boot/dts/rockchip/rk3588-rock-5b.dts | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
index 1c7080cca11f..eeae14842b71 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
@@ -318,7 +318,7 @@ map2 {
 
 &pcie2x1l0 {
 	pinctrl-names = "default";
-	pinctrl-0 = <&pcie2_0_rst>;
+	pinctrl-0 = <&pcie30x1_pins>;
 	reset-gpios = <&gpio4 RK_PA5 GPIO_ACTIVE_HIGH>;
 	vpcie3v3-supply = <&vcc3v3_pcie2x1l0>;
 	status = "okay";
@@ -364,16 +364,24 @@ hp_detect: hp-detect {
 	};
 
 	pcie2 {
-		pcie2_0_rst: pcie2-0-rst {
-			rockchip,pins = <4 RK_PA5 RK_FUNC_GPIO &pcfg_pull_none>;
+		pcie2_2_rst: pcie2-2-rst {
+			rockchip,pins = <3 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
+	};
 
+	pcie30x1 {
 		pcie2_0_vcc3v3_en: pcie2-0-vcc-en {
 			rockchip,pins = <1 RK_PD2 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
 
-		pcie2_2_rst: pcie2-2-rst {
-			rockchip,pins = <3 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;
+		pcie30x1_pins: pcie30x1-pins {
+			rockchip,pins =
+				/* PCIE30x1_0_CLKREQn_M1_L */
+				<4 RK_PA3 RK_FUNC_GPIO &pcfg_pull_down>,
+				/* PCIE30x1_0_PERSTn_M1_L */
+				<4 RK_PA5 RK_FUNC_GPIO &pcfg_pull_down>,
+				/* PCIE30x1_0_WAKEn_M1_L */
+				<4 RK_PA4 RK_FUNC_GPIO &pcfg_pull_down>;
 		};
 	};
 
-- 
2.44.0