[PATCH v3 2/5] arm64: dts: rockchip: Split up RK3588's PCIe pinctrls

[FUKAUMI Naoki <naoki@radxa.com>]

From: Sam Edwards <cfsworks@gmail.com>

These pinctrls manage the low-speed PCIe signals:
- CLKREQ#: An output on the RK3588 (both RC or EP modes), used to
  request that external clock-generation circuitry provide a clock.
- PERST#: An input on the RK3588 in EP mode, used to detect a reset
  signal from the RC. In RC mode, the hardware does not use this signal:
  Linux itself generates it by putting the pin in GPIO mode.
- WAKE#: In EP mode, this is an output; in RC mode, this is an input.

Each of these signals serves a distinct purpose, and more importantly,
PERST# should not be muxed when the RK3588 is in the RC role. Bundling
them together in pinctrl groups prevents proper use: indeed, almost none
of the current board-specific .dts files make any use of them.
(Exception: Rock 5A recently had a patch land that misuses _pins; this
 patch corrects that.)

However, on some RK3588 boards, the PCIe 3 controller will indefinitely
stall the boot if CLKREQ# is not muxed (details in the next patch).
This patch unbundles the signals to allow them to be used.

Signed-off-by: Sam Edwards <CFSworks@gmail.com>
Link: https://lore.kernel.org/r/20240912025034.180233-2-CFSworks@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
(cherry picked from commit 4294e32111781b3de4d73b944cbd1bc1662a9a7a)
---
 .../arm64/rockchip/rk3588-base-pinctrl.dtsi   | 271 ++++++++++++++----
 .../src/arm64/rockchip/rk3588s-rock-5a.dts    |   6 +-
 2 files changed, 228 insertions(+), 49 deletions(-)

diff --git a/dts/upstream/src/arm64/rockchip/rk3588-base-pinctrl.dtsi b/dts/upstream/src/arm64/rockchip/rk3588-base-pinctrl.dtsi
index 30db12c4fc82..b12562e9a985 100644
--- a/dts/upstream/src/arm64/rockchip/rk3588-base-pinctrl.dtsi
+++ b/dts/upstream/src/arm64/rockchip/rk3588-base-pinctrl.dtsi
@@ -1612,23 +1612,43 @@
 
 	pcie20x1 {
 		/omit-if-no-ref/
-		pcie20x1m0_pins: pcie20x1m0-pins {
+		pcie20x1m0_clkreqn: pcie20x1m0-clkreqn {
 			rockchip,pins =
 				/* pcie20x1_2_clkreqn_m0 */
-				<3 RK_PC7 4 &pcfg_pull_none>,
+				<3 RK_PC7 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie20x1m0_perstn: pcie20x1m0-perstn {
+			rockchip,pins =
 				/* pcie20x1_2_perstn_m0 */
-				<3 RK_PD1 4 &pcfg_pull_none>,
+				<3 RK_PD1 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie20x1m0_waken: pcie20x1m0-waken {
+			rockchip,pins =
 				/* pcie20x1_2_waken_m0 */
 				<3 RK_PD0 4 &pcfg_pull_none>;
 		};
 
 		/omit-if-no-ref/
-		pcie20x1m1_pins: pcie20x1m1-pins {
+		pcie20x1m1_clkreqn: pcie20x1m1-clkreqn {
 			rockchip,pins =
 				/* pcie20x1_2_clkreqn_m1 */
-				<4 RK_PB7 4 &pcfg_pull_none>,
+				<4 RK_PB7 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie20x1m1_perstn: pcie20x1m1-perstn {
+			rockchip,pins =
 				/* pcie20x1_2_perstn_m1 */
-				<4 RK_PC1 4 &pcfg_pull_none>,
+				<4 RK_PC1 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie20x1m1_waken: pcie20x1m1-waken {
+			rockchip,pins =
 				/* pcie20x1_2_waken_m1 */
 				<4 RK_PC0 4 &pcfg_pull_none>;
 		};
@@ -1654,52 +1674,127 @@
 
 	pcie30x1 {
 		/omit-if-no-ref/
-		pcie30x1m0_pins: pcie30x1m0-pins {
+		pcie30x1m0_0_clkreqn: pcie30x1m0-0-clkreqn {
 			rockchip,pins =
 				/* pcie30x1_0_clkreqn_m0 */
-				<0 RK_PC0 12 &pcfg_pull_none>,
+				<0 RK_PC0 12 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m0_0_perstn: pcie30x1m0-0-perstn {
+			rockchip,pins =
 				/* pcie30x1_0_perstn_m0 */
-				<0 RK_PC5 12 &pcfg_pull_none>,
+				<0 RK_PC5 12 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m0_0_waken: pcie30x1m0-0-waken {
+			rockchip,pins =
 				/* pcie30x1_0_waken_m0 */
-				<0 RK_PC4 12 &pcfg_pull_none>,
+				<0 RK_PC4 12 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m0_1_clkreqn: pcie30x1m0-1-clkreqn {
+			rockchip,pins =
 				/* pcie30x1_1_clkreqn_m0 */
-				<0 RK_PB5 12 &pcfg_pull_none>,
+				<0 RK_PB5 12 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m0_1_perstn: pcie30x1m0-1-perstn {
+			rockchip,pins =
 				/* pcie30x1_1_perstn_m0 */
-				<0 RK_PB7 12 &pcfg_pull_none>,
+				<0 RK_PB7 12 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m0_1_waken: pcie30x1m0-1-waken {
+			rockchip,pins =
 				/* pcie30x1_1_waken_m0 */
 				<0 RK_PB6 12 &pcfg_pull_none>;
 		};
 
 		/omit-if-no-ref/
-		pcie30x1m1_pins: pcie30x1m1-pins {
+		pcie30x1m1_0_clkreqn: pcie30x1m1-0-clkreqn {
 			rockchip,pins =
 				/* pcie30x1_0_clkreqn_m1 */
-				<4 RK_PA3 4 &pcfg_pull_none>,
+				<4 RK_PA3 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m1_0_perstn: pcie30x1m1-0-perstn {
+			rockchip,pins =
 				/* pcie30x1_0_perstn_m1 */
-				<4 RK_PA5 4 &pcfg_pull_none>,
+				<4 RK_PA5 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m1_0_waken: pcie30x1m1-0-waken {
+			rockchip,pins =
 				/* pcie30x1_0_waken_m1 */
-				<4 RK_PA4 4 &pcfg_pull_none>,
+				<4 RK_PA4 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m1_1_clkreqn: pcie30x1m1-1-clkreqn {
+			rockchip,pins =
 				/* pcie30x1_1_clkreqn_m1 */
-				<4 RK_PA0 4 &pcfg_pull_none>,
+				<4 RK_PA0 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m1_1_perstn: pcie30x1m1-1-perstn {
+			rockchip,pins =
 				/* pcie30x1_1_perstn_m1 */
-				<4 RK_PA2 4 &pcfg_pull_none>,
+				<4 RK_PA2 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m1_1_waken: pcie30x1m1-1-waken {
+			rockchip,pins =
 				/* pcie30x1_1_waken_m1 */
 				<4 RK_PA1 4 &pcfg_pull_none>;
 		};
 
 		/omit-if-no-ref/
-		pcie30x1m2_pins: pcie30x1m2-pins {
+		pcie30x1m2_0_clkreqn: pcie30x1m2-0-clkreqn {
 			rockchip,pins =
 				/* pcie30x1_0_clkreqn_m2 */
-				<1 RK_PB5 4 &pcfg_pull_none>,
+				<1 RK_PB5 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m2_0_perstn: pcie30x1m2-0-perstn {
+			rockchip,pins =
 				/* pcie30x1_0_perstn_m2 */
-				<1 RK_PB4 4 &pcfg_pull_none>,
+				<1 RK_PB4 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m2_0_waken: pcie30x1m2-0-waken {
+			rockchip,pins =
 				/* pcie30x1_0_waken_m2 */
-				<1 RK_PB3 4 &pcfg_pull_none>,
+				<1 RK_PB3 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m2_1_clkreqn: pcie30x1m2-1-clkreqn {
+			rockchip,pins =
 				/* pcie30x1_1_clkreqn_m2 */
-				<1 RK_PA0 4 &pcfg_pull_none>,
+				<1 RK_PA0 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m2_1_perstn: pcie30x1m2-1-perstn {
+			rockchip,pins =
 				/* pcie30x1_1_perstn_m2 */
-				<1 RK_PA7 4 &pcfg_pull_none>,
+				<1 RK_PA7 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x1m2_1_waken: pcie30x1m2-1-waken {
+			rockchip,pins =
 				/* pcie30x1_1_waken_m2 */
 				<1 RK_PA1 4 &pcfg_pull_none>;
 		};
@@ -1721,45 +1816,85 @@
 
 	pcie30x2 {
 		/omit-if-no-ref/
-		pcie30x2m0_pins: pcie30x2m0-pins {
+		pcie30x2m0_clkreqn: pcie30x2m0-clkreqn {
 			rockchip,pins =
 				/* pcie30x2_clkreqn_m0 */
-				<0 RK_PD1 12 &pcfg_pull_none>,
+				<0 RK_PD1 12 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x2m0_perstn: pcie30x2m0-perstn {
+			rockchip,pins =
 				/* pcie30x2_perstn_m0 */
-				<0 RK_PD4 12 &pcfg_pull_none>,
+				<0 RK_PD4 12 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x2m0_waken: pcie30x2m0-waken {
+			rockchip,pins =
 				/* pcie30x2_waken_m0 */
 				<0 RK_PD2 12 &pcfg_pull_none>;
 		};
 
 		/omit-if-no-ref/
-		pcie30x2m1_pins: pcie30x2m1-pins {
+		pcie30x2m1_clkreqn: pcie30x2m1-clkreqn {
 			rockchip,pins =
 				/* pcie30x2_clkreqn_m1 */
-				<4 RK_PA6 4 &pcfg_pull_none>,
+				<4 RK_PA6 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x2m1_perstn: pcie30x2m1-perstn {
+			rockchip,pins =
 				/* pcie30x2_perstn_m1 */
-				<4 RK_PB0 4 &pcfg_pull_none>,
+				<4 RK_PB0 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x2m1_waken: pcie30x2m1-waken {
+			rockchip,pins =
 				/* pcie30x2_waken_m1 */
 				<4 RK_PA7 4 &pcfg_pull_none>;
 		};
 
 		/omit-if-no-ref/
-		pcie30x2m2_pins: pcie30x2m2-pins {
+		pcie30x2m2_clkreqn: pcie30x2m2-clkreqn {
 			rockchip,pins =
 				/* pcie30x2_clkreqn_m2 */
-				<3 RK_PD2 4 &pcfg_pull_none>,
+				<3 RK_PD2 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x2m2_perstn: pcie30x2m2-perstn {
+			rockchip,pins =
 				/* pcie30x2_perstn_m2 */
-				<3 RK_PD4 4 &pcfg_pull_none>,
+				<3 RK_PD4 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x2m2_waken: pcie30x2m2-waken {
+			rockchip,pins =
 				/* pcie30x2_waken_m2 */
 				<3 RK_PD3 4 &pcfg_pull_none>;
 		};
 
 		/omit-if-no-ref/
-		pcie30x2m3_pins: pcie30x2m3-pins {
+		pcie30x2m3_clkreqn: pcie30x2m3-clkreqn {
 			rockchip,pins =
 				/* pcie30x2_clkreqn_m3 */
-				<1 RK_PD7 4 &pcfg_pull_none>,
+				<1 RK_PD7 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x2m3_perstn: pcie30x2m3-perstn {
+			rockchip,pins =
 				/* pcie30x2_perstn_m3 */
-				<1 RK_PB7 4 &pcfg_pull_none>,
+				<1 RK_PB7 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x2m3_waken: pcie30x2m3-waken {
+			rockchip,pins =
 				/* pcie30x2_waken_m3 */
 				<1 RK_PB6 4 &pcfg_pull_none>;
 		};
@@ -1774,45 +1909,85 @@
 
 	pcie30x4 {
 		/omit-if-no-ref/
-		pcie30x4m0_pins: pcie30x4m0-pins {
+		pcie30x4m0_clkreqn: pcie30x4m0-clkreqn {
 			rockchip,pins =
 				/* pcie30x4_clkreqn_m0 */
-				<0 RK_PC6 12 &pcfg_pull_none>,
+				<0 RK_PC6 12 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x4m0_perstn: pcie30x4m0-perstn {
+			rockchip,pins =
 				/* pcie30x4_perstn_m0 */
-				<0 RK_PD0 12 &pcfg_pull_none>,
+				<0 RK_PD0 12 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x4m0_waken: pcie30x4m0-waken {
+			rockchip,pins =
 				/* pcie30x4_waken_m0 */
 				<0 RK_PC7 12 &pcfg_pull_none>;
 		};
 
 		/omit-if-no-ref/
-		pcie30x4m1_pins: pcie30x4m1-pins {
+		pcie30x4m1_clkreqn: pcie30x4m1-clkreqn {
 			rockchip,pins =
 				/* pcie30x4_clkreqn_m1 */
-				<4 RK_PB4 4 &pcfg_pull_none>,
+				<4 RK_PB4 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x4m1_perstn: pcie30x4m1-perstn {
+			rockchip,pins =
 				/* pcie30x4_perstn_m1 */
-				<4 RK_PB6 4 &pcfg_pull_none>,
+				<4 RK_PB6 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x4m1_waken: pcie30x4m1-waken {
+			rockchip,pins =
 				/* pcie30x4_waken_m1 */
 				<4 RK_PB5 4 &pcfg_pull_none>;
 		};
 
 		/omit-if-no-ref/
-		pcie30x4m2_pins: pcie30x4m2-pins {
+		pcie30x4m2_clkreqn: pcie30x4m2-clkreqn {
 			rockchip,pins =
 				/* pcie30x4_clkreqn_m2 */
-				<3 RK_PC4 4 &pcfg_pull_none>,
+				<3 RK_PC4 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x4m2_perstn: pcie30x4m2-perstn {
+			rockchip,pins =
 				/* pcie30x4_perstn_m2 */
-				<3 RK_PC6 4 &pcfg_pull_none>,
+				<3 RK_PC6 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x4m2_waken: pcie30x4m2-waken {
+			rockchip,pins =
 				/* pcie30x4_waken_m2 */
 				<3 RK_PC5 4 &pcfg_pull_none>;
 		};
 
 		/omit-if-no-ref/
-		pcie30x4m3_pins: pcie30x4m3-pins {
+		pcie30x4m3_clkreqn: pcie30x4m3-clkreqn {
 			rockchip,pins =
 				/* pcie30x4_clkreqn_m3 */
-				<1 RK_PB0 4 &pcfg_pull_none>,
+				<1 RK_PB0 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x4m3_perstn: pcie30x4m3-perstn {
+			rockchip,pins =
 				/* pcie30x4_perstn_m3 */
-				<1 RK_PB2 4 &pcfg_pull_none>,
+				<1 RK_PB2 4 &pcfg_pull_none>;
+		};
+
+		/omit-if-no-ref/
+		pcie30x4m3_waken: pcie30x4m3-waken {
+			rockchip,pins =
 				/* pcie30x4_waken_m3 */
 				<1 RK_PB1 4 &pcfg_pull_none>;
 		};
diff --git a/dts/upstream/src/arm64/rockchip/rk3588s-rock-5a.dts b/dts/upstream/src/arm64/rockchip/rk3588s-rock-5a.dts
index a385e0991990..d6a0b559edca 100644
--- a/dts/upstream/src/arm64/rockchip/rk3588s-rock-5a.dts
+++ b/dts/upstream/src/arm64/rockchip/rk3588s-rock-5a.dts
@@ -310,7 +310,7 @@
 };
 
 &pcie2x1l2 {
-	pinctrl-0 = <&pcie20x1m0_pins>;
+	pinctrl-0 = <&pcie2_reset>, <&pcie20x1m0_clkreqn>, <&pcie20x1m0_waken>;
 	pinctrl-names = "default";
 	reset-gpios = <&gpio3 RK_PD1 GPIO_ACTIVE_HIGH>;
 	vpcie3v3-supply = <&vcc3v3_wf>;
@@ -328,6 +328,10 @@
 		pow_en: pow-en {
 			rockchip,pins = <0 RK_PC5 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
+
+		pcie2_reset: pcie2-reset {
+			rockchip,pins = <3 RK_PD1 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
 	};
 
 	power {
-- 
2.43.0