[PATCH 2/2] arm64: dts: renesas: r8a779f0: spider: Enable PCIe Host ch0

[Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>]

Enable PCIe Host controller channel 0 on R-Car S4-8 Spider board.

Since this board has an Oculink connector, CLKREQ# pin of PFC for PCIe
should not be used. So, using a GPIO is used to output the clock instead.
Otherwise the controller cannot detect a PCIe device.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 .../boot/dts/renesas/r8a779f0-spider-cpu.dtsi | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi b/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
index dd8e0e159526..12f2a1db4fb7 100644
--- a/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
@@ -66,6 +66,14 @@ &extalr_clk {
 	clock-frequency = <32768>;
 };
 
+&gpio2 {
+	pci-clkreq0-hog {
+		gpio-hog;
+		gpios = <15 GPIO_ACTIVE_LOW>;
+		output-high;
+	};
+};
+
 &hscif0 {
 	pinctrl-0 = <&hscif0_pins>;
 	pinctrl-names = "default";
@@ -86,6 +94,12 @@ gpio_exp_20: gpio@20 {
 		reg = <0x20>;
 		gpio-controller;
 		#gpio-cells = <2>;
+
+		rc21012-gpio2-hog {
+			gpio-hog;
+			gpios = <5 GPIO_ACTIVE_LOW>;
+			output-high;
+		};
 	};
 };
 
@@ -125,6 +139,11 @@ &mmc0 {
 	status = "okay";
 };
 
+&pciec0 {
+	reset-gpio = <&gpio_exp_20 0 GPIO_ACTIVE_LOW>;
+	status = "okay";
+};
+
 &pfc {
 	pinctrl-0 = <&scif_clk_pins>;
 	pinctrl-names = "default";
-- 
2.25.1