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@xxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
.../boot/dts/renesas/r8a779f0-spider-cpu.dtsi | 24 +++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi b/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
index 76a94812875e..365dfd446eef 100644
--- a/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi
@@ -53,6 +53,12 @@ memory@480000000 {
reg = <0x4 0x80000000 0x0 0x80000000>;
};
+ rc21012_pci: clk-rc21012-pci {
+ compatible = "fixed-clock";
+ clock-frequency = <100000000>;
+ #clock-cells = <0>;
+ };
+
rc21012_ufs: clk-rc21012-ufs {
compatible = "fixed-clock";
clock-frequency = <38400000>;
@@ -106,6 +112,12 @@ gpio_exp_20: gpio@20 {
reg = <0x20>;
gpio-controller;
#gpio-cells = <2>;
+
+ rc21012-gpio2-hog {
+ gpio-hog;
+ gpios = <5 GPIO_ACTIVE_LOW>;
+ output-high;
+ };
};
};
@@ -145,6 +157,18 @@ &mmc0 {
status = "okay";
};
+&pcie0_clkref {
+ compatible = "gpio-gate-clock";
+ clocks = <&rc21012_pci>;
+ enable-gpios = <&gpio2 15 GPIO_ACTIVE_LOW>;
+ /delete-property/ clock-frequency;
+};
+
+&pciec0 {
+ reset-gpio = <&gpio_exp_20 0 GPIO_ACTIVE_LOW>;
+ status = "okay";
+};
+
&pfc {
pinctrl-0 = <&scif_clk_pins>;
pinctrl-names = "default";
--
2.25.1
