[PATCH AUTOSEL 6.6 34/40] arm64: dts: renesas: r8a779f0: spider: Enable PCIe Host ch0

From: Sasha Levin
Date: Tue Nov 07 2023 - 07:32:36 EST


From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>

[ Upstream commit c588e1c9846b32182fd5a0ceb637b983810e7100 ]

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>
Link: https://lore.kernel.org/r/20230905012404.2915246-3-yoshihiro.shimoda.uh@xxxxxxxxxxx
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
.../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 5cbde8e8fcd5c..477f3114d2fd4 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";
--
2.42.0