[PATCH 12/12] arm64: dts: rockchip: Add rock5b overlays for PCIe endpoint mode

[Niklas Cassel]

Add rock5b overlays for PCIe endpoint mode support.

If using the rock5b as an endpoint against a normal PC, only the
rk3588-rock-5b-pcie-ep.dtbo needs to be applied.

If using two rock5b:s, with one board as EP and the other board as RC,
rk3588-rock-5b-pcie-ep.dtbo and rk3588-rock-5b-pcie-srns.dtbo has to
be applied to the respective boards.

Signed-off-by: Niklas Cassel <cassel at kernel.org>
---
 arch/arm64/boot/dts/rockchip/Makefile              |  5 +++++
 .../boot/dts/rockchip/rk3588-rock-5b-pcie-ep.dtso  | 25 ++++++++++++++++++++++
 .../dts/rockchip/rk3588-rock-5b-pcie-srns.dtso     | 16 ++++++++++++++
 3 files changed, 46 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
index f906a868b71a..d827432d5111 100644
--- a/arch/arm64/boot/dts/rockchip/Makefile
+++ b/arch/arm64/boot/dts/rockchip/Makefile
@@ -117,6 +117,8 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-nanopc-t6.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-orangepi-5-plus.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-quartzpro64.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-rock-5b.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-rock-5b-pcie-ep.dtbo
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-rock-5b-pcie-srns.dtbo
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-tiger-haikou.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-toybrick-x0.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-turing-rk1.dtb
@@ -127,3 +129,6 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-nanopi-r6s.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-nanopi-r6c.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-rock-5a.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-orangepi-5.dtb
+
+# Enable support for device-tree overlays
+DTC_FLAGS_rk3588-rock-5b += -@
diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-pcie-ep.dtso b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-pcie-ep.dtso
new file mode 100644
index 000000000000..672d748fcc67
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-pcie-ep.dtso
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * DT-overlay to run the PCIe3_4L Dual Mode controller in Endpoint mode
+ * in the SRNS (Separate Reference Clock No Spread) configuration.
+ *
+ * NOTE: If using a setup with two ROCK 5B:s, with one board running in
+ * RC mode and the other board running in EP mode, see also the device
+ * tree overlay: rk3588-rock-5b-pcie-srns.dtso.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&pcie30phy {
+	rockchip,rx-common-refclk-mode = <0 0 0 0>;
+};
+
+&pcie3x4 {
+	status = "disabled";
+};
+
+&pcie3x4_ep {
+	vpcie3v3-supply = <&vcc3v3_pcie30>;
+	status = "okay";
+};
diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-pcie-srns.dtso b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-pcie-srns.dtso
new file mode 100644
index 000000000000..1a0f1af65c43
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-pcie-srns.dtso
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * DT-overlay to run the PCIe3_4L Dual Mode controller in Root Complex
+ * mode in the SRNS (Separate Reference Clock No Spread) configuration.
+ *
+ * This device tree overlay is only needed (on the RC side) when running
+ * a setup with two ROCK 5B:s, with one board running in RC mode and the
+ * other board running in EP mode.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&pcie30phy {
+	rockchip,rx-common-refclk-mode = <0 0 0 0>;
+};

-- 
2.44.0