linux-kernel - [PATCH 2/3] arm64: dts: ti: Add DT overlay for PCIe + USB2.0 SERDES personality card

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Message-Id: <20240126114530.40913-3-rogerq@kernel.org>
Date: Fri, 26 Jan 2024 13:45:29 +0200
From: Roger Quadros <rogerq@...nel.org>
To: nm@...com,
	vigneshr@...com
Cc: afd@...com,
	a-bhatia1@...com,
	kristo@...nel.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	srk@...com,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Roger Quadros <rogerq@...com>,
	Kishon Vijay Abraham I <kishon@...com>
Subject: [PATCH 2/3] arm64: dts: ti: Add DT overlay for PCIe + USB2.0 SERDES personality card

From: Roger Quadros <rogerq@...com>

Enable both Serdes and PCIe dt nodes in order to get PCIe working in
the SERDES PCIe x2 personality card.

The daughter card also has a USB 2.0 dual-role port. As the base board
already supports a 2.0 dual-role port, enable the port on the SERDES
card to be a host only port.

This will prevent user confusion as having 2 ports in device mode often
leads to confusion as to which port is bound to the gadget function driver.

The PCIe x2 card is provided with the AM65x IDK configuration [1]
so apply the overlay to k3-am654-idk.dtb

[1] https://www.ti.com/lit/ug/spruim6a/spruim6a.pdf

Co-developed-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 arch/arm64/boot/dts/ti/Makefile               |  3 +-
 .../arm64/boot/dts/ti/k3-am654-pcie-usb2.dtso | 65 +++++++++++++++++++
 2 files changed, 67 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/boot/dts/ti/k3-am654-pcie-usb2.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 08ce34d21d5d..3c008623b693 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -47,7 +47,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am64-tqma64xxl-mbax4xxl-wlan.dtbo
 # Boards with AM65x SoC
 k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb k3-am654-base-board-rocktech-rk101-panel.dtbo
 k3-am654-evm-dtbs := k3-am654-base-board.dtb k3-am654-icssg2.dtbo
-k3-am654-idk-dtbs := k3-am654-evm.dtb k3-am654-idk.dtbo
+k3-am654-idk-dtbs := k3-am654-evm.dtb k3-am654-idk.dtbo k3-am654-pcie-usb2.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-am6528-iot2050-basic.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am6528-iot2050-basic-pg2.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am6548-iot2050-advanced.dtb
@@ -58,6 +58,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am654-gp-evm.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am654-evm.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am654-idk.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am654-base-board-rocktech-rk101-panel.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-am654-pcie-usb2.dtbo
 
 # Boards with J7200 SoC
 k3-j7200-evm-dtbs := k3-j7200-common-proc-board.dtb k3-j7200-evm-quad-port-eth-exp.dtbo
diff --git a/arch/arm64/boot/dts/ti/k3-am654-pcie-usb2.dtso b/arch/arm64/boot/dts/ti/k3-am654-pcie-usb2.dtso
new file mode 100644
index 000000000000..477027b033da
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-am654-pcie-usb2.dtso
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * DT overlay for SERDES personality card: 2lane PCIe + USB2.0 Host on AM654 EVM
+ *
+ * Copyright (C) 2018-2024 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/phy/phy.h>
+#include <dt-bindings/phy/phy-am654-serdes.h>
+#include "k3-pinctrl.h"
+
+&serdes0 {
+	assigned-clocks = <&k3_clks 153 4>,
+			  <&serdes0 AM654_SERDES_CMU_REFCLK>,
+			  <&serdes0 AM654_SERDES_RO_REFCLK>;
+	assigned-clock-parents = <&k3_clks 153 8>,
+				 <&k3_clks 153 4>,
+				 <&k3_clks 153 4>;
+	status = "okay";
+};
+
+&serdes1 {
+	assigned-clocks = <&serdes1 AM654_SERDES_CMU_REFCLK>;
+	assigned-clock-parents = <&serdes0 AM654_SERDES_RO_REFCLK>;
+	status = "okay";
+};
+
+&pcie0_rc {
+	num-lanes = <2>;
+	phys = <&serdes0 PHY_TYPE_PCIE 1>, <&serdes1 PHY_TYPE_PCIE 1>;
+	phy-names = "pcie-phy0", "pcie-phy1";
+	reset-gpios = <&pca9555 5 GPIO_ACTIVE_HIGH>;
+	status = "okay";
+};
+
+&pcie0_ep {
+	num-lanes = <2>;
+	phys = <&serdes0 PHY_TYPE_PCIE 1>, <&serdes1 PHY_TYPE_PCIE 1>;
+	phy-names = "pcie-phy0", "pcie-phy1";
+};
+
+&main_pmx0 {
+       usb0_pins_default: usb0-pins-default {
+		pinctrl-single,pins = <
+			AM65X_IOPAD(0x02bc, PIN_OUTPUT, 0) /* (AD9) USB0_DRVVBUS */
+		>;
+	};
+};
+
+&dwc3_0 {
+	status = "okay";
+};
+
+&usb0_phy {
+	status = "okay";
+};
+
+&usb0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb0_pins_default>;
+	dr_mode = "host";
+};
-- 
2.34.1