1 // SPDX-License-Identifier: GPL-2.0-only OR MIT
2 /*
3 * DT overlay for PCIe support (limits USB to 2.0/high-speed)
4 *
5 * Copyright (C) 2021 PHYTEC America, LLC - https://www.phytec.com
6 * Author: Matt McKee <mmckee@phytec.com>
7 *
8 * Copyright (C) 2024 PHYTEC America, LLC - https://www.phytec.com
9 * Author: Nathan Morrisson <nmorrisson@phytec.com>
10 */
11
12 /dts-v1/;
13 /plugin/;
14
15 #include <dt-bindings/gpio/gpio.h>
16 #include <dt-bindings/phy/phy.h>
17 #include <dt-bindings/phy/phy-cadence.h>
18
19 #include "k3-pinctrl.h"
20 #include "k3-serdes.h"
21
22 &{/} {
23 pcie_refclk0: pcie-refclk0 {
24 compatible = "gpio-gate-clock";
25 pinctrl-names = "default";
26 pinctrl-0 = <&pcie_usb_sel_pins_default>;
27 clocks = <&serdes_refclk>;
28 #clock-cells = <0>;
29 enable-gpios = <&main_gpio1 7 GPIO_ACTIVE_HIGH>;
30 };
31 };
32
33 &main_pmx0 {
34 pcie_usb_sel_pins_default: pcie-usb-sel-default-pins {
35 pinctrl-single,pins = <
36 AM64X_IOPAD(0x017c, PIN_OUTPUT, 7) /* (T1) PRG0_PRU0_GPO7.GPIO1_7 */
37 >;
38 };
39
40 pcie_pins_default: pcie-default-pins {
41 pinctrl-single,pins = <
42 AM64X_IOPAD(0x0098, PIN_OUTPUT, 7) /* (W19) GPMC0_WAIT0.GPIO0_37 */
43 >;
44 };
45 };
46
47 &pcie0_rc {
48 pinctrl-names = "default";
49 pinctrl-0 = <&pcie_pins_default>;
50 reset-gpios = <&main_gpio0 37 GPIO_ACTIVE_HIGH>;
51 phys = <&serdes0_pcie_usb_link>;
52 phy-names = "pcie-phy";
53 num-lanes = <1>;
54 status = "okay";
55 };
56
57 &serdes0_pcie_usb_link {
58 cdns,phy-type = <PHY_TYPE_PCIE>;
59 };
60
61 &serdes_ln_ctrl {
62 idle-states = <AM64_SERDES0_LANE0_PCIE0>;
63 };
64
65 &serdes0 {
66 assigned-clock-parents = <&pcie_refclk0>, <&pcie_refclk0>, <&pcie_refclk0>;
67 };
68
69 &serdes_refclk {
70 clock-frequency = <100000000>;
71 };
72
73 /*
74 * Assign pcie_refclk0 to serdes_wiz0 as ext_ref_clk.
75 * This makes sure that the clock generator gets enabled at the right time.
76 */
77 &serdes_wiz0 {
78 clocks = <&k3_clks 162 0>, <&k3_clks 162 1>, <&pcie_refclk0>;
79 };
80
81 &usbss0 {
82 ti,usb2-only;
83 };
84
85 &usb0 {
86 maximum-speed = "high-speed";
87 };
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