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}; 88