Add an overlay to enable PCIe on the am642-phyboard-electra. The serdes is muxed from USB to PCIe, so we are restricted to USB2 while using this overlay. Signed-off-by: Nathan Morrisson <nmorrisson@xxxxxxxxxx> Reviewed-by: Wadim Egorov <w.egorov@xxxxxxxxx> --- v4: - Add explanation for disabling usb3 to commit message v3: - Fix typo from .dtbs to -dtbs in Makefile for overlay testing v2: - Fix double space typo - Remove redundant status = okay arch/arm64/boot/dts/ti/Makefile | 3 + .../k3-am642-phyboard-electra-pcie-usb2.dtso | 87 +++++++++++++++++++ 2 files changed, 90 insertions(+) create mode 100644 arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-pcie-usb2.dtso diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile index 2c327cc320cf..1906711b9b77 100644 --- a/arch/arm64/boot/dts/ti/Makefile +++ b/arch/arm64/boot/dts/ti/Makefile @@ -49,6 +49,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am642-hummingboard-t-pcie.dtb dtb-$(CONFIG_ARCH_K3) += k3-am642-hummingboard-t-usb3.dtb dtb-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-rdk.dtb dtb-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-gpio-fan.dtbo +dtb-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-pcie-usb2.dtbo dtb-$(CONFIG_ARCH_K3) += k3-am642-sk.dtb dtb-$(CONFIG_ARCH_K3) += k3-am642-tqma64xxl-mbax4xxl.dtb dtb-$(CONFIG_ARCH_K3) += k3-am64-tqma64xxl-mbax4xxl-sdcard.dtbo @@ -134,6 +135,8 @@ k3-am642-evm-icssg1-dualemac-dtbs := \ k3-am642-evm.dtb k3-am642-evm-icssg1-dualemac.dtbo k3-am642-phyboard-electra-gpio-fan-dtbs := \ k3-am642-phyboard-electra-rdk.dtb k3-am642-phyboard-electra-gpio-fan.dtbo +k3-am642-phyboard-electra-pcie-usb2-dtbs := \ + k3-am642-phyboard-electra-rdk.dtb k3-am642-phyboard-electra-pcie-usb2.dtbo k3-am642-tqma64xxl-mbax4xxl-sdcard-dtbs := \ k3-am642-tqma64xxl-mbax4xxl.dtb k3-am64-tqma64xxl-mbax4xxl-sdcard.dtbo k3-am642-tqma64xxl-mbax4xxl-wlan-dtbs := \ diff --git a/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-pcie-usb2.dtso b/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-pcie-usb2.dtso new file mode 100644 index 000000000000..7a5ce4bc02f3 --- /dev/null +++ b/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-pcie-usb2.dtso @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0-only OR MIT +/* + * DT overlay for PCIe support (limits USB to 2.0/high-speed) + * + * Copyright (C) 2021 PHYTEC America, LLC - https://www.phytec.com + * Author: Matt McKee <mmckee@xxxxxxxxxx> + * + * Copyright (C) 2024 PHYTEC America, LLC - https://www.phytec.com + * Author: Nathan Morrisson <nmorrisson@xxxxxxxxxx> + */ + +/dts-v1/; +/plugin/; + +#include <dt-bindings/gpio/gpio.h> +#include <dt-bindings/phy/phy.h> +#include <dt-bindings/phy/phy-cadence.h> + +#include "k3-pinctrl.h" +#include "k3-serdes.h" + +&{/} { + pcie_refclk0: pcie-refclk0 { + compatible = "gpio-gate-clock"; + pinctrl-names = "default"; + pinctrl-0 = <&pcie_usb_sel_pins_default>; + clocks = <&serdes_refclk>; + #clock-cells = <0>; + enable-gpios = <&main_gpio1 7 GPIO_ACTIVE_HIGH>; + }; +}; + +&main_pmx0 { + pcie_usb_sel_pins_default: pcie-usb-sel-default-pins { + pinctrl-single,pins = < + AM64X_IOPAD(0x017c, PIN_OUTPUT, 7) /* (T1) PRG0_PRU0_GPO7.GPIO1_7 */ + >; + }; + + pcie_pins_default: pcie-default-pins { + pinctrl-single,pins = < + AM64X_IOPAD(0x0098, PIN_OUTPUT, 7) /* (W19) GPMC0_WAIT0.GPIO0_37 */ + >; + }; +}; + +&pcie0_rc { + pinctrl-names = "default"; + pinctrl-0 = <&pcie_pins_default>; + reset-gpios = <&main_gpio0 37 GPIO_ACTIVE_HIGH>; + phys = <&serdes0_pcie_usb_link>; + phy-names = "pcie-phy"; + num-lanes = <1>; + status = "okay"; +}; + +&serdes0_pcie_usb_link { + cdns,phy-type = <PHY_TYPE_PCIE>; +}; + +&serdes_ln_ctrl { + idle-states = <AM64_SERDES0_LANE0_PCIE0>; +}; + +&serdes0 { + assigned-clock-parents = <&pcie_refclk0>, <&pcie_refclk0>, <&pcie_refclk0>; +}; + +&serdes_refclk { + clock-frequency = <100000000>; +}; + +/* + * Assign pcie_refclk0 to serdes_wiz0 as ext_ref_clk. + * This makes sure that the clock generator gets enabled at the right time. + */ +&serdes_wiz0 { + clocks = <&k3_clks 162 0>, <&k3_clks 162 1>, <&pcie_refclk0>; +}; + +&usbss0 { + ti,usb2-only; +}; + +&usb0 { + maximum-speed = "high-speed"; +}; -- 2.25.1
