linux-kernel - Re: [PATCH 2/2] arm64: dts: ti: am642-phyboard-electra: Add overlay to enable PCIe

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Message-ID: <43f9af45-13ac-475d-ae94-a815b3f84381@phytec.de>
Date: Mon, 6 May 2024 17:02:00 +0200
From: Wadim Egorov <w.egorov@...tec.de>
To: Nathan Morrisson <nmorrisson@...tec.com>, <nm@...com>, <vigneshr@...com>,
	<kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <upstream@...ts.phytec.de>
Subject: Re: [PATCH 2/2] arm64: dts: ti: am642-phyboard-electra: Add overlay
 to enable PCIe

Hi Nathan,

Am 04.05.24 um 00:35 schrieb Nathan Morrisson:
> Add an overlay to enable PCIe on the am642-phyboard-electra. This
> will disable USB3 and restrict us to USB2.
> 
> Signed-off-by: Nathan Morrisson <nmorrisson@...tec.com>
> ---
>   arch/arm64/boot/dts/ti/Makefile               |  3 +
>   .../k3-am642-phyboard-electra-pcie-usb2.dtso  | 88 +++++++++++++++++++
>   2 files changed, 91 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 9a722c2473fb..6a38ce2603af 100644
> --- a/arch/arm64/boot/dts/ti/Makefile
> +++ b/arch/arm64/boot/dts/ti/Makefile
> @@ -48,6 +48,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am642-hummingboard-t.dtb
>   dtb-$(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-$(CONFIG_ARCH_K3) += k3-am642-phyboard-electra-pcie-usb2.dtbo
>   dtb-$(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
> @@ -131,6 +132,8 @@ k3-am62p5-sk-csi2-tevi-ov5640-dtbs := k3-am62p5-sk.dtb \
>   	k3-am62x-sk-csi2-tevi-ov5640.dtbo
>   k3-am642-evm-icssg1-dualemac-dtbs := \
>   	k3-am642-evm.dtb k3-am642-evm-icssg1-dualemac.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..03fc81a6018f
> --- /dev/null
> +++ b/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-pcie-usb2.dtso
> @@ -0,0 +1,88 @@
> +// 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@...tec.com>
> + *
> + * Copyright (C) 2024 PHYTEC America, LLC - https://www.phytec.com
> + * Author: Nathan Morrisson <nmorrisson@...tec.com>
> + */
> +
> +/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>;
^ you have two spaces after =

> +		status = "okay";
you do not need this status property here.

With this changes, for both patches:

Reviewed-by: Wadim Egorov <w.egorov@...tec.de>


> +	};
> +};
> +
> +&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";
> +};