linux-kernel - Re: [PATCH v4 7/7] arm64: dts: ti: k3-j722s: Enable PCIe and USB support on J722S-EVM

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Date: Mon, 3 Jun 2024 09:21:11 -0500
From: Andrew Davis <afd@...com>
To: Siddharth Vadapalli <s-vadapalli@...com>, <nm@...com>, <vigneshr@...com>,
        <kristo@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
        <conor+dt@...nel.org>, <rogerq@...nel.org>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <u-kumar1@...com>,
        <danishanwar@...com>, <srk@...com>
Subject: Re: [PATCH v4 7/7] arm64: dts: ti: k3-j722s: Enable PCIe and USB
 support on J722S-EVM

On 6/1/24 7:15 AM, Siddharth Vadapalli wrote:
> Enable PCIe0 instance of PCIe in Root Complex mode of operation with Lane 0
> of the SERDES1 instance of SERDES. Also enable USB0 instance of USB to
> interface with the Type-C port via the USB hub, by configuring the pin P05
> of the GPIO expander on the EVM. Enable USB1 instance of USB in SuperSpeed
> mode of operation with Lane 0 of the SERDES0 instance of SERDES.
> 
> Co-developed-by: Ravi Gunasekaran <r-gunasekaran@...com>
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> ---
> v3:
> https://lore.kernel.org/r/20240524090514.152727-4-s-vadapalli@ti.com/
> and
> https://lore.kernel.org/r/20240524090514.152727-8-s-vadapalli@ti.com/
> Changes since v3:
> - Above patches have been squashed into this patch.
> 
>   arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 72 +++++++++++++++++++++++++
>   1 file changed, 72 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
> index bf3c246d13d1..3145e680e2d3 100644
> --- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
> +++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
> @@ -9,7 +9,9 @@
>   /dts-v1/;
>   
>   #include <dt-bindings/net/ti-dp83867.h>
> +#include <dt-bindings/phy/phy.h>
>   #include "k3-j722s.dtsi"
> +#include "k3-serdes.h"
>   
>   / {
>   	compatible = "ti,j722s-evm", "ti,j722s";
> @@ -202,6 +204,12 @@ J722S_IOPAD(0x0130, PIN_OUTPUT, 0) /* (AG26) RGMII1_TXC */
>   			J722S_IOPAD(0x012c, PIN_OUTPUT, 0) /* (AF25) RGMII1_TX_CTL */
>   		>;
>   	};
> +
> +	main_usb1_pins_default: main-usb1-default-pins {
> +		pinctrl-single,pins = <
> +			J722S_IOPAD(0x0258, PIN_INPUT, 0) /* (B27) USB1_DRVVBUS */
> +		>;
> +	};
>   };
>   
>   &cpsw3g {
> @@ -301,6 +309,13 @@ exp1: gpio@23 {
>   				  "PCIe0_1L_RC_RSTz", "PCIe0_1L_PRSNT#",
>   				  "ENET1_EXP_SPARE2", "ENET1_EXP_PWRDN",
>   				  "PD_I2ENET1_I2CMUX_SELC_IRQ", "ENET1_EXP_RESETZ";
> +
> +		p05-hog {
> +			/* P05 - USB2.0_MUX_SEL */
> +			gpio-hog;
> +			gpios = <5 GPIO_ACTIVE_HIGH>;
> +			output-high;
> +		};
>   	};
>   };
>   
> @@ -384,3 +399,60 @@ &sdhci1 {
>   	status = "okay";
>   	bootph-all;
>   };
> +
> +&serdes_ln_ctrl {
> +	idle-states = <J722S_SERDES0_LANE0_USB>,
> +		      <J722S_SERDES1_LANE0_PCIE0_LANE0>;
> +};
> +
> +&serdes0 {
> +	status = "okay";
> +	serdes0_usb_link: phy@0 {
> +		reg = <0>;
> +		cdns,num-lanes = <1>;
> +		#phy-cells = <0>;
> +		cdns,phy-type = <PHY_TYPE_USB3>;
> +		resets = <&serdes_wiz0 1>;
> +	};
> +};
> +
> +&serdes1 {
> +	serdes1_pcie_link: phy@0 {
> +		reg = <0>;
> +		cdns,num-lanes = <1>;
> +		#phy-cells = <0>;
> +		cdns,phy-type = <PHY_TYPE_PCIE>;
> +		resets = <&serdes_wiz1 1>;
> +	};
> +};
> +
> +&pcie0_rc {
> +	status = "okay";

As much as I like these at the top, the new format rules seems to
suggest "status" properties should go at the bottom of the node.

Andrew

> +	reset-gpios = <&exp1 18 GPIO_ACTIVE_HIGH>;
> +	phys = <&serdes1_pcie_link>;
> +	phy-names = "pcie-phy";
> +};
> +
> +&usbss0 {
> +	ti,vbus-divider;
> +	status = "okay";
> +};
> +
> +&usb0 {
> +	dr_mode = "otg";
> +	usb-role-switch;
> +};
> +
> +&usbss1 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&main_usb1_pins_default>;
> +	ti,vbus-divider;
> +	status = "okay";
> +};
> +
> +&usb1 {
> +	dr_mode = "host";
> +	maximum-speed = "super-speed";
> +	phys = <&serdes0_usb_link>;
> +	phy-names = "cdns3,usb3-phy";
> +};