AGX Xavier how to modify USB's PD Control binding gpio

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

Hi
now i want to use the GPIO23(GPIO(Z, 2)) as USB3-0(UPHY6) 's PD Control binding GPIO
how can i modify to make the binding gpio of usb3-0 to be GPIO23 and make it worked?
By the way ,i use the AGX Xavier, version =# R32 (release), REVISION: 5.1, GCID: 26202423, BOARD: t186ref, EABI: aarch64, DATE: Fri Feb 19 16:50:29 UTC 2021
Thank you very much.

3

Hi,

Please refer to the adaptation guide.

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/adaptation_and_bringup_xavier.html#wwpID0E0MK0HA

4

Hi WayneWWW
I have read the guide. But i still have a question.
How can i bind the gpio to be vbus? in where dts?
Thank you

5

Hi,

Are you talking about the vbus for usb otg mode state table or you are talking about the vbus-supply ?

6

Hi
vbus-supply

now i use the gpio USB_CH2_PRT_CTL to be the vbus. how can i bind the gpio to be the usb vbus. (the usb link UPHY6)

1- \hardware\nvidia\platform\t19x\galen\kernel-dts\common\tegra194-fixed-regulator-p2822-1000.dtsi

p2822_vdd_5v_sata: regulator@114 {
			compatible = "regulator-fixed";
			reg = <114>;
			regulator-name = "vdd-5v-sata";
			regulator-min-microvolt = <5000000>;
			regulator-max-microvolt = <5000000>;
			gpio = <&tegra_main_gpio TEGRA194_MAIN_GPIO(Z, 1) 0>;
			enable-active-high;
			vin-supply = <&battery_reg>;
		};
		
		p2822_vdd_5v_sata2: regulator@115 {
			compatible = "regulator-fixed";
			reg = <115>;
			regulator-name = "vdd-5v-sata";
			regulator-min-microvolt = <5000000>;
			regulator-max-microvolt = <5000000>;
			gpio = <&tegra_main_gpio TEGRA194_MAIN_GPIO(Z, 2) 0>;
			enable-active-high;
			vin-supply = <&battery_reg>;
		};

2 - i verify the tegra19x-mb1-pinmux-p2888-0000-a04-p2822-0000-b01.cfg

pinmux.0x02430060 = 0x00000459; # soc_gpio22_pq2: nv, pull-up, tristate-enable, input-enable, lpdr-disable
pinmux.0x02430068 = 0x00000414; # soc_gpio23_pq3: rsvd0, pull-down, tristate-enable, input-disable, lpdr-disable

verify like below
pinmux.0x02430060 = 0x00000459; # soc_gpio22_pq2: nv, pull-up, tristate-enable, input-enable, lpdr-disable
pinmux.0x02430068 = 0x00000459; # soc_gpio23_pq3: rsvd0, pull-down, tristate-enable, input-disable, lpdr-disable

3 - cat the gpio status

mount -t debugfs debugfs /test
cat /test/gpio

And the status is below:

 gpio-489 (                    |vdd-5v-sata         ) out hi    
 gpio-490 (                    |vdd-5v-sata         ) out lo

the gpio-490 is still output low

please help
i don’t find the code where make the relationship about the gpio and vbus

Thank you

7

HI,

Did you assign this regulator to the “vbus-supply” property under the usb2-x port?

Something like

usb2-0 {
 				vbus-supply = <__you_need_to_assign_the_regulator_here>;
 			};
8

Hi
it’s my code, i think i am wrong here. how can i verify?

ports {
	usb2-1 {
					mode = "host";
					vbus-supply = <&battery_reg>;	//zp
					status = "okay";
				};

Have any blog or case can be read?

9

Hi,

Since you already modify “p2822_vdd_5v_sata” regulator to match your hardware (with GPIO Z,1), then you can just tell usb2-0 to use p2822_vdd_5v_sata instead of battery_reg as regulator, if your usb2-0 port is using GPIO Z,1.

battery_reg is a dummy regulator we set by default.

10

thanks WayneWWW
now it worked.

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12

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