Toggle USB_PWR_EN PIN E15 GPIOA_6(TDMB_D3//TDMB_DIN3//PDM_DIN2)

gerhardjl · October 12, 2023, 7:17pm

Which Khadas SBC do you use?

VIM3 / VIM3 PRO

Which system do you use? Android, Ubuntu, OOWOW or others?

UBUNTU

Which version of system do you use? Khadas official images, self built images, or others?

Fenix server std khadas (k4.9 // k5.12)

Please describe your issue below:

I need to reset the device on USB3 -
by switching the USB3 VCC (VBUS) OFF/ON
I see on the khadas (VIM3/PRO) sch the signal which controls VCC5V_HOST
On schematics USB_PWR_EN is connected to Pin E15
GPIOA_6(TDMB_D3//TDMB_DIN3//PDM_DIN2)

I would like to toggle this pin (USB_PWR_EN)

How can I do this?

numbqq · October 13, 2023, 9:10am

Maybe you can change the driver to control the power.

github.com

khadas/linux/blob/khadas-vims-4.9.y/drivers/amlogic/usb/phy/phy-aml-new-usb2-v2.c#L313


      
          	u32 u2_ctrl_sleep_shift = 0;
          	u32 u2_hhi_mem_pd_shift = 0;
          	u32 u2_hhi_mem_pd_mask = 0;
          	u32 u2_ctrl_iso_shift = 0;
          	gpio_name = of_get_property(dev->of_node, "gpio-vbus-power", NULL);
          	if (gpio_name) {
          		usb_gd = gpiod_get_index(&pdev->dev,
          				 NULL, 0, GPIOD_OUT_LOW);
          		if (IS_ERR(usb_gd))
          			return -1;
                  gpiod_direction_output(usb_gd, 1);
          	}
          
          
	prop = of_get_property(dev->of_node, "portnum", NULL);
          	if (prop)
          		portnum = of_read_ulong(prop, 1);
          
          
	if (!portnum) {
          		dev_err(&pdev->dev, "This phy has no usb port\n");
          		return -ENOMEM;
          	}