accessing USB1_DRVVBUS

Hi,

USBx_DRVVBUS pins are driven by PHY hardware. This happens when the USB tries to establish a connection in Host/OTG mode. for this purpose the pin should be pinmuxed to mode 0, not mode 7, which is GPIO.

Hi Biser,

Thanks for that, but now after making this changei am getting error in boot log

[    9.808142] pinctrl-single 44e10800.pinmux: pin 44e10a34.0 already requested by 47401c00.usb; cannot claim for musb-hdrc.1.auto

[    9.820500] pinctrl-single 44e10800.pinmux: pin-141 (musb-hdrc.1.auto) status -22

[    9.828512] pinctrl-single 44e10800.pinmux: could not request pin 141 (44e10a34.0) from group pinmux_usb1_pins  on device pinctrl-single

[    9.841570] musb-hdrc musb-hdrc.1.auto: Error applying setting, reverse things back

[   10.025353] musb-hdrc musb-hdrc.1.auto: musb_init_controller failed with status -19

[   10.056666] pinctrl-single 44e10800.pinmux: pin 44e10a34.0 already requested by 47401c00.usb; cannot claim for musb-hdrc.1.auto

[   10.068994] pinctrl-single 44e10800.pinmux: pin-141 (musb-hdrc.1.auto) status -22

[   10.077006] pinctrl-single 44e10800.pinmux: could not request pin 141 (44e10a34.0) from group pinmux_usb1_pins  on device pinctrl-single

[   10.090062] musb-dsps musb-hdrc.1.auto: Error applying setting, reverse things back

[   10.166837] pinctrl-single 44e10800.pinmux: pin 44e10a34.0 already requested by 47401c00.usb; cannot claim for musb-hdrc.1.auto

[   10.179167] pinctrl-single 44e10800.pinmux: pin-141 (musb-hdrc.1.auto) status -22

[   10.187221] pinctrl-single 44e10800.pinmux: could not request pin 141 (44e10a34.0) from group pinmux_usb1_pins  on device pinctrl-single

[   10.200356] musb-dsps musb-hdrc.1.auto: Error applying setting, reverse things back

When i checked the pinmux

$cat pinmux-pins

I got this output

pin 141 (44e10a34.0): 47401c00.usb (GPIO UNCLAIMED) function pinmux_usb1_pins group pinmux_usb1_pins

I see in the am33xx.dtsi file there is asection like this

usb1_phy: usb-phy@47401b00 {
                compatible = "ti,am335x-usb-phy";
                reg = <0x47401b00 0x100>;
                reg-names = "phy";
                status = "disabled";
                ti,ctrl_mod = <&ctrl_mod>;
            };

            usb1: usb@47401800 {
                compatible = "ti,musb-am33xx";
                status = "disabled";
                reg = <0x47401c00 0x400
                    0x47401800 0x200>;
                reg-names = "mc", "control";
                interrupts = <19>;
                interrupt-names = "mc";
                dr_mode = "otg";
                mentor,multipoint = <1>;
                mentor,num-eps = <16>;
                mentor,ram-bits = <12>;
                mentor,power = <500>;
                //phys = <&usb1_phy>;

                dmas = <&cppi41dma 15 0 &cppi41dma 16 0
                    &cppi41dma 17 0 &cppi41dma 18 0
                    &cppi41dma 19 0 &cppi41dma 20 0
                    &cppi41dma 21 0 &cppi41dma 22 0
                    &cppi41dma 23 0 &cppi41dma 24 0
                    &cppi41dma 25 0 &cppi41dma 26 0
                    &cppi41dma 27 0 &cppi41dma 28 0
                    &cppi41dma 29 0 &cppi41dma 15 1
                    &cppi41dma 16 1 &cppi41dma 17 1
                    &cppi41dma 18 1 &cppi41dma 19 1
                    &cppi41dma 20 1 &cppi41dma 21 1
                    &cppi41dma 22 1 &cppi41dma 23 1
                    &cppi41dma 24 1 &cppi41dma 25 1
                    &cppi41dma 26 1 &cppi41dma 27 1
                    &cppi41dma 28 1 &cppi41dma 29 1>;
                dma-names =
                    "rx1", "rx2", "rx3", "rx4", "rx5", "rx6", "rx7",
                    "rx8", "rx9", "rx10", "rx11", "rx12", "rx13",
                    "rx14", "rx15",
                    "tx1", "tx2", "tx3", "tx4", "tx5", "tx6", "tx7",
                    "tx8", "tx9", "tx10", "tx11", "tx12", "tx13",
                    "tx14", "tx15";
            };

Will it be wise to disable this part? I see the status disabled anyway but the claim is happening there i think.

Thanks

-RD

This pin is already pinmuxed by the USB init, no need to pinmux it additionaly.

Ok,  but i am trying to reinitialize the USB phy by toggling this pin. I am doing it by exporting the gpio 109(gpio3_13) and toggling the value. But i see no effect.

Thanks

-RD

This will not work. What is your hardware configuration?

I am sorry, i need some specific point to answer that question.

Thanks

-RD

I will send you a friend request with my e-mail.

ok.