AW: where to add imx-udc-mx27 in device tree

["Priebe, Sebastian" <Sebastian.Priebe@xxxxxxxxx>]

In imx35.dtsi there is:
usbotg: usb@53ff4000 {
        compatible = "fsl,imx35-usb", "fsl,imx27-usb";
        reg = <0x53ff4000 0x0200>;
        interrupts = <37>;
        clocks = <&clks 73>;
        fsl,usbmisc = <&usbmisc 0>;
        fsl,usbphy = <&usbphy0>;
        status = "disabled";
};

And in our dts we have:
&usbotg {
        compatible = "imx-udc-mx27";
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_usbotg>;
        dr_mode = "peripheral";
        phy_type = "utmi_wide";
        status = "okay";
        /* what to do with workaround = FLS_USB2_WORKAROUND_ENGCM09152 ??? */
};

In our config we have:
CONFIG_IMX_HAVE_PLATFORM_FSL_USB2_UDC=y
CONFIG_USB_GADGET=y
CONFIG_USB_FSL_USB2=y
CONFIG_USB_LIBCOMPOSITE=m
CONFIG_USB_F_ACM=m
CONFIG_USB_U_SERIAL=m
CONFIG_USB_F_SERIAL=m
CONFIG_USB_F_OBEX=m
CONFIG_USB_F_MASS_STORAGE=m
CONFIG_USB_MASS_STORAGE=m
CONFIG_USB_G_SERIAL=m

But modprobe g_serial returns -ENODEV because no UDC can be found in usb_gadget_probe_driver().
So I assumed I have to add an UDC in the device tree. This seems to be wrong.

So, my question is: why is there no UDC found?
We are using fsl_udc_core.c and fsl_mxc_udc.c.

Greetings
Sebastian Priebe





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-----Ursprüngliche Nachricht-----
Von: Fabio Estevam [mailto:festevam@xxxxxxxxx]
Gesendet: Mittwoch, 6. August 2014 14:32
An: Priebe, Sebastian
Cc: devicetree@xxxxxxxxxxxxxxx
Betreff: Re: where to add imx-udc-mx27 in device tree

On Wed, Aug 6, 2014 at 8:52 AM, Priebe, Sebastian <Sebastian.Priebe@xxxxxxxxx> wrote:
> Hello,
>
> I pulled linux-next, but still can't figure out where to add my udc.
> Can you please explain when fsl-udc is loaded?

Maybe I don't understand the question.

There is no 'fsl-udc' that needs to be loaded at all. The USB driver for imx is the chipidea driver.

In the imx27.dtsi we have:

            usbotg: usb@10024000 {
                compatible = "fsl,imx27-usb";
                reg = <0x10024000 0x200>;
                interrupts = <56>;
                clocks = <&clks IMX27_CLK_USB_IPG_GATE>;
                fsl,usbmisc = <&usbmisc 0>;
                status = "disabled";
            };

            usbh1: usb@10024200 {
                compatible = "fsl,imx27-usb";
                reg = <0x10024200 0x200>;
                interrupts = <54>;
                clocks = <&clks IMX27_CLK_USB_IPG_GATE>;
                fsl,usbmisc = <&usbmisc 1>;
                status = "disabled";
            };

            usbh2: usb@10024400 {
                compatible = "fsl,imx27-usb";
                reg = <0x10024400 0x200>;
                interrupts = <55>;
                clocks = <&clks IMX27_CLK_USB_IPG_GATE>;
                fsl,usbmisc = <&usbmisc 2>;
                status = "disabled";
            };

So the "compatible = "fsl,imx27-usb";" is all we need there.

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