Hi,
On Wed, Oct 19, 2011 at 02:36:10PM +0530, Gupta, Ajay Kumar wrote:
> Hi,
> > On Thu, Oct 13, 2011 at 12:50:55PM +0530, Gupta, Ajay Kumar wrote:
> > > We are facing an issue in AM335x based custom board which has two musb
> > > port.
> > >
> > > a) musb0 ID pin is floating and have micro-B plug receptacle
> > > connector. [DEVICE ONLY]
> > > b) musb1 ID pin is grounded and have standard-A plug receptacle
> > > connector. [HOST ONLY]
> > >
> > > We are using udc-core in linux v3.1-rc8 kernel. This kernel only
> > > provides option for selecting gadget driver for first instance only as
> > > builtin.
> >
> > why don't you mark all gadget drivers as modules ? I do that all the
> > time:
>
> This wouldn't help if we want to use musb1 (host only) port during bootup
> so that root file system on a pen drive connected to it can be mounted.
>
> >
> > CONFIG_USB_GADGET=m
> > CONFIG_USB_GADGET_DEBUG=y
> > CONFIG_USB_GADGET_DEBUG_FILES=y
> > CONFIG_USB_GADGET_DEBUG_FS=y
> > CONFIG_USB_GADGET_VBUS_DRAW=2
> > CONFIG_USB_R8A66597=m
> > CONFIG_USB_M66592=m
> > CONFIG_USB_AMD5536UDC=m
> > CONFIG_USB_CI13XXX_PCI=m
> > CONFIG_USB_NET2272=m
> > CONFIG_USB_NET2272_DMA=y
> > CONFIG_USB_NET2280=m
> > CONFIG_USB_GOKU=m
> > CONFIG_USB_EG20T=m
> > CONFIG_USB_DUMMY_HCD=m
> > CONFIG_USB_GADGET_DUALSPEED=y
> > CONFIG_USB_GADGET_SUPERSPEED=y
> > CONFIG_USB_ZERO=m
> > CONFIG_USB_ZERO_HNPTEST=y
> > CONFIG_USB_AUDIO=m
> > CONFIG_USB_ETH=m
> > CONFIG_USB_ETH_RNDIS=y
> > CONFIG_USB_ETH_EEM=y
> > CONFIG_USB_G_NCM=m
> > CONFIG_USB_GADGETFS=m
> > CONFIG_USB_FUNCTIONFS=m
> > CONFIG_USB_FUNCTIONFS_ETH=y
> > CONFIG_USB_FUNCTIONFS_RNDIS=y
> > CONFIG_USB_FUNCTIONFS_GENERIC=y
> > CONFIG_USB_FILE_STORAGE=m
> > CONFIG_USB_FILE_STORAGE_TEST=y
> > CONFIG_USB_MASS_STORAGE=m
> > CONFIG_USB_G_SERIAL=m
> > CONFIG_USB_MIDI_GADGET=m
> > CONFIG_USB_G_PRINTER=m
> > CONFIG_USB_CDC_COMPOSITE=m
> > CONFIG_USB_G_NOKIA=m
> > CONFIG_USB_G_MULTI=m
> > CONFIG_USB_G_MULTI_RNDIS=y
> > CONFIG_USB_G_MULTI_CDC=y
> > CONFIG_USB_G_HID=m
> > CONFIG_USB_G_DBGP=m
> > # CONFIG_USB_G_DBGP_PRINTK is not set
> > CONFIG_USB_G_DBGP_SERIAL=y
> > CONFIG_USB_G_WEBCAM=m
> >
> > > Current musb driver requires a gadget module to be inserted for a musb
> > > port to be usable in OTG mode which is the only mode available in
> > > v3.1-rc8 due to recent changes removing all HOST and GADGET only
> > > ifdeffery.
> >
> > You can add runtime checks based on platform_data. Something like:
> >
> > switch (pdata->mode) {
> > case MUSB_HOST:
> > start_host();
> > break;
> > case MUSB_PERIPHERAL:
> > start_gadget();
> > break;
> > case MUSB_OTG:
> > start_gadget()
> > start_host();
> > break;
> > default:
> > error();
> > }
> >
> > which means that for a port which is host-only, it won't require a
> > gadget driver and for a port which is gadget-only, it won't start host
> > stack.
>
> If so then how about the menuconfig option for gadget driver for such host
> only port? Shouldn't the gadget driver option be unavailable for such ports?
how we can we change menuconfig for something which isn't compile-time
constant ?
> > > 3) Change musb driver so that there is no need for gadget driver for
> > > host only ports. (may be based on musb->board_mode ?)
> >
> > yes.
>
> Doesn't seem to be a cleaner way as explained above the issue of gadget
> Driver coming in menuconfig for such ports.
you don't assign a port for a gadget driver. Ever. You just load it and,
as of now, it will bind to first available port.
--
balbi
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