On 01/22/2013 04:37 PM, kishon wrote:
> On Tuesday 22 January 2013 07:47 PM, Roger Quadros wrote:
>> On 01/22/2013 11:58 AM, Kishon Vijay Abraham I wrote:
>>> The OMAP glue has been modified to get PHY by phandle for dt boot.
>>>
>>> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
>>> ---
>>> drivers/usb/musb/omap2430.c | 7 ++++++-
>>> 1 file changed, 6 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
>>> index 1a8cf6d..e43faeb 100644
>>> --- a/drivers/usb/musb/omap2430.c
>>> +++ b/drivers/usb/musb/omap2430.c
>>> @@ -345,7 +345,12 @@ static int omap2430_musb_init(struct musb *musb)
>>> * up through ULPI. TWL4030-family PMICs include one,
>>> * which needs a driver, drivers aren't always needed.
>>> */
>>> - musb->xceiv = devm_usb_get_phy_dev(dev, 0);
>>> + if (dev->parent->of_node)
>>> + musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent,
>>> + "usb_phy", 0);
>>> + else
>>> + musb->xceiv = devm_usb_get_phy_dev(dev, 0);
>>> +
>>> if (IS_ERR_OR_NULL(musb->xceiv)) {
>>> pr_err("HS USB OTG: no transceiver configured\n");
>>> return -ENODEV;
>>
>> This will not work with PHY driver as a module. You need to use deferred probing mechanism here
>> after you have addressed my comment in patch 2 and also devm_usb_get_phy_by_phandle()
>
> IIUC, even using -EPROBE_DEFER might not help if we are making the PHY driver as module, since the kernel will try to probe only till the prompt comes.
>
Oh really? I thought deferred probing takes place whenever a new driver is bound to a device. What does "prompt comes" have to do with it?
> And having -EPROBE_DEFER instead of -ENODEV might also not help since, the gadget driver wont be able to bind to UDC (usb_gadget_probe_driver will fail).
>
> A lot of things need to be changed before we change to -EPROBE_DEFER IMO.
OK.
--
cheers,
-roger
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