[PATCH v2] davinci: DA850 EVM: OHCI platform code
sshtylyov at mvista.com
Wed Dec 21 07:24:49 EST 2011
On 21-12-2011 16:05, I wrote:
>> On Wed, Dec 21, 2011 at 12:50:02, Manjunathappa, Prakash wrote:
>>> From: Ajay Kumar Gupta<ajay.gupta at ti.com>
>>> On this board the OHCI port's power control and over-current signals from
>>> TPS2065 power switch are connected via GPIO2 and GPIO6 respectively,
>>> so we can implement the DA8xx OHCI glue layer's hooks for overriding the
>>> root hub port's power and over-current status bits.
>>> We also have to properly set up the clocking mode in the CFGCHIP2 register,
>>> so that internal 24 MHz reference clock is fed to the USB 2.0 (MUSB) PHY and
>>> its output is used to clock the USB 1.1 (OHCI) PHY...
>>> Signed-off-by: Ajay Kumar Gupta<ajay.gupta at ti.com>
>>> Signed-off-by: Manjunathappa, Prakash<prakash.pm at ti.com>
>> This is the third copy of OHCI platform setup code which is almost
>> the same except for the GPIO numbers.
> Well, in my counting, it's only second, DA830 EVM being the first one.
> What's the third?
Ah, I missed Hawkboard... :-)
> I designed the hub interface to be as abstract as I could, and now you're
> proposing to add GPIO to it? No, I have no clear idea how to keeep it
> abstract and add GPIO support at the same time. I would have been grateful to
> TI if I didn't have to invent this at all and they stop saving on OHCI pins.
Well, I have one idea. We can create a separate module in
arch/arm/mach-davinci/, named say ohci.c, put the shared code there and pass
to it the GPIOs actually used via a function call. Or maybe use existing
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