lkml.org 
[lkml]   [2008]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH 2/4] powerpc/qe: new call to revert a gpio to a dedicated function
Date

On Sep 24, 2008, at 6:42 AM, Anton Vorontsov wrote:

> On Tue, Sep 23, 2008 at 11:07:00PM -0500, Kumar Gala wrote:
>>
>> On Sep 23, 2008, at 7:03 PM, Anton Vorontsov wrote:
>>
>>> qe_gpio_set_dedicated() is a platform specific function, which is
>>> used
>>> to revert a pin to a dedicated function. Caller should have already
>>> obtained the gpio via gpio_request().
>>>
>>> This is needed to support Freescale USB Host Controller.
>>>
>>> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
>>> ---
>>> arch/powerpc/include/asm/qe.h | 1 +
>>> arch/powerpc/sysdev/qe_lib/gpio.c | 46 ++++++++++++++++++++++++++
>>> ++
>>> +++++++++
>>> 2 files changed, 47 insertions(+), 0 deletions(-)
>>
>> what do you mean by dedicated function.. be a bit clearer in the
>> commit
>> log.
>
> This term is from the QE spec, I didn't invent anything. ;-)
>
> "Each pin in the I/O ports can be configured as a general-purpose
> I/O signal or as a dedicated peripheral interface signal. ...many
> dedicated peripheral functions are multiplexed onto the ports."

I understand but I think 'dedicated' could be interpreted in another
way (like the GPIO pin is dedicated, not that the pin is used for a
dedicated SoC block).

If it the commit message had said 'to a dedicated on chip peripheral'
it would be clearer.

>> Also, does this depend on gpio_to_chip() patch?
>
> Yeah, the point of exported gpio_to_chip is to let us write
> this function.

I meant can I take this patch w/o the gpio_to_chip() patch? (not clear
from your response)

- k


\
 
 \ /
  Last update: 2008-09-24 16:03    [W:0.072 / U:0.304 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site