Re: [PATCH RESEND 0/6 v10] gpio: Add block GPIO

[Wolfgang Grandegger]

On 12/17/2012 07:02 PM, Roland Stigge wrote:
> On 12/17/2012 06:37 PM, Wolfgang Grandegger wrote:
>> 	/* Do synchronous data output with a single write access */
>> 	__raw_writel(~mask, pio + PIO_OWDR);
>> 	__raw_writel(mask, pio + PIO_OWER);
>> 	__raw_writel(val, pio + PIO_ODSR);
>>
>> For caching we would need a storage. Not sure if it's worth compared to
>> a context switch into the kernel.
> 
> Block GPIO is not only for you in userspace. ;-) You can also implement
> efficient n-bit bus I/O in kernel drivers, n-bit-banging. :-) So not
> always context switches involved.

OK, what do you think about the following untested patch: