On 12/17/2012 10:33 PM, Roland Stigge wrote:

On 17/12/12 20:47, Wolfgang Grandegger wrote:

quoted

On 12/17/2012 07:02 PM, Roland Stigge wrote:

quoted

On 12/17/2012 06:37 PM, Wolfgang Grandegger wrote:

quoted

	/* 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:

Looks good!

Why "untested"? ;-)

Because I didn't have a chance to test it yet. Will do tomorrow.

Wolfgang.