Messages in this thread | | | Date | Mon, 17 Dec 2012 19:02:45 +0100 | From | Roland Stigge <> | Subject | Re: [PATCH RESEND 0/6 v10] gpio: Add block GPIO |
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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.
Roland
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