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

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Message-ID: <50D01256.1020105@grandegger.com>
Date:	Tue, 18 Dec 2012 07:51:02 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Roland Stigge <stigge@...com.de>
CC:	rmallon@...il.com, gregkh@...uxfoundation.org,
	linus.walleij@...aro.org, broonie@...nsource.wolfsonmicro.com,
	w.sang@...gutronix.de, linux-kernel@...r.kernel.org,
	grant.likely@...retlab.ca, daniel-gl@....net, sr@...x.de,
	plagnioj@...osoft.com, linux-arm-kernel@...ts.infradead.org,
	highguy@...il.com
Subject: Re: [PATCH RESEND 0/6 v10] gpio: Add block GPIO

On 12/17/2012 10:33 PM, Roland Stigge wrote:
> On 17/12/12 20:47, Wolfgang Grandegger wrote:
>> 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:
> 
> Looks good!
> 
> Why "untested"? ;-)

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

Wolfgang.

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