linux-kernel - Re: [PATCHv3 0/7] gpio: extend basic_mmio

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Date:	Wed, 4 May 2011 15:37:57 +0100
From:	Jamie Iles <jamie@...ieiles.com>
To:	Anton Vorontsov <cbouatmailru@...il.com>
Cc:	Jamie Iles <jamie@...ieiles.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	tglx@...utronix.de, arnd@...db.de, nico@...xnic.net,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCHv3 0/7] gpio: extend basic_mmio_gpio for different
 controllers

On Wed, May 04, 2011 at 03:31:31PM +0400, Anton Vorontsov wrote:
> On Wed, May 04, 2011 at 12:09:39PM +0100, Jamie Iles wrote:
> > On Wed, May 04, 2011 at 02:34:15AM +0400, Anton Vorontsov wrote:
> > > On Tue, May 03, 2011 at 11:04:08PM +0100, Jamie Iles wrote:
> > > [...]
> > > > The advantage that Grant's proposal has though is that the user can 
> > > > override the gpio_chip callbacks.  When I tried porting over some 
> > > > existing ARM platforms, one of the blocking issues was that lots of 
> > > > platforms had some annoying small detail that was slightly different 
> > > > (such as doing muxing in the _get() callback or needing a to_irq 
> > > > callback).
> > > > 
> > > > If we make bgpio_chip public and return that from bgpio_probe 
> > > > unregistered then the calling code can override some of the methods then 
> > > > register the gpio_chip.
> > > 
> > > Oh, that makes sense, right.
> > 
> > I've just given this a try and it largely works, but it's probably 
> > better if we allow bgpio_chip to be embedded in other structures.  For 
> > example, the langwell driver has a gpio_to_irq callback that we would 
> > need to get the IRQ base for the bank.  We could add a void *priv member 
> > to bgpio_chip but that doesn't feel quite right.
> > 
> > So,
> > 	int bgpio_init(struct bgpio_chip *bgc, struct device *dev, 
> > 		       unsigned long sz, void __iomem *dat, ...)
> > 
> > rather than a probe() that returns the bgpio_chip?
> 
> Sounds good to me.

OK, so here's what I've got so far (patches attached).  I've updated the 
basic_mmio_gpio library with your initial lkml patch and updated it to 
allow bgpio_chip to be embedded in another structure.  I've also 
attempted to convert over the bt8xx and langwell drivers but they're a 
little rough around the edges in places (and untested as I don't have 
the hardware).

Jamie

View attachment "0001-basic_mmio_gpio-split-into-a-gpio-library-and-platfo.patch" of type "text/plain" (14587 bytes)

View attachment "0002-gpio-bt8xxgpio-convert-to-use-basic_mmio_gpio-librar.patch" of type "text/plain" (5728 bytes)

View attachment "0003-gpio-langwell-convert-to-use-basic_mmio_gpio-library.patch" of type "text/plain" (10879 bytes)