linux-kernel - Re: passing function pointers through platform devices?

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Date:	Fri, 9 Mar 2007 10:31:19 -0600
From:	NZG <ngustavson@...cinc.com>
To:	David Brownell <david-b@...bell.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: passing function pointers through platform devices?

On Wednesday 07 March 2007 11:55 am, David Brownell wrote:
> > I'm developing an SPI- bus >MMC/SD block driver translation layer.
>
> Another one?  There's already been significant work in that area.  See for
> example
>
>   http://marc.theaimsgroup.com/?l=linux-kernel&m=117000652529003&w=2
Nice, I'll build on that, my previous work ignored the SPI/MMC layers (because 
they didn't exist at the time) and just build a stacked driver on a character 
SPI driver.  This gives me some direction as to how to proceed.

> Which admittedly didn't behave when I just put it onto my test rig,
> but seems nonetheless to be a significant step forward.  It's not like
> everyone has hardware that can use such a driver after all!
True, but it's fairly common right now, until every microcontroller gets a 
hardware SD controller (which seems to be the trend)

> That's how it's done in that patch.  The model being what the PXA MMC/SD
> card driver does, since that's the most generic model I found ... handling
> for example systems which need to poll for card detect, as well as ones
> that can use real gpio based IRQs.  The mmc_spi driver doesn't need to know
> which kind of platform it's got.
Sounds good, thanks

NZG

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