linux-kernel - Re: Using uio_pdrv to create an platform device for an FPGA, mmap() fails

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Message-ID: <20120831084238.GD4819@local>
Date:	Fri, 31 Aug 2012 10:42:38 +0200
From:	"Hans J. Koch" <hjk@...sjkoch.de>
To:	"Worth, Kevin" <kevin.worth@...com>
Cc:	"Hans J. Koch" <hjk@...sjkoch.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: Using uio_pdrv to create an platform device for an FPGA, mmap()
 fails

On Thu, Aug 30, 2012 at 11:03:04PM +0000, Worth, Kevin wrote:
> >
> >>  but the code seems like
> >> possibly useful sample/example code.
> >
> >That is another good argument.
> 
> Perhaps this could be genericized to be a generic "Memory Map Userspace
> IO Device" that takes a base address and a length in config (since those
> are really the only things that are particular to my device/usage).

I don't see a point in making it more generic than it already is. Other
people's devices generate interrupts or have several mappings. Since these
drivers are so small, especially when using uio_pdrv, it doesn't make sense
to make it more generic.

> Could be enhanced to allow for additional maps, etc. or just serve as a
> working example. Docs could then also simply refer to this as an example
> of a device that uses the uio_pdrv driver.

Just make your driver clean and simple, then refer to it in the docs as one
possible example.

Thanks,
Hans

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