linux-kernel - Re: [PATCH v3 0/6] uio_pruss cleanup and platform support

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Date:	Thu, 4 Oct 2012 09:10:27 -0400
From:	Matt Porter <mporter@...com>
To:	Sekhar Nori <nsekhar@...com>
Cc:	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Philipp Zabel <pza@...gutronix.de>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 0/6] uio_pruss cleanup and platform support

On Thu, Oct 04, 2012 at 06:24:56PM +0530, Sekhar Nori wrote:
> On 10/4/2012 6:12 PM, Matt Porter wrote:
> > On Thu, Oct 04, 2012 at 11:11:45AM +0200, Philipp Zabel wrote:
> >> Hi Matt,
> >>
> >> On 10/3/12, Matt Porter <mporter@...com> wrote:
> >>> This series enables uio_pruss on DA850 and removes use of the
> >>> private SRAM API by the driver. The driver previously was not
> >>> enabled by any platform and the private SRAM API was accessing
> >>> an invalid SRAM bank.
> >>
> >> have you seen my SRAM patch series at https://lkml.org/lkml/2012/9/7/281
> >> "Add device tree support for on-chip SRAM" ?
> > 
> > Yes.
> > 
> >> I think the generic SRAM/genalloc driver (https://lkml.org/lkml/2012/9/7/282)
> >> could be useful to map the L3RAM on Davinci.
> >> With the gen_pool lookup patch (https://lkml.org/lkml/2012/9/7/284) the
> >> uio_pruss driver could then use the gen_pool_find_by_phys() (or
> >> of_get_named_gen_pool() for initialization from device tree) to
> >> retrieve the struct gen_pool*.
> >>
> >> This way you could avoid handing it over via platform data and you could
> >> get rid of arch/arm/mach-davinci/{sram.c,include/mach/sram.h} completely.
> > 
> > I did miss the gen_pool_find_by_phys() call in that series. That does
> > look useful. I actually mentioned your series in an earlier posting
> > since I like it, but since the initialization of the driver was inherently
> > tied to DT it's not usable for DaVinci that's just starting to convert
> > to DT and needs !DT support as well.
> > 
> > I do see it moving to your driver exclusively, but I wanted to make this
> > series focused on only getting rid of the private SRAM API using the
> > existing pdata framework that's already there. I think once
> > gen_pool_find_by_phys() goes upstream we can switch to that and get the
> > address from a resource in the !DT case. I guess we should see if Sekhar
> > would like to see this happen in two steps or just have us depend on
> > the gen_pool_find_by_phys() patch now.
> 
> I prefer going with this series now and switching to the SRAM driver
> once it is available mainline.

Ok, thanks. In that case, I'll also plan to keep the davinci-pcm series
using the same approach for now too.

-Matt
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