[PATCH v5 00/16] OMAP2+ OneNAND driver update

[Ladislav Michl]

On Thu, Jan 11, 2018 at 09:29:31PM +0200, Aaro Koskinen wrote:
> Hi,
> 
> On Wed, Jan 10, 2018 at 10:13:25PM +0100, Ladislav Michl wrote:
> > On Wed, Jan 10, 2018 at 07:35:19PM +0200, Aaro Koskinen wrote:
> > > On Wed, Jan 10, 2018 at 10:20:58AM +0100, Ladislav Michl wrote:
> > > > On Tue, Jan 09, 2018 at 11:01:14PM +0200, Aaro Koskinen wrote:
> > > > > On Tue, Jan 09, 2018 at 02:08:12PM +0100, Ladislav Michl wrote:
> > > > > > Merge window is really close now and patches seems still to be untested on
> > > > > > n8x0. So unless someone is going to test it soon, I'll pick used N800 on
> > > > > > ebay :-/
> > > > > 
> > > > > Today I tried to test them on Nokia N810, and I get:
> > > > > 
> > > > > [    0.174804] omap-gpmc 6800a000.gpmc: GPMC revision 2.0
> > > > > [    0.174865] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
> > > > > [    0.177459] omap-gpmc 6800a000.gpmc: /ocp/gpmc at 6800a000/onenand at 0,0 has no 'bank-width' property
> > > > > [    0.177612] omap-gpmc 6800a000.gpmc: failed to probe DT child 'onenand': -22
> > > > > 
> > > > > With plain v4.15-rc7+ it probes fine.
> > > > 
> > > > Thank you for testing. As stated in cover letter, you need also
> > > > https://patchwork.kernel.org/patch/10043259/
> > > > which can be also found in Roger's branch
> > > > https://github.com/rogerq/linux/commits/for-v4.16/gpmc-omap-immutable
> > > > (see previous replies in this thread and also discussion about OneNAND
> > > > DT node)
> > > 
> > > I applied it, and now get:
> > > 
> > > [    0.174987] omap-gpmc 6800a000.gpmc: GPMC revision 2.0
> > > [    0.175048] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
> > > [    0.177703] omap-gpmc 6800a000.gpmc: Incompatible OneNAND node: missing compatible
> > > [    0.177764] omap-gpmc 6800a000.gpmc: failed to probe DT child 'onenand': -22
> > 
> > As expected without reading discussion about OneNAND DT node :)
> > 
> > In short, this version expects "ti,omap2-onenand" compatible.
> 
> Right. I didn't realize by bootloader was passing the DTB from an old
> kernel.
> 
> So after fixing my boot I got the patches working N800 and N810: I was
> able to read and write on old JFFS2 file systems without any issues. So
> you can add for the series:
> 
> Tested-by: Aaro Koskinen <aaro.koskinen at iki.fi>

Thank you!

> > In earlier version of this patchset there was fixup present, so driver
> > worked even without compatible. Later on (17 Oct 2017 11:46:51 +0300)
> > Roger objected (https://www.spinics.net/lists/linux-omap/msg139576.html):
> > "I don't want to fixup broken DTs like this as they will go silently without
> > being fixed. Let's instead just error out after the dev_warn(). This will
> > force us to fix all DT nodes."
> > So fixup was removed. I know N900 support is under heavy development
> > in mainline, but if n8x0 is considered finished and stable, we should
> > reintroduce fixup. Thoughts?
> 
> N8x0 support is also "under development", and we are fine with updating
> and always using latest in-tree DTs.

That makes things simpler :) I'll post v6 based on -next with patches 13 and
14 squashed.

Thanks to everyone involved for cooperation,
	ladis