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

[Ladislav Michl <ladis-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org>]

+Rob and the DT ML

On Wed, Jan 10, 2018 at 07:35:19PM +0200, Aaro Koskinen wrote:
> Hi,
> 
> 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@6800a000/onenand@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.

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?

Thank you for your patience,
	ladis
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