linux-kernel - Re: [PATCH] Documentation: dt: mtd: replace "nor-jedec" binding with "jedec,spi-nor"

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Message-ID: <20150518183442.GR11598@ld-irv-0074>
Date:	Mon, 18 May 2015 11:34:42 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Marek Vasut <marex@...x.de>,
	Rafał Miłecki <zajec5@...il.com>,
	linux-spi@...r.kernel.org
Subject: Re: [PATCH] Documentation: dt: mtd: replace "nor-jedec" binding with
 "jedec,spi-nor"

+ linux-spi

On Mon, May 18, 2015 at 11:45:01AM +0100, Mark Rutland wrote:
> On Fri, May 15, 2015 at 08:55:41PM +0100, Brian Norris wrote:
> > It really helps if I test patches...
> > 
> > On Thu, May 14, 2015 at 10:32:53AM -0700, Brian Norris wrote:
[...]
> > > @@ -305,7 +305,7 @@ static const struct spi_device_id m25p_ids[] = {
> > >  	 * Generic support for SPI NOR that can be identified by the JEDEC READ
> > >  	 * ID opcode (0x9F). Use this, if possible.
> > >  	 */
> > > -	{"nor-jedec"},
> > > +	{"jedec,spi-nor"},
> > 
> > So I forgot (again; we hit this before) that the SPI/OF framework strips
> > everything before the first comma before binding devices. See
> > of_modalias_node(). So I'll have to squash in the patch below to get a
> > usable binding.
> 
> Is it not possible to use the of_match_table on spi_driver::driver? If
> not, we really should make it so.

Hmm, it does look like spi.c supports multiple matching mechanisms, so I
guess m25p80.c could match some with of_match_table and some with
modalias/spi_driver.id_table. See:

static int spi_match_device(struct device *dev, struct device_driver *drv)
{
	const struct spi_device *spi = to_spi_device(dev);
	const struct spi_driver *sdrv = to_spi_driver(drv);

	/* Attempt an OF style match */
	if (of_driver_match_device(dev, drv))
		return 1;
	// ^^^^ we aren't yet (but could be) using this

	/* Then try ACPI */
	if (acpi_driver_match_device(dev, drv))
		return 1;

	if (sdrv->id_table)
		return !!spi_match_id(sdrv->id_table, spi);
	// ^^^^ we're currently only using this

	return strcmp(spi->modalias, drv->name) == 0;
}

I'll see about patching this for 4.2. We have a working solution for
4.1 at least.

Brian
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