linux-kernel - Re: [RFC PATCH 02/15] dt: add a match table pointer to struct device

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Message-ID: <20110223184402.GM14597@angua.secretlab.ca>
Date:	Wed, 23 Feb 2011 11:44:03 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Rob Herring <robherring2@...il.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	devicetree-discuss@...ts.ozlabs.org, sfr@...b.auug.org.au,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH 02/15] dt: add a match table pointer to struct
 device

On Wed, Feb 23, 2011 at 12:29:03PM -0600, Rob Herring wrote:
> Grant,
> 
> On 02/22/2011 10:33 PM, Grant Likely wrote:
> >Add a new .of_match field to struct device which points at the
> >matching device driver .of_match_table entry when a device is probed
> >via the device tree
> >
> >Signed-off-by: Grant Likely<grant.likely@...retlab.ca>
> >---
> >  include/linux/device.h    |    1 +
> >  include/linux/of_device.h |    5 +++--
> >  2 files changed, 4 insertions(+), 2 deletions(-)
> >
> >diff --git a/include/linux/device.h b/include/linux/device.h
> >index ca5d252..8d8e267 100644
> >--- a/include/linux/device.h
> >+++ b/include/linux/device.h
> >@@ -441,6 +441,7 @@ struct device {
> >  	struct dev_archdata	archdata;
> >
> >  	struct device_node	*of_node; /* associated device tree node */
> >+	const struct of_device_id *of_match; /* matching of_device_id from driver */
> 
> Couldn't of_match/of_match_table be merged into the platform dev/drv
> id_entry/id_table. Handling MODALIAS for a driver that does both OF
> style and normal platform device matching may be a problem though.

.of_match & .of_match_table works on all devices, not just
platform devices.  It allows the common library of device tree support
routines to be used with any bus type.

g.

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