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platform: introduce module id table for platform devices

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Now platform_device is being widely used on SoC processors where the
peripherals are attached to the system bus, which is simple enough.

However, silicon IPs for these SoCs are usually shared heavily across
a family of processors, even products from different companies.  This
makes the original simple driver name based matching insufficient, or
simply not straight-forward.

Introduce a module id table for platform devices, and makes it clear
that a platform driver is able to support some shared IP and handle
slight differences across different platforms (by 'driver_data').
Module alias is handled automatically when a MODULE_DEVICE_TABLE()
is defined.

To not disturb the current platform drivers too much, the matched id
entry is recorded and can be retrieved by platform_get_device_id().

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Eric Miao 2009-02-04 11:52:40 +08:00 • committed by Greg Kroah-Hartman
parent 71b3e0c1ad
commit 57fee4a58f
4 changed files with 49 additions and 1 deletions
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6
include/linux/platform_device.h
View file

@ -12,6 +12,7 @@
#define _PLATFORM_DEVICE_H_
#include <linux/device.h>
#include <linux/mod_devicetable.h>
struct platform_device {
const char * name;
@ -19,8 +20,12 @@ struct platform_device {
struct device dev;
u32 num_resources;
struct resource * resource;
struct platform_device_id *id_entry;
};
#define platform_get_device_id(pdev) ((pdev)->id_entry)
#define to_platform_device(x) container_of((x), struct platform_device, dev)
extern int platform_device_register(struct platform_device *);
@ -56,6 +61,7 @@ struct platform_driver {
int (*resume_early)(struct platform_device *);
int (*resume)(struct platform_device *);
struct device_driver driver;
struct platform_device_id *id_table;
};
extern int platform_driver_register(struct platform_driver *);