Commit ae1d0a46 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

Merge tag 'soc-device-match-tag1' of... 

Merge tag 'soc-device-match-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers into next/drivers

Pull "soc_device_match() interface for matching against soc_bus attributes"
from Geert Uytterhoeven:

This provides core infrastructure as a dependency for several users
(Freescale/NXP, Samsung, Renesas).

Its core parts have been acked by Greg, and the fixes by Arnd and/or
Greg (the last fix only received an informal ack, that's why I hadn't
added the ack).

This has already been pulled by Ulf, and is present in mmc/next, as a
dependency for a Freescale/NXP driver update.

* tag 'soc-device-match-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers:
  base: soc: Provide a dummy implementation of soc_device_match()
  base: soc: Check for NULL SoC device attributes
  base: soc: Introduce soc_device_match() interface
  base: soc: Early register bus when needed
parents d319fc6d da65a158

drivers/base/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -235,6 +235,7 @@ config GENERIC_CPU_AUTOPROBE 


config SOC_BUS

	bool

	select GLOB



source "drivers/base/regmap/Kconfig"

drivers/base/soc.c

+79 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/spinlock.h>

#include <linux/sys_soc.h>

#include <linux/err.h>

#include <linux/glob.h>



static DEFINE_IDA(soc_ida);
@@ -113,6 +114,12 @@ struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr 
	struct soc_device *soc_dev;

	int ret;



	if (!soc_bus_type.p) {

		ret = bus_register(&soc_bus_type);

		if (ret)

			goto out1;

	}



	soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);

	if (!soc_dev) {

		ret = -ENOMEM;
@@ -156,6 +163,78 @@ void soc_device_unregister(struct soc_device *soc_dev) 


static int __init soc_bus_register(void)

{

	if (soc_bus_type.p)

		return 0;



	return bus_register(&soc_bus_type);

}

core_initcall(soc_bus_register);



static int soc_device_match_one(struct device *dev, void *arg)

{

	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);

	const struct soc_device_attribute *match = arg;



	if (match->machine &&

	    (!soc_dev->attr->machine ||

	     !glob_match(match->machine, soc_dev->attr->machine)))

		return 0;



	if (match->family &&

	    (!soc_dev->attr->family ||

	     !glob_match(match->family, soc_dev->attr->family)))

		return 0;



	if (match->revision &&

	    (!soc_dev->attr->revision ||

	     !glob_match(match->revision, soc_dev->attr->revision)))

		return 0;



	if (match->soc_id &&

	    (!soc_dev->attr->soc_id ||

	     !glob_match(match->soc_id, soc_dev->attr->soc_id)))

		return 0;



	return 1;

}



/*

 * soc_device_match - identify the SoC in the machine

 * @matches: zero-terminated array of possible matches

 *

 * returns the first matching entry of the argument array, or NULL

 * if none of them match.

 *

 * This function is meant as a helper in place of of_match_node()

 * in cases where either no device tree is available or the information

 * in a device node is insufficient to identify a particular variant

 * by its compatible strings or other properties. For new devices,

 * the DT binding should always provide unique compatible strings

 * that allow the use of of_match_node() instead.

 *

 * The calling function can use the .data entry of the

 * soc_device_attribute to pass a structure or function pointer for

 * each entry.

 */

const struct soc_device_attribute *soc_device_match(

	const struct soc_device_attribute *matches)

{

	int ret = 0;



	if (!matches)

		return NULL;



	while (!ret) {

		if (!(matches->machine || matches->family ||

		      matches->revision || matches->soc_id))

			break;

		ret = bus_for_each_dev(&soc_bus_type, NULL, (void *)matches,

				       soc_device_match_one);

		if (!ret)

			matches++;

		else

			return matches;

	}

	return NULL;

}

EXPORT_SYMBOL_GPL(soc_device_match);

include/linux/sys_soc.h

+9 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ struct soc_device_attribute { 
	const char *family;

	const char *revision;

	const char *soc_id;

	const void *data;

};



/**
@@ -34,4 +35,12 @@ void soc_device_unregister(struct soc_device *soc_dev); 
 */

struct device *soc_device_to_device(struct soc_device *soc);



#ifdef CONFIG_SOC_BUS

const struct soc_device_attribute *soc_device_match(

	const struct soc_device_attribute *matches);

#else

static inline const struct soc_device_attribute *soc_device_match(

	const struct soc_device_attribute *matches) { return NULL; }

#endif



#endif /* __SOC_BUS_H */

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