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Commit 436c3878 authored by Amit Daniel Kachhap's avatar Amit Daniel Kachhap Committed by Kukjin Kim
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ARM: SAMSUNG: Add support for clock debugging through debug-fs interface 



This patch adds support for clock information exposed to debug-fs interface.

Signed-off-by: default avatarAmit Daniel Kachhap <amit.daniel@samsung.com>
[kgene.kim@samsung.com: removed useless empty lines]
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent 854bf596

arch/arm/plat-samsung/clock.c

+92 −0
Original line number Diff line number Diff line
@@ -39,6 +39,9 @@ 
#include <linux/clk.h>

#include <linux/spinlock.h>

#include <linux/io.h>

#if defined(CONFIG_DEBUG_FS)

#include <linux/debugfs.h>

#endif



#include <mach/hardware.h>

#include <asm/irq.h>
@@ -447,3 +450,92 @@ int __init s3c24xx_register_baseclocks(unsigned long xtal) 
	return 0;

}



#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)

/* debugfs support to trace clock tree hierarchy and attributes */



static struct dentry *clk_debugfs_root;



static int clk_debugfs_register_one(struct clk *c)

{

	int err;

	struct dentry *d, *child, *child_tmp;

	struct clk *pa = c->parent;

	char s[255];

	char *p = s;



	p += sprintf(p, "%s", c->name);



	if (c->id >= 0)

		sprintf(p, ":%d", c->id);



	d = debugfs_create_dir(s, pa ? pa->dent : clk_debugfs_root);

	if (!d)

		return -ENOMEM;



	c->dent = d;



	d = debugfs_create_u8("usecount", S_IRUGO, c->dent, (u8 *)&c->usage);

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}



	d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate);

	if (!d) {

		err = -ENOMEM;

		goto err_out;

	}

	return 0;



err_out:

	d = c->dent;

	list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)

		debugfs_remove(child);

	debugfs_remove(c->dent);

	return err;

}



static int clk_debugfs_register(struct clk *c)

{

	int err;

	struct clk *pa = c->parent;



	if (pa && !pa->dent) {

		err = clk_debugfs_register(pa);

		if (err)

			return err;

	}



	if (!c->dent) {

		err = clk_debugfs_register_one(c);

		if (err)

			return err;

	}

	return 0;

}



static int __init clk_debugfs_init(void)

{

	struct clk *c;

	struct dentry *d;

	int err;



	d = debugfs_create_dir("clock", NULL);

	if (!d)

		return -ENOMEM;

	clk_debugfs_root = d;



	list_for_each_entry(c, &clocks, list) {

		err = clk_debugfs_register(c);

		if (err)

			goto err_out;

	}

	return 0;



err_out:

	debugfs_remove_recursive(clk_debugfs_root);

	return err;

}

late_initcall(clk_debugfs_init);



#endif /* defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) */

arch/arm/plat-samsung/include/plat/clock.h

+3 −0
Original line number Diff line number Diff line
@@ -47,6 +47,9 @@ struct clk { 


	struct clk_ops		*ops;

	int		    (*enable)(struct clk *, int enable);

#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)

	struct dentry		*dent;	/* For visible tree hierarchy */

#endif

};



/* other clocks which may be registered by board support */