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: Amit Daniel Kachhap <amit.daniel@samsung.com> [kgene.kim@samsung.com: removed useless empty lines] Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
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854bf596b3
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436c387841
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@ -39,6 +39,9 @@
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#include <linux/clk.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#if defined(CONFIG_DEBUG_FS)
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#include <linux/debugfs.h>
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#endif
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#include <mach/hardware.h>
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#include <asm/irq.h>
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@ -447,3 +450,92 @@ int __init s3c24xx_register_baseclocks(unsigned long xtal)
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return 0;
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}
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#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)
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/* debugfs support to trace clock tree hierarchy and attributes */
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static struct dentry *clk_debugfs_root;
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static int clk_debugfs_register_one(struct clk *c)
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{
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int err;
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struct dentry *d, *child, *child_tmp;
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struct clk *pa = c->parent;
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char s[255];
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char *p = s;
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p += sprintf(p, "%s", c->name);
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if (c->id >= 0)
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sprintf(p, ":%d", c->id);
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d = debugfs_create_dir(s, pa ? pa->dent : clk_debugfs_root);
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if (!d)
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return -ENOMEM;
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c->dent = d;
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d = debugfs_create_u8("usecount", S_IRUGO, c->dent, (u8 *)&c->usage);
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if (!d) {
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err = -ENOMEM;
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goto err_out;
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}
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d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate);
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if (!d) {
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err = -ENOMEM;
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goto err_out;
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}
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return 0;
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err_out:
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d = c->dent;
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list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
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debugfs_remove(child);
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debugfs_remove(c->dent);
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return err;
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}
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static int clk_debugfs_register(struct clk *c)
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{
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int err;
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struct clk *pa = c->parent;
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if (pa && !pa->dent) {
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err = clk_debugfs_register(pa);
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if (err)
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return err;
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}
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if (!c->dent) {
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err = clk_debugfs_register_one(c);
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if (err)
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return err;
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}
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return 0;
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}
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static int __init clk_debugfs_init(void)
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{
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struct clk *c;
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struct dentry *d;
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int err;
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d = debugfs_create_dir("clock", NULL);
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if (!d)
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return -ENOMEM;
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clk_debugfs_root = d;
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list_for_each_entry(c, &clocks, list) {
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err = clk_debugfs_register(c);
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if (err)
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goto err_out;
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}
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return 0;
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err_out:
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debugfs_remove_recursive(clk_debugfs_root);
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return err;
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}
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late_initcall(clk_debugfs_init);
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#endif /* defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) */
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@ -47,6 +47,9 @@ struct clk {
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struct clk_ops *ops;
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int (*enable)(struct clk *, int enable);
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#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)
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struct dentry *dent; /* For visible tree hierarchy */
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#endif
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};
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/* other clocks which may be registered by board support */
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