On Tue, Nov 16, 2010 at 6:54 PM,
<amit.daniel@samsung.com> wrote:
From: Amit Daniel Kachhap <amit.daniel@samsung.com>
This patch adds support for clock information exposed to debug-fs
interface.
Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
---
arch/arm/plat-samsung/clock.c | 92 ++++++++++++++++++++++++++++
arch/arm/plat-samsung/include/plat/clock.h | 3 +
2 files changed, 95 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-samsung/clock.c b/arch/arm/plat-samsung/clock.c
index e8d20b0..0ba209d 100644
--- a/arch/arm/plat-samsung/clock.c
+++ b/arch/arm/plat-samsung/clock.c
@@ -39,6 +39,7 @@
#include <linux/clk.h>
#include <linux/spinlock.h>
#include <linux/io.h>
+#include <linux/debugfs.h>
#include <mach/hardware.h>
#include <asm/irq.h>
@@ -447,3 +448,94 @@ int __init s3c24xx_register_baseclocks(unsigned long xtal)
return 0;
}
+#if 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);
+#ifdef CONFIG_PLAT_SAMSUNG
+ /*Append id field with name also*/
+ if (c->id >= 0)
+ p += sprintf(p, ":%d", c->id);
+#endif
+
+ 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_DEBUG_FS) */
+
diff --git a/arch/arm/plat-samsung/include/plat/clock.h b/arch/arm/plat-samsung/include/plat/clock.h
index 0fbcd0e..f6180ab 100644
--- a/arch/arm/plat-samsung/include/plat/clock.h
+++ b/arch/arm/plat-samsung/include/plat/clock.h
@@ -47,6 +47,9 @@ struct clk {
struct clk_ops *ops;
int (*enable)(struct clk *, int enable);
+#if defined(CONFIG_DEBUG_FS)
+ struct dentry *dent; /* For visible tree hierarchy */
+#endif
};
/* other clocks which may be registered by board support */
--
1.6.0.6
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