Commit a5302572 authored by Jon Hunter's avatar Jon Hunter Committed by Paul Walmsley
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OMAP: Add debugfs node to show the summary of all clocks 



Add a debugfs node called "summary" to /sys/kernel/debug/clock/
that displays a quick summary of all clocks registered in the
"clocks" structure. The format of the output from this node is:

<clock-name> <parent-name> <rate> <usecount>

This debugfs node was very helpful for taking a quick snapshot of
the linux clock tree for OMAP and ensuring clock frequencies
calculated by the kernel were indeed correct. This patch helped
uncover some bugs in the linux clock tree for OMAP4.

Signed-off-by: default avatarJon Hunter <jon-hunter@ti.com>
Signed-off-by: default avatarPaul Walmsley <paul@pwsan.com>
parent c8458413

arch/arm/plat-omap/clock.c

+39 −0
Original line number Diff line number Diff line
@@ -475,8 +475,41 @@ int __init clk_init(struct clk_functions * custom_clocks) 
/*

 *	debugfs support to trace clock tree hierarchy and attributes

 */



#include <linux/debugfs.h>

#include <linux/seq_file.h>



static struct dentry *clk_debugfs_root;



static int clk_dbg_show_summary(struct seq_file *s, void *unused)

{

	struct clk *c;

	struct clk *pa;



	seq_printf(s, "%-30s %-30s %-10s %s\n",

		"clock-name", "parent-name", "rate", "use-count");



	list_for_each_entry(c, &clocks, node) {

		pa = c->parent;

		seq_printf(s, "%-30s %-30s %-10lu %d\n",

			c->name, pa ? pa->name : "none", c->rate, c->usecount);

	}



	return 0;

}



static int clk_dbg_open(struct inode *inode, struct file *file)

{

	return single_open(file, clk_dbg_show_summary, inode->i_private);

}



static const struct file_operations debug_clock_fops = {

	.open           = clk_dbg_open,

	.read           = seq_read,

	.llseek         = seq_lseek,

	.release        = single_release,

};



static int clk_debugfs_register_one(struct clk *c)

{

	int err;
@@ -551,6 +584,12 @@ static int __init clk_debugfs_init(void) 
		if (err)

			goto err_out;

	}



	d = debugfs_create_file("summary", S_IRUGO,

		d, NULL, &debug_clock_fops);

	if (!d)

		return -ENOMEM;



	return 0;

err_out:

	debugfs_remove_recursive(clk_debugfs_root);

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