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Commit 92031575 authored by Peter De Schrijver's avatar Peter De Schrijver Committed by Michael Turquette
Browse files

clk: add clk_possible_parents debugfs file 



For validation purposes, it's often useful to be able to retrieve the list
of possible parents in userspace. Add a debugfs file for every clock which
has more than 1 possible parent.

Signed-off-by: default avatarPeter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-by: default avatarJon Mayo <jmayo@nvidia.com>
[sboyd@codeaurora.org: Remove useless cast from void and extra
newline]
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarMichael Turquette <mturquette@baylibre.com>
parent 19057195

drivers/clk/clk.c

+32 −0
Original line number Diff line number Diff line
@@ -2126,6 +2126,31 @@ static const struct file_operations clk_dump_fops = { 
	.release	= single_release,

};



static int possible_parents_dump(struct seq_file *s, void *data)

{

	struct clk_core *core = s->private;

	int i;



	for (i = 0; i < core->num_parents - 1; i++)

		seq_printf(s, "%s ", core->parent_names[i]);



	seq_printf(s, "%s\n", core->parent_names[i]);



	return 0;

}



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

{

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

}



static const struct file_operations possible_parents_fops = {

	.open		= possible_parents_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)

{

	struct dentry *d;
@@ -2177,6 +2202,13 @@ static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry) 
	if (!d)

		goto err_out;



	if (core->num_parents > 1) {

		d = debugfs_create_file("clk_possible_parents", S_IRUGO,

				core->dentry, core, &possible_parents_fops);

		if (!d)

			goto err_out;

	}



	if (core->ops->debug_init) {

		ret = core->ops->debug_init(core->hw, core->dentry);

		if (ret)