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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: Peter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
[sboyd@codeaurora.org: Remove useless cast from void and extra
newline]
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
hifive-unleashed-5.1
Peter De Schrijver 2017-03-21 15:20:31 +02:00 committed by Michael Turquette
parent 1905719556
commit 92031575c3
1 changed files with 32 additions and 0 deletions
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32
drivers/clk/clk.c
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@ -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)