diff options
| author | Peter De Schrijver <pdeschrijver@nvidia.com> | 2017-03-21 16:20:31 +0300 |
|---|---|---|
| committer | Michael Turquette <mturquette@baylibre.com> | 2017-04-12 19:51:38 +0300 |
| commit | 92031575c3e60c2f641aacf752bd7494d65e70f7 (patch) | |
| tree | 727484d5f81a9508109d02c7f01bde06c1baf3df /drivers/clk | |
| parent | 1905719556c077bc5619821e7840cac4f743ac73 (diff) | |
| download | linux-92031575c3e60c2f641aacf752bd7494d65e70f7.tar.xz | |
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>
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/clk.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 67201f67a14a..0d8eb5aa477a 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -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) |