From 92031575c3e60c2f641aacf752bd7494d65e70f7 Mon Sep 17 00:00:00 2001 From: Peter De Schrijver Date: Tue, 21 Mar 2017 15:20:31 +0200 Subject: [PATCH] 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 Reviewed-by: Jon Mayo [sboyd@codeaurora.org: Remove useless cast from void and extra newline] Signed-off-by: Stephen Boyd Signed-off-by: Michael Turquette --- drivers/clk/clk.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) 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) -- 2.20.1