From 866e9c118b51cffb74c299e40097890d4eaa2e61 Mon Sep 17 00:00:00 2001
From: Humberto Silva Naves <hsnaves@gmail.com>
Date: Mon, 14 Jul 2014 07:04:03 +0200
Subject: [PATCH] clk: added extra features to DebugFS representation of the
 clock tree.

---
 drivers/clk/Kconfig |  8 ++++++++
 drivers/clk/clk.c   | 16 ++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 675749f811ba..a4125f364bb9 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -33,6 +33,14 @@ config COMMON_CLK_DEBUG
 	  clk_flags, clk_prepare_count, clk_enable_count &
 	  clk_notifier_count.
 
+config COMMON_CLK_DEBUG_EXTRA
+	bool "Extra features for the clock tree DebugFS"
+	depends on COMMON_CLK_DEBUG
+	---help---
+	  Adds one write-one file named change_rate to each
+	  directory, allowing the function clk_set_rate to
+	  be called.
+
 config COMMON_CLK_WM831X
 	tristate "Clock driver for WM831x/2x PMICs"
 	depends on MFD_WM831X
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 77fcd069c64a..3808d87f37b8 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -226,6 +226,16 @@ static const struct file_operations clk_dump_fops = {
 	.release	= single_release,
 };
 
+#if CONFIG_COMMON_CLK_DEBUG_EXTRA
+static int debugfs_clk_set_rate(void *data, u64 val)
+{
+	struct clk *clk = (struct clk *) data;
+	return clk_set_rate(clk, (u32) val);
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_clk_rate_wo, NULL, debugfs_clk_set_rate, "%llu\n");
+#endif /* CONFIG_COMMON_CLK_DEBUG_EXTRA */
+
 /* caller must hold prepare_lock */
 static int clk_debug_create_one(struct clk *clk, struct dentry *pdentry)
 {
@@ -248,6 +258,12 @@ static int clk_debug_create_one(struct clk *clk, struct dentry *pdentry)
 	if (!d)
 		goto err_out;
 
+#if CONFIG_COMMON_CLK_DEBUG_EXTRA
+	d = debugfs_create_file("change_rate", S_IWUGO, clk->dentry, clk, &fops_clk_rate_wo);
+	if (!d)
+		goto err_out;
+#endif
+
 	d = debugfs_create_x32("clk_flags", S_IRUGO, clk->dentry,
 			(u32 *)&clk->flags);
 	if (!d)