openwrt/target/linux/layerscape/patches-4.4/8236-clk-add-API-of-clks.patch

From df2373ca941741f3f66750241a048ad4e2ff2c91 Mon Sep 17 00:00:00 2001
From: Zhao Qiang <qiang.zhao@nxp.com>
Date: Thu, 24 Nov 2016 11:47:45 +0800
Subject: [PATCH 236/238] clk: add API of clks

Signed-off-by: Zhao Qiang <qiang.zhao@nxp.com>
---
 drivers/clk/clk.c            |   19 +++++++++++++++++++
 include/linux/clk-provider.h |    1 +
 include/linux/clk.h          |    9 +++++++++
 3 files changed, 29 insertions(+)

--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -359,6 +359,19 @@ static struct clk_core *clk_core_get_par
 		return core->parents[index];
 }
 
+struct clk *clk_get_parent_by_index(struct clk *clk, u8 index)
+{
+	struct clk_core *parent;
+
+	if (!clk)
+		return NULL;
+
+	parent = clk_core_get_parent_by_index(clk->core, index);
+
+	return !parent ? NULL : parent->hw->clk;
+}
+EXPORT_SYMBOL_GPL(clk_get_parent_by_index);
+
 struct clk_hw *
 clk_hw_get_parent_by_index(const struct clk_hw *hw, unsigned int index)
 {
@@ -2033,6 +2046,12 @@ static const struct file_operations clk_
 	.release	= single_release,
 };
 
+unsigned int clk_get_num_parents(struct clk *clk)
+{
+	return !clk ? 0 : clk->core->num_parents;
+}
+EXPORT_SYMBOL_GPL(clk_get_num_parents);
+
 static void clk_dump_one(struct seq_file *s, struct clk_core *c, int level)
 {
 	if (!c)
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -656,6 +656,7 @@ unsigned int clk_hw_get_num_parents(cons
 struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw);
 struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw,
 					  unsigned int index);
+struct clk *clk_get_parent_by_index(struct clk *clk, u8 index);
 unsigned int __clk_get_enable_count(struct clk *clk);
 unsigned long clk_hw_get_rate(const struct clk_hw *hw);
 unsigned long __clk_get_flags(struct clk *clk);
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -392,6 +392,15 @@ int clk_set_parent(struct clk *clk, stru
 struct clk *clk_get_parent(struct clk *clk);
 
 /**
+ * clk_get_num_parents - get number of possible parents
+ * @clk: clock source
+ *
+ * Returns the number of possible parents of this clock,
+ * which can then be enumerated using clk_get_parent_by_index().
+ */
+unsigned int clk_get_num_parents(struct clk *clk);
+
+/**
  * clk_get_sys - get a clock based upon the device name
  * @dev_id: device name
  * @con_id: connection ID