1 files changed, 234 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/083-0002-clk-Add-clk_hw-OF-clk-providers.patch b/target/linux/generic/patches-4.4/083-0002-clk-Add-clk_hw-OF-clk-providers.patch
new file mode 100644
index 0000000000..0bcb5bb805
--- /dev/null
+++ b/target/linux/generic/patches-4.4/083-0002-clk-Add-clk_hw-OF-clk-providers.patch
@@ -0,0 +1,234 @@
+From 0861e5b8cf80038e91942f1005c8dfce79d18c38 Mon Sep 17 00:00:00 2001
+From: Stephen Boyd <sboyd@codeaurora.org>
+Date: Fri, 5 Feb 2016 17:38:26 -0800
+Subject: [PATCH] clk: Add clk_hw OF clk providers
+
+Now that we have a clk registration API that doesn't return
+struct clks, we need to have some way to hand out struct clks via
+the clk_get() APIs that doesn't involve associating struct clk
+pointers with an OF node. Currently we ask the OF provider to
+give us a struct clk pointer for some clkspec, turn that struct
+clk into a struct clk_hw and then allocate a new struct clk to
+return to the caller.
+
+Let's add a clk_hw based OF provider hook that returns a struct
+clk_hw directly, so that we skip the intermediate step of
+converting from struct clk to struct clk_hw. Eventually when
+we've converted all OF clk providers to struct clk_hw based APIs
+we can remove the struct clk based ones.
+
+It should also be noted that we change the onecell provider to
+have a flex array instead of a pointer for the array of clk_hw
+pointers. This allows providers to allocate one structure of the
+correct length in one step instead of two.
+
+Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
+---
+ drivers/clk/clk.c            | 85 +++++++++++++++++++++++++++++++++++++++++---
+ include/linux/clk-provider.h | 30 ++++++++++++++++
+ 2 files changed, 111 insertions(+), 4 deletions(-)
+
+--- a/drivers/clk/clk.c
++++ b/drivers/clk/clk.c
+@@ -3001,6 +3001,7 @@ struct of_clk_provider {
+ 
+ 	struct device_node *node;
+ 	struct clk *(*get)(struct of_phandle_args *clkspec, void *data);
++	struct clk_hw *(*get_hw)(struct of_phandle_args *clkspec, void *data);
+ 	void *data;
+ };
+ 
+@@ -3017,6 +3018,12 @@ struct clk *of_clk_src_simple_get(struct
+ }
+ EXPORT_SYMBOL_GPL(of_clk_src_simple_get);
+ 
++struct clk_hw *of_clk_hw_simple_get(struct of_phandle_args *clkspec, void *data)
++{
++	return data;
++}
++EXPORT_SYMBOL_GPL(of_clk_hw_simple_get);
++
+ struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data)
+ {
+ 	struct clk_onecell_data *clk_data = data;
+@@ -3031,6 +3038,21 @@ struct clk *of_clk_src_onecell_get(struc
+ }
+ EXPORT_SYMBOL_GPL(of_clk_src_onecell_get);
+ 
++struct clk_hw *
++of_clk_hw_onecell_get(struct of_phandle_args *clkspec, void *data)
++{
++	struct clk_hw_onecell_data *hw_data = data;
++	unsigned int idx = clkspec->args[0];
++
++	if (idx >= hw_data->num) {
++		pr_err("%s: invalid index %u\n", __func__, idx);
++		return ERR_PTR(-EINVAL);
++	}
++
++	return hw_data->hws[idx];
++}
++EXPORT_SYMBOL_GPL(of_clk_hw_onecell_get);
++
+ /**
+  * of_clk_add_provider() - Register a clock provider for a node
+  * @np: Device node pointer associated with clock provider
+@@ -3067,6 +3089,41 @@ int of_clk_add_provider(struct device_no
+ EXPORT_SYMBOL_GPL(of_clk_add_provider);
+ 
+ /**
++ * of_clk_add_hw_provider() - Register a clock provider for a node
++ * @np: Device node pointer associated with clock provider
++ * @get: callback for decoding clk_hw
++ * @data: context pointer for @get callback.
++ */
++int of_clk_add_hw_provider(struct device_node *np,
++			   struct clk_hw *(*get)(struct of_phandle_args *clkspec,
++						 void *data),
++			   void *data)
++{
++	struct of_clk_provider *cp;
++	int ret;
++
++	cp = kzalloc(sizeof(*cp), GFP_KERNEL);
++	if (!cp)
++		return -ENOMEM;
++
++	cp->node = of_node_get(np);
++	cp->data = data;
++	cp->get_hw = get;
++
++	mutex_lock(&of_clk_mutex);
++	list_add(&cp->link, &of_clk_providers);
++	mutex_unlock(&of_clk_mutex);
++	pr_debug("Added clk_hw provider from %s\n", np->full_name);
++
++	ret = of_clk_set_defaults(np, true);
++	if (ret < 0)
++		of_clk_del_provider(np);
++
++	return ret;
++}
++EXPORT_SYMBOL_GPL(of_clk_add_hw_provider);
++
++/**
+  * of_clk_del_provider() - Remove a previously registered clock provider
+  * @np: Device node pointer associated with clock provider
+  */
+@@ -3087,11 +3144,32 @@ void of_clk_del_provider(struct device_n
+ }
+ EXPORT_SYMBOL_GPL(of_clk_del_provider);
+ 
++static struct clk_hw *
++__of_clk_get_hw_from_provider(struct of_clk_provider *provider,
++			      struct of_phandle_args *clkspec)
++{
++	struct clk *clk;
++	struct clk_hw *hw = ERR_PTR(-EPROBE_DEFER);
++
++	if (provider->get_hw) {
++		hw = provider->get_hw(clkspec, provider->data);
++	} else if (provider->get) {
++		clk = provider->get(clkspec, provider->data);
++		if (!IS_ERR(clk))
++			hw = __clk_get_hw(clk);
++		else
++			hw = ERR_CAST(clk);
++	}
++
++	return hw;
++}
++
+ struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec,
+ 				       const char *dev_id, const char *con_id)
+ {
+ 	struct of_clk_provider *provider;
+ 	struct clk *clk = ERR_PTR(-EPROBE_DEFER);
++	struct clk_hw *hw = ERR_PTR(-EPROBE_DEFER);
+ 
+ 	if (!clkspec)
+ 		return ERR_PTR(-EINVAL);
+@@ -3100,10 +3178,9 @@ struct clk *__of_clk_get_from_provider(s
+ 	mutex_lock(&of_clk_mutex);
+ 	list_for_each_entry(provider, &of_clk_providers, link) {
+ 		if (provider->node == clkspec->np)
+-			clk = provider->get(clkspec, provider->data);
+-		if (!IS_ERR(clk)) {
+-			clk = __clk_create_clk(__clk_get_hw(clk), dev_id,
+-					       con_id);
++			hw = __of_clk_get_hw_from_provider(provider, clkspec);
++		if (!IS_ERR(hw)) {
++			clk = __clk_create_clk(hw, dev_id, con_id);
+ 
+ 			if (!IS_ERR(clk) && !__clk_get(clk)) {
+ 				__clk_free_clk(clk);
+--- a/include/linux/clk-provider.h
++++ b/include/linux/clk-provider.h
+@@ -693,6 +693,11 @@ struct clk_onecell_data {
+ 	unsigned int clk_num;
+ };
+ 
++struct clk_hw_onecell_data {
++	size_t num;
++	struct clk_hw *hws[];
++};
++
+ extern struct of_device_id __clk_of_table;
+ 
+ #define CLK_OF_DECLARE(name, compat, fn) OF_DECLARE_1(clk, name, compat, fn)
+@@ -702,10 +707,19 @@ int of_clk_add_provider(struct device_no
+ 			struct clk *(*clk_src_get)(struct of_phandle_args *args,
+ 						   void *data),
+ 			void *data);
++int of_clk_add_hw_provider(struct device_node *np,
++			   struct clk_hw *(*get)(struct of_phandle_args *clkspec,
++						 void *data),
++			   void *data);
+ void of_clk_del_provider(struct device_node *np);
+ struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
+ 				  void *data);
++
++struct clk_hw *of_clk_hw_simple_get(struct of_phandle_args *clkspec,
++				    void *data);
+ struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);
++struct clk_hw *of_clk_hw_onecell_get(struct of_phandle_args *clkspec,
++				     void *data);
+ int of_clk_get_parent_count(struct device_node *np);
+ int of_clk_parent_fill(struct device_node *np, const char **parents,
+ 		       unsigned int size);
+@@ -722,6 +736,13 @@ static inline int of_clk_add_provider(st
+ {
+ 	return 0;
+ }
++static inline int of_clk_add_hw_provider(struct device_node *np,
++			struct clk_hw *(*get)(struct of_phandle_args *clkspec,
++					      void *data),
++			void *data)
++{
++	return 0;
++}
+ #define of_clk_del_provider(np) \
+ 	{ while (0); }
+ static inline struct clk *of_clk_src_simple_get(
+@@ -729,11 +750,21 @@ static inline struct clk *of_clk_src_sim
+ {
+ 	return ERR_PTR(-ENOENT);
+ }
++static inline struct clk_hw *
++of_clk_hw_simple_get(struct of_phandle_args *clkspec, void *data)
++{
++	return ERR_PTR(-ENOENT);
++}
+ static inline struct clk *of_clk_src_onecell_get(
+ 	struct of_phandle_args *clkspec, void *data)
+ {
+ 	return ERR_PTR(-ENOENT);
+ }
++static inline struct clk_hw *
++of_clk_hw_onecell_get(struct of_phandle_args *clkspec, void *data)
++{
++	return ERR_PTR(-ENOENT);
++}
+ static inline int of_clk_get_parent_count(struct device_node *np)
+ {
+ 	return 0;