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-rw-r--r--target/linux/generic/pending-4.4/083-0002-clk-Add-clk_hw-OF-clk-providers.patch234
1 files changed, 234 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.4/083-0002-clk-Add-clk_hw-OF-clk-providers.patch b/target/linux/generic/pending-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/pending-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;