Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/clk/clk-bulk.c | 80 ++++++++++++++++++++++++++++++++++++++++++
include/linux/clk.h | 42 ++++++++++++++++++++++
2 files changed, 122 insertions(+)
diff --git a/drivers/clk/clk-bulk.c b/drivers/clk/clk-bulk.c
index ddbe32f9c2..b8db60dcbc 100644
--- a/drivers/clk/clk-bulk.c
+++ b/drivers/clk/clk-bulk.c
@@ -53,6 +53,86 @@ err:
}
EXPORT_SYMBOL(clk_bulk_get);
+static int __must_check of_clk_bulk_get(struct device_node *np, int num_clks,
+ struct clk_bulk_data *clks)
+{
+ int ret;
+ int i;
+
+ for (i = 0; i < num_clks; i++) {
+ clks[i].id = NULL;
+ clks[i].clk = NULL;
+ }
+
+ for (i = 0; i < num_clks; i++) {
+ of_property_read_string_index(np, "clock-names", i, &clks[i].id);
+ clks[i].clk = of_clk_get(np, i);
+ if (IS_ERR(clks[i].clk)) {
+ ret = PTR_ERR(clks[i].clk);
+ pr_err("%pOF: Failed to get clk index: %d ret: %d\n",
+ np, i, ret);
+ clks[i].clk = NULL;
+ goto err;
+ }
+ }
+
+ return 0;
+
+err:
+ clk_bulk_put(i, clks);
+
+ return ret;
+}
+
+static int __must_check of_clk_bulk_get_all(struct device_node *np,
+ struct clk_bulk_data **clks)
+{
+ struct clk_bulk_data *clk_bulk;
+ int num_clks;
+ int ret;
+
+ num_clks = of_clk_get_parent_count(np);
+ if (!num_clks)
+ return 0;
+
+ clk_bulk = kmalloc_array(num_clks, sizeof(*clk_bulk), GFP_KERNEL);
+ if (!clk_bulk)
+ return -ENOMEM;
+
+ ret = of_clk_bulk_get(np, num_clks, clk_bulk);
+ if (ret) {
+ kfree(clk_bulk);
+ return ret;
+ }
+
+ *clks = clk_bulk;
+
+ return num_clks;
+}
+
+void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks)
+{
+ if (IS_ERR_OR_NULL(clks))
+ return;
+
+ clk_bulk_put(num_clks, clks);
+
+ kfree(clks);
+}
+EXPORT_SYMBOL(clk_bulk_put_all);
+
+int __must_check clk_bulk_get_all(struct device_d *dev,
+ struct clk_bulk_data **clks)
+{
+ struct device_node *np = dev->device_node;
+
+ if (!np)
+ return 0;
+
+ return of_clk_bulk_get_all(np, clks);
+}
+EXPORT_SYMBOL(clk_bulk_get_all);
+
/**
* clk_bulk_disable - gate a set of clocks
* @num_clks: the number of clk_bulk_data
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 3d66343e8d..86056d1c0f 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -82,6 +82,27 @@ struct clk *clk_get(struct device_d *dev, const char *id);
int __must_check clk_bulk_get(struct device_d *dev, int num_clks,
struct clk_bulk_data *clks);
+/**
+ * clk_bulk_get_all - lookup and obtain all available references to clock
+ * producer.
+ * @dev: device for clock "consumer"
+ * @clks: pointer to the clk_bulk_data table of consumer
+ *
+ * This helper function allows drivers to get all clk consumers in one
+ * operation. If any of the clk cannot be acquired then any clks
+ * that were obtained will be freed before returning to the caller.
+ *
+ * Returns a positive value for the number of clocks obtained while the
+ * clock references are stored in the clk_bulk_data table in @clks field.
+ * Returns 0 if there're none and a negative value if something failed.
+ *
+ * Drivers must assume that the clock source is not enabled.
+ *
+ * clk_bulk_get should not be called from within interrupt context.
+ */
+int __must_check clk_bulk_get_all(struct device_d *dev,
+ struct clk_bulk_data **clks);
+
/**
* clk_enable - inform the system when the clock source should be running.
* @clk: clock source
@@ -156,6 +177,19 @@ unsigned long clk_get_rate(struct clk *clk);
*/
void clk_bulk_put(int num_clks, struct clk_bulk_data *clks);
+/**
+ * clk_bulk_put_all - "free" all the clock source
+ * @num_clks: the number of clk_bulk_data
+ * @clks: the clk_bulk_data table of consumer
+ *
+ * Note: drivers must ensure that all clk_bulk_enable calls made on this
+ * clock source are balanced by clk_bulk_disable calls prior to calling
+ * this function.
+ *
+ * clk_bulk_put_all should not be called from within interrupt context.
+ */
+void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks);
+
/*
* The remaining APIs are optional for machine class support.
*/
@@ -240,8 +274,16 @@ static inline int __must_check clk_bulk_get(struct device_d *dev, int num_clks,
return 0;
}
+static inline int __must_check clk_bulk_get_all(struct device *dev,
+ struct clk_bulk_data **clks)
+{
+ return 0;
+}
+
static inline void clk_bulk_put(int num_clks, struct clk_bulk_data *clks) {}
+static inline void clk_bulk_put_all(int num_clks, struct clk_bulk_data *clks) {}
+
static inline int clk_enable(struct clk *clk)
{
return 0;
--
2.28.0
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