Provide a managed devm_clk_bulk* wrapper to get and enable all
bulk clocks in order to simplify drivers that keeps all clocks
enabled for the time of driver operation.
Suggested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Shradha Todi <shradha.t@xxxxxxxxxxx>
---
drivers/clk/clk-devres.c | 41 ++++++++++++++++++++++++++++++++++++++++
include/linux/clk.h | 25 ++++++++++++++++++++++++
2 files changed, 66 insertions(+)
diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
index 4fb4fd4b06bd..05b0ff4bc1d4 100644
--- a/drivers/clk/clk-devres.c
+++ b/drivers/clk/clk-devres.c
@@ -102,6 +102,7 @@ EXPORT_SYMBOL_GPL(devm_clk_get_optional_enabled);
struct clk_bulk_devres {
struct clk_bulk_data *clks;
int num_clks;
+ void (*exit)(int num_clks, const struct clk_bulk_data *clks);
};
static void devm_clk_bulk_release(struct device *dev, void *res)
@@ -182,6 +183,46 @@ int __must_check devm_clk_bulk_get_all(struct device *dev,
}
EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
+static void devm_clk_bulk_release_all_enabled(struct device *dev, void *res)
+{
+ struct clk_bulk_devres *devres = res;
+
+ if (devres->exit)
+ devres->exit(devres->num_clks, devres->clks);
+
+ clk_bulk_put_all(devres->num_clks, devres->clks);
+}
+
+int __must_check devm_clk_bulk_get_all_enabled(struct device *dev,
+ struct clk_bulk_data **clks, int *num_clks)
+{
+ struct clk_bulk_devres *devres;
+ int ret;
+
+ devres = devres_alloc(devm_clk_bulk_release_all_enabled,
+ sizeof(*devres), GFP_KERNEL);
+ if (!devres)
+ return -ENOMEM;
+
+ ret = clk_bulk_get_all(dev, &devres->clks);
+ if (ret > 0) {
+ *clks = devres->clks;
+ devres->num_clks = ret;
+ *num_clks = ret;
+ devres_add(dev, devres);
+ } else {
+ devres_free(devres);
+ return ret;
+ }
+
+ ret = clk_bulk_prepare_enable(devres->num_clks, *clks);
+ if (!ret)
+ devres->exit = clk_bulk_disable_unprepare;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all_enabled);
+
static int devm_clk_match(struct device *dev, void *res, void *data)
{
struct clk **c = res;
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 1ef013324237..bf3e9bee5754 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -438,6 +438,24 @@ int __must_check devm_clk_bulk_get_optional(struct device *dev, int num_clks,
int __must_check devm_clk_bulk_get_all(struct device *dev,
struct clk_bulk_data **clks);
+/**
+ * devm_clk_bulk_get_all_enabled - managed get multiple clk consumers and
+ * enable all clk
+ * @dev: device for clock "consumer"
+ * @clks: pointer to the clk_bulk_data table of consumer
+ * @num_clks: out parameter to store the number of clk_bulk_data
+ *
+ * Returns success (0) or negative errno.
+ *
+ * This helper function allows drivers to get several clk
+ * consumers and enable all of them in one operation with management.
+ * The clks will automatically be disabled and freed when the device
+ * is unbound.
+ */
+
+int __must_check devm_clk_bulk_get_all_enabled(struct device *dev,
+ struct clk_bulk_data **clks, int *num_clks);
+
/**
* devm_clk_get - lookup and obtain a managed reference to a clock producer.
* @dev: device for clock "consumer"
@@ -960,6 +978,13 @@ static inline int __must_check devm_clk_bulk_get_all(struct device *dev,
return 0;
}
+static inline int __must_check devm_clk_bulk_get_all_enabled(struct device *dev,
+ struct clk_bulk_data **clks, int *num_clks)
+{
+
+ return 0;
+}
+
static inline struct clk *devm_get_clk_from_child(struct device *dev,
struct device_node *np, const char *con_id)
{
--
2.17.1
