[PATCH v2 1/8] regmap: Add devm_regmap_init()

[Pratyush Yadav <p.yadav@ti.com>]

From: Jean-Jacques Hiblot <jjhiblot@ti.com>

Most of new linux drivers are using managed-API to allocate resources. To
ease porting drivers from linux to U-Boot, introduce devm_regmap_init() as
a managed API to get a regmap from the device tree.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/core/regmap.c | 29 +++++++++++++++++++++++++++++
 include/regmap.h      | 18 ++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c
index a67a237b88..74225361fd 100644
--- a/drivers/core/regmap.c
+++ b/drivers/core/regmap.c
@@ -14,7 +14,10 @@
 #include <regmap.h>
 #include <asm/io.h>
 #include <dm/of_addr.h>
+#include <dm/devres.h>
 #include <linux/ioport.h>
+#include <linux/compat.h>
+#include <linux/err.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -228,6 +231,32 @@ err:
 
 	return ret;
 }
+
+static void devm_regmap_release(struct udevice *dev, void *res)
+{
+	regmap_uninit(*(struct regmap **)res);
+}
+
+struct regmap *devm_regmap_init(struct udevice *dev,
+				const struct regmap_bus *bus,
+				void *bus_context,
+				const struct regmap_config *config)
+{
+	int rc;
+	struct regmap **mapp;
+
+	mapp = devres_alloc(devm_regmap_release, sizeof(struct regmap *),
+			    __GFP_ZERO);
+	if (unlikely(!mapp))
+		return ERR_PTR(-ENOMEM);
+
+	rc = regmap_init_mem(dev_ofnode(dev), mapp);
+	if (rc)
+		return ERR_PTR(rc);
+
+	devres_add(dev, mapp);
+	return *mapp;
+}
 #endif
 
 void *regmap_get_range(struct regmap *map, unsigned int range_num)
diff --git a/include/regmap.h b/include/regmap.h
index 30183c5e71..c7dd240a74 100644
--- a/include/regmap.h
+++ b/include/regmap.h
@@ -75,6 +75,9 @@ struct regmap_range {
 	ulong size;
 };
 
+struct regmap_bus;
+struct regmap_config;
+
 /**
  * struct regmap - a way of accessing hardware/bus registers
  *
@@ -335,6 +338,21 @@ int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
 
 int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index);
 
+/**
+ * devm_regmap_init() - Initialise register map (device managed)
+ *
+ * @dev: Device that will be interacted with
+ * @bus: Bus-specific callbacks to use with device (IGNORED)
+ * @bus_context: Data passed to bus-specific callbacks (IGNORED)
+ * @config: Configuration for register map (IGNORED)
+ *
+ * @Return a valid pointer to a struct regmap or a ERR_PTR() on error.
+ * The structure is automatically freed when the device is unbound
+ */
+struct regmap *devm_regmap_init(struct udevice *dev,
+				const struct regmap_bus *bus,
+				void *bus_context,
+				const struct regmap_config *config);
 /**
  * regmap_get_range() - Obtain the base memory address of a regmap range
  *
-- 
2.27.0