From: Thierry Reding <treding@xxxxxxxxxx>
Add support for looking up memory regions by name. This looks up the
given name in the newly introduced memory-region-names property and
returns the memory region at the corresponding index in the memory-
region(s) property.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/of/of_reserved_mem.c | 19 +++++++++++++++++++
include/linux/of_reserved_mem.h | 11 +++++++++++
2 files changed, 30 insertions(+)
diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 1a84bc0d5fa8..ed2ff6f01d32 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -357,6 +357,25 @@ int of_reserved_mem_device_init_by_idx(struct device *dev,
}
EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_idx);
+/**
+ * of_reserved_mem_device_init_by_name() - assign named reserved memory region
+ * to given device
+ * @dev: pointer to the device to configure
+ * @np: pointer to the device node with 'memory-region' property
+ * @name: name of the selected memory region
+ *
+ * Returns: 0 on success or a negative error-code on failure.
+ */
+int of_reserved_mem_device_init_by_name(struct device *dev,
+ struct device_node *np,
+ const char *name)
+{
+ int idx = of_property_match_string(np, "memory-region-names", name);
+
+ return of_reserved_mem_device_init_by_idx(dev, np, idx);
+}
+EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_name);
+
/**
* of_reserved_mem_device_release() - release reserved memory device structures
* @dev: Pointer to the device to deconfigure
diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
index 60f541912ccf..a1b427ac291b 100644
--- a/include/linux/of_reserved_mem.h
+++ b/include/linux/of_reserved_mem.h
@@ -33,6 +33,9 @@ typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);
int of_reserved_mem_device_init_by_idx(struct device *dev,
struct device_node *np, int idx);
+int of_reserved_mem_device_init_by_name(struct device *dev,
+ struct device_node *np,
+ const char *name);
void of_reserved_mem_device_release(struct device *dev);
void fdt_init_reserved_mem(void);
@@ -45,6 +48,14 @@ static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
{
return -ENOSYS;
}
+
+static inline int of_reserved_mem_device_init_by_name(struct device *dev,
+ struct device_node *np,
+ const char *name)
+{
+ return -ENOSYS;
+}
+
static inline void of_reserved_mem_device_release(struct device *pdev) { }
static inline void fdt_init_reserved_mem(void) { }
--
2.24.1
