Re: [PATCH v2 2/5] of: reserved_mem: Accessor for acquiring reserved_mem

Signed-off-by: Bjorn Andersson <redacted>
---

Changes since v1:
- Previous patch provided interface to resolve memory-region reference, instead
  of direct lookup by device_node

 drivers/of/of_reserved_mem.c    | 26 ++++++++++++++++++++++++++
 include/linux/of_reserved_mem.h |  5 +++++
 2 files changed, 31 insertions(+)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index d507c3569a88..b40cfce68fd4 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c

@@ -397,3 +397,29 @@ void of_reserved_mem_device_release(struct device *dev)
        rmem->ops->device_release(rmem, dev);
 }
 EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);
+
+/**
+ * of_reserved_mem_get() - acquire reserved_mem from a device node
+ * @np:                node pointer of the desired reserved-memory region
+ *
+ * This function allows drivers to acquire a reference to the reserved_mem
+ * struct based on a device node handle.
+ *
+ * Returns a reserved_mem reference, or NULL on error.
+ */
+struct reserved_mem *of_reserved_mem_get(struct device_node *np)
+{
+       const char *name;
+       int i;
+
+       if (!np->full_name)
+               return NULL;
+
+       name = kbasename(np->full_name);
+       for (i = 0; i < reserved_mem_count; i++)
+               if (!strcmp(reserved_mem[i].name, name))
+                       return &reserved_mem[i];
+
+       return NULL;
+}
+EXPORT_SYMBOL_GPL(of_reserved_mem_get);

diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
index f8e1992d6423..91b1eb5076e4 100644
--- a/include/linux/of_reserved_mem.h
+++ b/include/linux/of_reserved_mem.h

@@ -44,6 +44,7 @@ int early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
 void fdt_init_reserved_mem(void);
 void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
                               phys_addr_t base, phys_addr_t size);
+struct reserved_mem *of_reserved_mem_get(struct device_node *np);
 #else
 static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
                                        struct device_node *np, int idx)

@@ -55,6 +56,10 @@ static inline void of_reserved_mem_device_release(struct device *pdev) { }
 static inline void fdt_init_reserved_mem(void) { }
 static inline void fdt_reserved_mem_save_node(unsigned long node,
                const char *uname, phys_addr_t base, phys_addr_t size) { }
+static inline struct reserved_mem *of_reserved_mem_get(struct device_node *np)
+{
+       return NULL;
+}
 #endif

 /**
--

2.12.0