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authorBjorn Andersson <bjorn.andersson@linaro.org>2017-10-11 08:08:54 +0300
committerAndy Gross <andy.gross@linaro.org>2017-10-22 13:06:33 +0300
commiteb297bc716ec2cb3147e6e99002e37058c65cba3 (patch)
tree680bcfbebfe7be6feab741dea7d3c41108330dbc /include/linux/of_reserved_mem.h
parenta50ff19d0658d8a09026158448894f06a4521f33 (diff)
downloadlinux-eb297bc716ec2cb3147e6e99002e37058c65cba3.tar.xz
of: reserved_mem: Accessor for acquiring reserved_mem
In some cases drivers referencing a reserved-memory region might want to remap the entire region, but when defining the reserved-memory by "size" the client driver has no means to know the associated base address of the reserved memory region. This patch adds an accessor for such drivers to acquire a handle to their associated reserved-memory for this purpose. A complicating factor for the implementation is that the reserved_mem objects are created from the flattened DeviceTree, as such we can't use the device_node address for comparison. Fortunately the name of the node will be used as "name" of the reserved_mem and will be used when building the full_name, so we can compare the "name" with the basename of the full_name to find the match. Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>
Diffstat (limited to 'include/linux/of_reserved_mem.h')
-rw-r--r--include/linux/of_reserved_mem.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
index f8e1992d6423..c58f780104f9 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_lookup(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_lookup(struct device_node *np)
+{
+ return NULL;
+}
#endif
/**