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| author | Bjorn Andersson <bjorn.andersson@linaro.org> | 2017-10-10 22:08:54 -0700 |
|---|---|---|
| committer | Andy Gross <andy.gross@linaro.org> | 2017-10-22 05:06:33 -0500 |
| commit | eb297bc716ec2cb3147e6e99002e37058c65cba3 (patch) | |
| tree | 680bcfbebfe7be6feab741dea7d3c41108330dbc /include/linux/of_reserved_mem.h | |
| parent | a50ff19d0658d8a09026158448894f06a4521f33 (diff) | |
| download | lwn-eb297bc716ec2cb3147e6e99002e37058c65cba3.tar.gz lwn-eb297bc716ec2cb3147e6e99002e37058c65cba3.zip | |
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.h | 5 |
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 /** |