of: reserved_mem: Accessor for acquiring reserved_mem

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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>

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Bjorn Andersson 2017-10-10 22:08:54 -07:00 • committed by Andy Gross

parent a50ff19d06

commit eb297bc716

2 changed files with 31 additions and 0 deletions

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26

drivers/of/of_reserved_mem.c

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5

include/linux/of_reserved_mem.h

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