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fdt: Document the rest of struct of_bus

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Provide some documentation for the fields of struct of_bus, for
consistency with that provided for the new match field.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Paul Burton 2016-05-17 07:43:25 +01:00 committed by Daniel Schwierzeck
parent 0a222d53d8
commit 49717b18be
1 changed files with 19 additions and 0 deletions
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19
common/fdt_support.c
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@ -966,10 +966,29 @@ static void of_dump_addr(const char *s, const fdt32_t *addr, int na) { }
/**
* struct of_bus - Callbacks for bus specific translators
* @name: A string used to identify this bus in debug output.
* @addresses: The name of the DT property from which addresses are
* to be read, typically "reg".
* @match: Return non-zero if the node whose parent is at
* parentoffset in the FDT blob corresponds to a bus
* of this type, otherwise return zero. If NULL a match
* is assumed.
* @count_cells:Count how many cells (be32 values) a node whose parent
* is at parentoffset in the FDT blob will require to
* represent its address (written to *addrc) & size
* (written to *sizec).
* @map: Map the address addr from the address space of this
* bus to that of its parent, making use of the ranges
* read from DT to an array at range. na and ns are the
* number of cells (be32 values) used to hold and address
* or size, respectively, for this bus. pna is the number
* of cells used to hold an address for the parent bus.
* Returns the address in the address space of the parent
* bus.
* @translate: Update the value of the address cells at addr within an
* FDT by adding offset to it. na specifies the number of
* cells used to hold the address being translated. Returns
* zero on success, non-zero on error.
*
* Each bus type will include a struct of_bus in the of_busses array,
* providing implementations of some or all of the functions used to