clk: mediatek: add of_xlate ops

Add driver-specific of_xlate ops for MediaTek clocks. This provides
better checking of the args passed from the devicetree. Compared to
the default of_xlate implementation, this will return -EINVAL if there
are zero args (id is always required) and -ENOENT if the id is out of
range for the clock type. This will protect against out of bounds array
accesses later on when the clk->id is used to index into the clock
data arrays.

If there is a id_offs_map, then we have to do that translation first
before checking the id to see if it is in range. There is no sense in
doing the mapping multiple times, so we save the mapped ID in clk->id
and remove mtk_clk_get_id().

mtk_clk_find_parent_rate() also had to be updated since it creates a
temporary struct clk to represent the parent clock. It now has do the
translation in case the parent clock also uses an id_offs_map.

Signed-off-by: David Lechner <[email protected]>

0 files changed, 0 insertions, 0 deletions