tree 3e3050046c066b150489eb43413bddeeea6c704b
parent 52755b12e30e45501ccea9260d47a2b6aba12a91
author Hans de Goede <hdegoede@redhat.com> 1421001836 +0100
committer Hans de Goede <hdegoede@redhat.com> 1421243800 +0100

sunxi: axp221: Protect axp221_init against multiple calls

The voltage setting code knows it needs to call axp221_init before calling
the various voltage setting functions.

But users of axp utility functions like axp221_get_sid() do not know this,
so the utility functions always call axp221_init() to ensure that the
p2wi / rsb setup magic has been done.

Since doing this repeatedly is quite expensive, add a check to axp221_init
so that it only does the initialization once.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>