ALSA: ASoC: cs4271: add optional soft reset workaround
authorDaniel Mack <zonque@gmail.com>
Mon, 10 Dec 2012 09:30:04 +0000 (10:30 +0100)
committerMark Brown <broonie@opensource.wolfsonmicro.com>
Mon, 24 Dec 2012 15:53:28 +0000 (15:53 +0000)
commitfd23fb9f6bfd43a6e62b2646d18d5ca3edc3ebe3
treea1033cbc88a3ccba164e8d0f6c7469f9efd6713a
parent133d2e6188de86df3ed84cd42ac66e9c5d328c04
ALSA: ASoC: cs4271: add optional soft reset workaround

The CS4271 requires its LRCLK and MCLK to be stable before its RESET
line is de-asserted. That also means that clocks cannot be changed
without putting the chip back into hardware reset, which also requires
a complete re-initialization of all registers.

One (undocumented) workaround is to assert and de-assert the PDN bit
in the MODE2 register.

This patch adds a new flag to both the DT bindings as well as to the
platform data to enable that workaround.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Alexander Sverdlin <subaparts@yandex.ru>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Documentation/devicetree/bindings/sound/cs4271.txt
include/sound/cs4271.h
sound/soc/codecs/cs4271.c