From: Guodong Xu <guodong.xu@linaro.org>
Date: Wed, 13 Aug 2014 11:33:42 +0000 (+0800)
Subject: regulator: add driver for hi6421 voltage regulator
X-Git-Tag: fixes-for-v3.18-merge-window~31^2~3^5~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=87ca186f7eb663fc5e52b65452a91fe0fec170a0;p=pandora-kernel.git

regulator: add driver for hi6421 voltage regulator

Add driver support for HiSilicon Hi6421 voltage regulators.

Two rules for regulator enabling are defined in hi6421 spec:
1) Between disable and enable of each regulator (LDOs or BUCKs), there must
   be a protection gap. Use @off_on_delay of regulator core to implement this.
2) No two regulators can be enabled at the same time. Use mutex in
   hi6421_regulator_pdata to ensure this. A protection gap of 100us is added
   into each LDO/BUCK's .enable_time.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
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