linux-kernel - [PATCH] cpufreq: mediatek: Use REGCACHE

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Message-Id: <1448878338-28496-1-git-send-email-djkurtz@chromium.org>
Date:	Mon, 30 Nov 2015 18:12:18 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Daniel Kurtz <djkurtz@...omium.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	linux-kernel@...r.kernel.org (open list:VOLTAGE AND CURRENT REGULATOR
	FRAMEWORK),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC
	support),
	linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
	support)
Subject: [PATCH] cpufreq: mediatek: Use REGCACHE_RBTREE

This regulator is on a slow i2c bus.  Register accesses are very simple,
they all either enable/disable a regulator channel, or select a new
voltage level.  Thus, reading registers from the device will always
return what was last written.

Therefore we can save a lot of time when reading registers by using a
regmap_cache.  Since the register map is relatively large, but we only
ever access a few of them, we use an RBTREE cache.

Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
---
 drivers/regulator/mt6311-regulator.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/regulator/mt6311-regulator.c b/drivers/regulator/mt6311-regulator.c
index 02c4e5f..0495716 100644
--- a/drivers/regulator/mt6311-regulator.c
+++ b/drivers/regulator/mt6311-regulator.c
@@ -30,6 +30,7 @@ static const struct regmap_config mt6311_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = MT6311_FQMTR_CON4,
+	.cache_type = REGCACHE_RBTREE,
 };
 
 /* Default limits measured in millivolts and milliamps */
-- 
2.6.0.rc2.230.g3dd15c0

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