linux-kernel - [PATCH] regulator: twl-regulator: fix n

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Date:	Fri, 27 May 2011 12:25:27 -0700
From:	Colin Cross <ccross@...roid.com>
To:	linux-kernel@...r.kernel.org
Cc:	Colin Cross <ccross@...roid.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regulator: twl-regulator: fix n_voltages for twl6030 variable LDOs

The n_voltages initializer for the TWL6030_ADJUSTABLE_LDO macro is
off by one, causing the the highest supported voltage to be
unreachable.  Setting the machine constraints to only allow the
highest voltage causes errors:

machine_constraints_voltage: VAUX3_6030: unsupportable voltage constraints
twl_reg twl_reg.39: can't register VAUX3_6030, -22
twl_reg: probe of twl_reg.39 failed with error -22

This patch fixes the off by one error.  Tested by setting
VAUX3_6030 to 3.3V.

Signed-off-by: Colin Cross <ccross@...roid.com>
---
 drivers/regulator/twl-regulator.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c
index 6a29285..afd9c7e 100644
--- a/drivers/regulator/twl-regulator.c
+++ b/drivers/regulator/twl-regulator.c
@@ -520,7 +520,7 @@ static struct regulator_ops twl6030_fixed_resource = {
 	.desc = { \
 		.name = #label, \
 		.id = TWL6030_REG_##label, \
-		.n_voltages = (max_mVolts - min_mVolts)/100, \
+		.n_voltages = (max_mVolts - min_mVolts)/100 + 1, \
 		.ops = &twl6030ldo_ops, \
 		.type = REGULATOR_VOLTAGE, \
 		.owner = THIS_MODULE, \
-- 
1.7.4.1

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