linux-kernel - Re: [PATCH] Regulators: lp3971 - Fix setting val for LDO2 and LDO4

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Date:	Tue, 9 Mar 2010 14:27:24 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	axel lin <axel.lin@...il.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Cc:	linux-kernel@...r.kernel.org, lrg@...mlogic.co.uk
Subject: Re: [PATCH] Regulators: lp3971 - Fix setting val for LDO2 and LDO4

On Tue, Mar 09, 2010 at 05:14:53PM +0800, axel lin wrote:
> From 4e4c5f8267a4fbf651b4cc26c5f72465514f6224 Mon Sep 17 00:00:00 2001
> From: Axel Lin <axel.lin@...il.com>
> Date: Tue, 9 Mar 2010 16:53:59 +0800
> Subject: [PATCH] lp3971: Fix setting val for LDO2 and LDO4

Please try to follow the instructions for submitting patches in
Documentation/SubmittingPatches - this is missing Signed-off-by and CCs
to maintainers.

> In lp3971_ldo_set_voltage function, it requires val to left shift 4
> bits for LDO2 and LDO4.
> This patch fix this issue.

CCing in the folks who worked with the hardware for confirmation - the
patch looks OK to me but it's surprising that this wasn't noticed when
the driver was being developed, it might be that the chip is doing
something strange here.

> ---
>  drivers/regulator/lp3971.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/regulator/lp3971.c b/drivers/regulator/lp3971.c
> index f5532ed..a28ae37 100644
> --- a/drivers/regulator/lp3971.c
> +++ b/drivers/regulator/lp3971.c
> @@ -187,7 +187,8 @@ static int lp3971_ldo_set_voltage(struct regulator_dev *dev,
>                 return -EINVAL;
> 
>         return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
> -               LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo), val);
> +               LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
> +               val << LDO_VOL_CONTR_SHIFT(ldo));
>  }
> 
>  static struct regulator_ops lp3971_ldo_ops = {
--
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