linux-kernel - Re: [PATCH] regulator: core: Update regulator_is_supported

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Date:	Mon, 12 Nov 2012 10:13:55 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	linux-kernel@...r.kernel.org, philipspatches@...il.com,
	patches@...aro.org
Subject: Re: [PATCH] regulator: core: Update regulator_is_supported_voltage
 for fixed voltages

On 11/09/2012 10:39 PM, Mark Brown wrote:
> On Fri, Nov 09, 2012 at 04:21:49PM +0530, Tushar Behera wrote:
> 
>> In case of fixed regulators for which voltage cannot be changed,
>> regulator_is_supported_voltage should return success only if the
>> min_uV and max_uV parameters are same and it is equal to the current
>> voltage of the regulator.
> 
> This makes no sense to me at all.  The caller is asking if it's possible
> to set the voltage between the minimum and maximum values, any voltage
> in that range should be OK.  Your patch makes the function massively
> less useful.
> 

Ok.

In that case, we should modify the test condition as following.
Currently it passes success when the regulator voltage is less than both
min_uV and max_uV. If ok, I will send another patch for this.

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 1a35251..e90e5c3 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1974,7 +1974,7 @@ int regulator_is_supported_voltage(struct
regulator *regulator,
        if (!(rdev->constraints->valid_ops_mask &
REGULATOR_CHANGE_VOLTAGE)) {
                ret = regulator_get_voltage(regulator);
                if (ret >= 0)
-                       return (min_uV >= ret && ret <= max_uV);
+                       return (ret >= min_uV && ret <= max_uV);
                else
                        return ret;
        }


-- 
Tushar Behera
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