linux-kernel - Re: [PATCH] regulator: fan53555: fill set_suspend

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Date:	Tue, 12 Jan 2016 06:28:31 -0800
From:	zhangqing <zhangqing@...k-chips.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
CC:	heiko@...ech.de, lgirdwood@...il.com, broonie@...nel.org,
	huangtao@...k-chips.com, zyw@...k-chips.com,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: fan53555: fill set_suspend_enable/disable
 callback



On 01/11/2016 09:03 PM, Krzysztof Kozlowski wrote:
> 2016-01-12 20:05 GMT+09:00 zhangqing <zhangqing@...k-chips.com>:
>> Setting the set_suspend_enable/disable callback to support
>> enable and disable the dcdc when system is suspend.
>>
>> Signed-off-by: zhangqing <zhangqing@...k-chips.com>
>> ---
>>   drivers/regulator/fan53555.c | 18 ++++++++++++++++++
>>   1 file changed, 18 insertions(+)
>>
>> diff --git a/drivers/regulator/fan53555.c b/drivers/regulator/fan53555.c
>> index 4940e82..2cb5cc3 100644
>> --- a/drivers/regulator/fan53555.c
>> +++ b/drivers/regulator/fan53555.c
>> @@ -114,6 +114,22 @@ static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
>>          return 0;
>>   }
>>
>> +static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
>> +{
>> +       struct fan53555_device_info *di = rdev_get_drvdata(rdev);
>> +
>> +       return regmap_update_bits(di->regmap, di->sleep_reg,
>> +                                 VSEL_BUCK_EN, VSEL_BUCK_EN);
>
> You are just writing the enable_mask (BTW, just use the enable_mask,
> not the value itself in such case) instead of enabling the suspend
> mode. In the disable callback you are just disabling the regulator.
>
> What do you want to achieve with these callbacks?
        return regmap_update_bits(di->regmap, di->sleep_reg,
                                  VSEL_BUCK_EN, VSEL_BUCK_EN);
This callback is setting sleep_reg, setting this dcdc output is enable 
or disable when system enter sleep.
In our system this dcdc need disabled when sleep. But the current 
software not support.

>
> Best regards,
> Krzysztof
>
>> +}
>> +
>> +static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
>> +{
>> +       struct fan53555_device_info *di = rdev_get_drvdata(rdev);
>> +
>> +       return regmap_update_bits(di->regmap, di->sleep_reg,
>> +                                 VSEL_BUCK_EN, 0);
>> +}
>> +
>>   static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
>>   {
>>          struct fan53555_device_info *di = rdev_get_drvdata(rdev);
>> @@ -192,6 +208,8 @@ static struct regulator_ops fan53555_regulator_ops = {
>>          .set_mode = fan53555_set_mode,
>>          .get_mode = fan53555_get_mode,
>>          .set_ramp_delay = fan53555_set_ramp,
>> +       .set_suspend_enable = fan53555_set_suspend_enable,
>> +       .set_suspend_disable = fan53555_set_suspend_disable,
>>   };
>>
>>   static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
>> --
>> 1.9.1
>>
>>
>
>
>