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

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Message-id: <5694A6AE.8040404@samsung.com>
Date:	Tue, 12 Jan 2016 16:09:34 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	zhangqing <zhangqing@...k-chips.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 12.01.2016 23:28, zhangqing wrote:
> 
> 
> 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.
> 

I missed that the register is different - sleep_reg instead of
enable_reg. It makes sense and as this is separate register then usage
of desc->enable_mask is up to you, I think.

Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>

Best regards,
Krzysztof