linux-kernel - Re: [PATCH 10/18 v2] regulator: s2mps11: Pass descriptor instead of GPIO number

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Date:   Mon, 14 May 2018 11:40:14 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        Sangbeom Kim <sbkim73@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [PATCH 10/18 v2] regulator: s2mps11: Pass descriptor instead of
 GPIO number

On Mon, May 14, 2018 at 9:59 AM, Krzysztof Kozlowski <krzk@...nel.org> wrote:
> On Mon, Apr 23, 2018 at 1:07 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
>> Instead of passing a global GPIO number for the enable GPIO, pass
>> a descriptor looked up with the standard devm_gpiod_get_optional()
>> call.
>>
>> This regulator supports passing platform data, but enable/sleep
>> regulators are looked up from the device tree exclusively, so
>> we can need not touch other files.
>>
>> Cc: Krzysztof Kozlowski <krzk@...nel.org>
>> Cc: Sangbeom Kim <sbkim73@...sung.com>
>> Cc: Chanwoo Choi <cw00.choi@...sung.com>
>> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
>> ---
>> ChangeLog v1->v2:
>> - Rebase the patch on the other changes.
>> ---
>>  drivers/regulator/s2mps11.c | 46 ++++++++++++++++++++++-----------------------
>>  1 file changed, 23 insertions(+), 23 deletions(-)
>>
>> diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
>> index 7726b874e539..9a1dca26362e 100644
>> --- a/drivers/regulator/s2mps11.c
>> +++ b/drivers/regulator/s2mps11.c
>> @@ -18,7 +18,7 @@
>>
>>  #include <linux/bug.h>
>>  #include <linux/err.h>
>> -#include <linux/gpio.h>
>> +#include <linux/gpio/consumer.h>
>>  #include <linux/slab.h>
>>  #include <linux/module.h>
>>  #include <linux/of.h>
>> @@ -27,7 +27,6 @@
>>  #include <linux/regulator/driver.h>
>>  #include <linux/regulator/machine.h>
>>  #include <linux/regulator/of_regulator.h>
>> -#include <linux/of_gpio.h>
>>  #include <linux/mfd/samsung/core.h>
>>  #include <linux/mfd/samsung/s2mps11.h>
>>  #include <linux/mfd/samsung/s2mps13.h>
>> @@ -57,7 +56,7 @@ struct s2mps11_info {
>>          * Array (size: number of regulators) with GPIO-s for external
>>          * sleep control.
>>          */
>> -       int *ext_control_gpio;
>> +       struct gpio_desc **ext_control_gpiod;
>>  };
>>
>>  static int get_ramp_delay(int ramp_delay)
>> @@ -524,7 +523,7 @@ static int s2mps14_regulator_enable(struct regulator_dev *rdev)
>>         case S2MPS14X:
>>                 if (test_bit(rdev_get_id(rdev), s2mps11->suspend_state))
>>                         val = S2MPS14_ENABLE_SUSPEND;
>> -               else if (gpio_is_valid(s2mps11->ext_control_gpio[rdev_get_id(rdev)]))
>> +               else if (s2mps11->ext_control_gpiod[rdev_get_id(rdev)])
>>                         val = S2MPS14_ENABLE_EXT_CONTROL;
>>                 else
>>                         val = rdev->desc->enable_mask;
>> @@ -818,7 +817,7 @@ static int s2mps14_pmic_enable_ext_control(struct s2mps11_info *s2mps11,
>>  static void s2mps14_pmic_dt_parse_ext_control_gpio(struct platform_device *pdev,
>>                 struct of_regulator_match *rdata, struct s2mps11_info *s2mps11)
>>  {
>> -       int *gpio = s2mps11->ext_control_gpio;
>> +       struct gpio_desc **gpio = s2mps11->ext_control_gpiod;
>>         unsigned int i;
>>         unsigned int valid_regulators[3] = { S2MPS14_LDO10, S2MPS14_LDO11,
>>                 S2MPS14_LDO12 };
>> @@ -829,11 +828,20 @@ static void s2mps14_pmic_dt_parse_ext_control_gpio(struct platform_device *pdev,
>>                 if (!rdata[reg].init_data || !rdata[reg].of_node)
>>                         continue;
>>
>> -               gpio[reg] = of_get_named_gpio(rdata[reg].of_node,
>> -                               "samsung,ext-control-gpios", 0);
>> -               if (gpio_is_valid(gpio[reg]))
>> -                       dev_dbg(&pdev->dev, "Using GPIO %d for ext-control over %d/%s\n",
>> -                                       gpio[reg], reg, rdata[reg].name);
>> +               gpio[reg] = devm_gpiod_get_from_of_node(&pdev->dev,
>> +                                                       rdata[reg].of_node,
>> +                                                       "samsung,ext-control-gpios",
>> +                                                       0,
>> +                                                       GPIOD_OUT_HIGH,
>> +                                                       "s2mps11-LDO");
>
> The same as with max77686 - this can be also for bucks so how about
> the name of "s2mps11-regulator"?

With the name change:
Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>

Tested on Odroid XU3 (with s2mps11 although not using any GPIOs for
regulators, so at least default paths are not broken):
Tested-by: Krzysztof Kozlowski <krzk@...nel.org>

Best regards,
Krzysztof