diff mbox

[1/2] mfd: s2mps11: Add manual shutdown method for Odroid XU3

Message ID 1438605447-6836-2-git-send-email-k.kozlowski.k@gmail.com
State New, archived
Headers show

Commit Message

Krzysztof Kozlowski Aug. 3, 2015, 12:37 p.m. UTC
On Odroid XU3 board (with S2MPS11 PMIC) the PWRHOLD bit in CTRL1
register must be manually set to 0 before initiating power off sequence.

One of usual power down methods for Exynos based devices looks like:
1. PWRHOLD pin of PMIC is connected to PSHOLD of Exynos.
2. Exynos holds up this pin during system operation.
3. ACOKB pin of PMIC is pulled up to VBATT and optionally to pin in
   other device.
4. When PWRHOLD/PSHOLD goes low, the PMIC will turn off the power if
   ACOKB goes high.

On Odroid XU3 family the difference is in (3) - the ACOKB is grounded.
This means that PMIC must manually set PWRHOLD field to low and then
wait for signal from Application Processor (the usual change in
PWRHOLD/PSHOLD pin will actually cut off the power).

The patch adds respective binding allowing Odroid XU3 device to be
powered off.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Reported-by: Anand Moon <linux.amoon@gmail.com>

---

Patch is losely based on patch in Hardkernel repository [0] and previous
work of Anand Moon [1].

[0] https://github.com/hardkernel/linux/commit/6897e62ba328bd1c8c095d918101863250cd73e7
[1] http://www.spinics.net/lists/linux-samsung-soc/msg45959.html
---
 Documentation/devicetree/bindings/mfd/s2mps11.txt |  4 +++
 drivers/mfd/sec-core.c                            | 31 +++++++++++++++++++++++
 include/linux/mfd/samsung/core.h                  |  2 ++
 include/linux/mfd/samsung/s2mps11.h               |  1 +
 4 files changed, 38 insertions(+)

Comments

Anand Moon Aug. 3, 2015, 6:52 p.m. UTC | #1
Hi Krzysztof,

On 3 August 2015 at 18:07, Krzysztof Kozlowski <k.kozlowski.k@gmail.com> wrote:
> On Odroid XU3 board (with S2MPS11 PMIC) the PWRHOLD bit in CTRL1
> register must be manually set to 0 before initiating power off sequence.
>
> One of usual power down methods for Exynos based devices looks like:
> 1. PWRHOLD pin of PMIC is connected to PSHOLD of Exynos.
> 2. Exynos holds up this pin during system operation.
> 3. ACOKB pin of PMIC is pulled up to VBATT and optionally to pin in
>    other device.
> 4. When PWRHOLD/PSHOLD goes low, the PMIC will turn off the power if
>    ACOKB goes high.
>
> On Odroid XU3 family the difference is in (3) - the ACOKB is grounded.
> This means that PMIC must manually set PWRHOLD field to low and then
> wait for signal from Application Processor (the usual change in
> PWRHOLD/PSHOLD pin will actually cut off the power).
>
> The patch adds respective binding allowing Odroid XU3 device to be
> powered off.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
> Reported-by: Anand Moon <linux.amoon@gmail.com>
>
> ---
>
> Patch is losely based on patch in Hardkernel repository [0] and previous
> work of Anand Moon [1].
>
> [0] https://github.com/hardkernel/linux/commit/6897e62ba328bd1c8c095d918101863250cd73e7
> [1] http://www.spinics.net/lists/linux-samsung-soc/msg45959.html
> ---
>  Documentation/devicetree/bindings/mfd/s2mps11.txt |  4 +++
>  drivers/mfd/sec-core.c                            | 31 +++++++++++++++++++++++
>  include/linux/mfd/samsung/core.h                  |  2 ++
>  include/linux/mfd/samsung/s2mps11.h               |  1 +
>  4 files changed, 38 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mfd/s2mps11.txt b/Documentation/devicetree/bindings/mfd/s2mps11.txt
> index 57a045016fca..90eaef393325 100644
> --- a/Documentation/devicetree/bindings/mfd/s2mps11.txt
> +++ b/Documentation/devicetree/bindings/mfd/s2mps11.txt
> @@ -15,6 +15,10 @@ Optional properties:
>  - interrupt-parent: Specifies the phandle of the interrupt controller to which
>    the interrupts from s2mps11 are delivered to.
>  - interrupts: Interrupt specifiers for interrupt sources.
> +- samsung,s2mps11-acokb-ground: Indicates that ACOKB pin of S2MPS11 PMIC is
> +  connected to the ground so the PMIC must manually set PWRHOLD bit in CTRL1
> +  register to turn off the power. Usually the ACOKB is pulled up to VBATT so
> +  when PWRHOLD pin goes low, the rising ACOKB will trigger power off.
>
>  Optional nodes:
>  - clocks: s2mps11, s2mps13 and s5m8767 provide three(AP/CP/BT) buffered 32.768
> diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
> index d206a3e8fe87..a56ab2102a32 100644
> --- a/drivers/mfd/sec-core.c
> +++ b/drivers/mfd/sec-core.c
> @@ -278,6 +278,8 @@ static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
>          * not parsed here.
>          */
>
> +       pd->manual_poweroff = of_property_read_bool(dev->of_node,
> +                                               "samsung,s2mps11-acokb-ground");
>         return pd;
>  }
>  #else
> @@ -440,6 +442,34 @@ static int sec_pmic_remove(struct i2c_client *i2c)
>         return 0;
>  }
>
> +static void sec_pmic_shutdown(struct i2c_client *i2c)
> +{
> +       struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
> +       unsigned int reg, mask;
> +
> +       if (!sec_pmic->pdata->manual_poweroff)
> +               return;
> +
> +       switch (sec_pmic->device_type) {
> +       case S2MPS11X:
> +               reg = S2MPS11_REG_CTRL1;
> +               mask = S2MPS11_CTRL1_PWRHOLD_MASK;
> +               break;
> +       default:
> +               /*
> +                * Currently only one board with S2MPS11 needs this, so just
> +                * ignore the rest.
> +                */
> +               dev_warn(sec_pmic->dev,
> +                       "Unsupported device %lu for manual power off\n",
> +                       sec_pmic->device_type);
> +               return;
> +       }
> +
> +       regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
> +}
> +
> +
>  #ifdef CONFIG_PM_SLEEP
>  static int sec_pmic_suspend(struct device *dev)
>  {
> @@ -491,6 +521,7 @@ static struct i2c_driver sec_pmic_driver = {
>         },
>         .probe = sec_pmic_probe,
>         .remove = sec_pmic_remove,
> +       .shutdown = sec_pmic_shutdown,
>         .id_table = sec_pmic_id,
>  };
>
> diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
> index 75115384f3fc..aa78957e092f 100644
> --- a/include/linux/mfd/samsung/core.h
> +++ b/include/linux/mfd/samsung/core.h
> @@ -132,6 +132,8 @@ struct sec_platform_data {
>         int                             buck2_init;
>         int                             buck3_init;
>         int                             buck4_init;
> +       /* Whether or not manually set PWRHOLD to low during shutdown. */
> +       bool                            manual_poweroff;
>  };
>
>  /**
> diff --git a/include/linux/mfd/samsung/s2mps11.h b/include/linux/mfd/samsung/s2mps11.h
> index 7981a9d77d3f..b288965e8101 100644
> --- a/include/linux/mfd/samsung/s2mps11.h
> +++ b/include/linux/mfd/samsung/s2mps11.h
> @@ -179,6 +179,7 @@ enum s2mps11_regulators {
>  #define S2MPS11_BUCK_N_VOLTAGES (S2MPS11_BUCK_VSEL_MASK + 1)
>  #define S2MPS11_RAMP_DELAY     25000           /* uV/us */
>
> +#define S2MPS11_CTRL1_PWRHOLD_MASK     BIT(4)
>
>  #define S2MPS11_BUCK2_RAMP_SHIFT       6
>  #define S2MPS11_BUCK34_RAMP_SHIFT      4
> --
> 2.1.4
>
Thanks. Tested on Odroid-XU3 board.

Tested-by: Anand Moon <linux.amoon@gmail.com>
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Javier Martinez Canillas Aug. 5, 2015, 10:53 a.m. UTC | #2
Hello Krzysztof,

On 08/03/2015 02:37 PM, Krzysztof Kozlowski wrote:
> On Odroid XU3 board (with S2MPS11 PMIC) the PWRHOLD bit in CTRL1
> register must be manually set to 0 before initiating power off sequence.
> 
> One of usual power down methods for Exynos based devices looks like:
> 1. PWRHOLD pin of PMIC is connected to PSHOLD of Exynos.
> 2. Exynos holds up this pin during system operation.
> 3. ACOKB pin of PMIC is pulled up to VBATT and optionally to pin in
>    other device.
> 4. When PWRHOLD/PSHOLD goes low, the PMIC will turn off the power if
>    ACOKB goes high.
> 
> On Odroid XU3 family the difference is in (3) - the ACOKB is grounded.
> This means that PMIC must manually set PWRHOLD field to low and then
> wait for signal from Application Processor (the usual change in
> PWRHOLD/PSHOLD pin will actually cut off the power).
>

Is nice to finally have an explanation about why this is needed.
 
> The patch adds respective binding allowing Odroid XU3 device to be
> powered off.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
> Reported-by: Anand Moon <linux.amoon@gmail.com>
> 
> ---
> 
> Patch is losely based on patch in Hardkernel repository [0] and previous
> work of Anand Moon [1].
> 
> [0] https://github.com/hardkernel/linux/commit/6897e62ba328bd1c8c095d918101863250cd73e7
> [1] http://www.spinics.net/lists/linux-samsung-soc/msg45959.html
> ---
>  Documentation/devicetree/bindings/mfd/s2mps11.txt |  4 +++
>  drivers/mfd/sec-core.c                            | 31 +++++++++++++++++++++++
>  include/linux/mfd/samsung/core.h                  |  2 ++
>  include/linux/mfd/samsung/s2mps11.h               |  1 +
>  4 files changed, 38 insertions(+)
>

The patch looks good to me.

Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>

Best regards,
Lee Jones Aug. 10, 2015, 3:49 p.m. UTC | #3
On Mon, 03 Aug 2015, Krzysztof Kozlowski wrote:

> On Odroid XU3 board (with S2MPS11 PMIC) the PWRHOLD bit in CTRL1
> register must be manually set to 0 before initiating power off sequence.
> 
> One of usual power down methods for Exynos based devices looks like:
> 1. PWRHOLD pin of PMIC is connected to PSHOLD of Exynos.
> 2. Exynos holds up this pin during system operation.
> 3. ACOKB pin of PMIC is pulled up to VBATT and optionally to pin in
>    other device.
> 4. When PWRHOLD/PSHOLD goes low, the PMIC will turn off the power if
>    ACOKB goes high.
> 
> On Odroid XU3 family the difference is in (3) - the ACOKB is grounded.
> This means that PMIC must manually set PWRHOLD field to low and then
> wait for signal from Application Processor (the usual change in
> PWRHOLD/PSHOLD pin will actually cut off the power).
> 
> The patch adds respective binding allowing Odroid XU3 device to be
> powered off.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
> Reported-by: Anand Moon <linux.amoon@gmail.com>
> 
> ---
> 
> Patch is losely based on patch in Hardkernel repository [0] and previous
> work of Anand Moon [1].
> 
> [0] https://github.com/hardkernel/linux/commit/6897e62ba328bd1c8c095d918101863250cd73e7
> [1] http://www.spinics.net/lists/linux-samsung-soc/msg45959.html
> ---
>  Documentation/devicetree/bindings/mfd/s2mps11.txt |  4 +++
>  drivers/mfd/sec-core.c                            | 31 +++++++++++++++++++++++
>  include/linux/mfd/samsung/core.h                  |  2 ++
>  include/linux/mfd/samsung/s2mps11.h               |  1 +
>  4 files changed, 38 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/s2mps11.txt b/Documentation/devicetree/bindings/mfd/s2mps11.txt
> index 57a045016fca..90eaef393325 100644
> --- a/Documentation/devicetree/bindings/mfd/s2mps11.txt
> +++ b/Documentation/devicetree/bindings/mfd/s2mps11.txt
> @@ -15,6 +15,10 @@ Optional properties:
>  - interrupt-parent: Specifies the phandle of the interrupt controller to which
>    the interrupts from s2mps11 are delivered to.
>  - interrupts: Interrupt specifiers for interrupt sources.

> +- samsung,s2mps11-acokb-ground: Indicates that ACOKB pin of S2MPS11 PMIC is
> +  connected to the ground so the PMIC must manually set PWRHOLD bit in CTRL1
> +  register to turn off the power. Usually the ACOKB is pulled up to VBATT so
> +  when PWRHOLD pin goes low, the rising ACOKB will trigger power off.

Binding looks fine.  Please seperate it into a different patch and
apply my Ack:

Acked-by: Lee Jones <lee.jones@linaro.org>

>  Optional nodes:
>  - clocks: s2mps11, s2mps13 and s5m8767 provide three(AP/CP/BT) buffered 32.768
> diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
> index d206a3e8fe87..a56ab2102a32 100644
> --- a/drivers/mfd/sec-core.c
> +++ b/drivers/mfd/sec-core.c
> @@ -278,6 +278,8 @@ static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
>  	 * not parsed here.
>  	 */
>  
> +	pd->manual_poweroff = of_property_read_bool(dev->of_node,
> +						"samsung,s2mps11-acokb-ground");
>  	return pd;
>  }
>  #else
> @@ -440,6 +442,34 @@ static int sec_pmic_remove(struct i2c_client *i2c)
>  	return 0;
>  }
>  
> +static void sec_pmic_shutdown(struct i2c_client *i2c)
> +{
> +	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
> +	unsigned int reg, mask;
> +
> +	if (!sec_pmic->pdata->manual_poweroff)
> +		return;
> +
> +	switch (sec_pmic->device_type) {
> +	case S2MPS11X:
> +		reg = S2MPS11_REG_CTRL1;
> +		mask = S2MPS11_CTRL1_PWRHOLD_MASK;
> +		break;
> +	default:
> +		/*
> +		 * Currently only one board with S2MPS11 needs this, so just
> +		 * ignore the rest.
> +		 */
> +		dev_warn(sec_pmic->dev,
> +			"Unsupported device %lu for manual power off\n",
> +			sec_pmic->device_type);
> +		return;
> +	}
> +
> +	regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
> +}
> +
> +

Remove the extra '\n'.

When you resubmit, apply my Ack:

Acked-by: Lee Jones <lee.jones@linaro.org>

>  #ifdef CONFIG_PM_SLEEP
>  static int sec_pmic_suspend(struct device *dev)
>  {
> @@ -491,6 +521,7 @@ static struct i2c_driver sec_pmic_driver = {
>  	},
>  	.probe = sec_pmic_probe,
>  	.remove = sec_pmic_remove,
> +	.shutdown = sec_pmic_shutdown,
>  	.id_table = sec_pmic_id,
>  };
>  
> diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
> index 75115384f3fc..aa78957e092f 100644
> --- a/include/linux/mfd/samsung/core.h
> +++ b/include/linux/mfd/samsung/core.h
> @@ -132,6 +132,8 @@ struct sec_platform_data {
>  	int				buck2_init;
>  	int				buck3_init;
>  	int				buck4_init;
> +	/* Whether or not manually set PWRHOLD to low during shutdown. */
> +	bool				manual_poweroff;
>  };
>  
>  /**
> diff --git a/include/linux/mfd/samsung/s2mps11.h b/include/linux/mfd/samsung/s2mps11.h
> index 7981a9d77d3f..b288965e8101 100644
> --- a/include/linux/mfd/samsung/s2mps11.h
> +++ b/include/linux/mfd/samsung/s2mps11.h
> @@ -179,6 +179,7 @@ enum s2mps11_regulators {
>  #define S2MPS11_BUCK_N_VOLTAGES (S2MPS11_BUCK_VSEL_MASK + 1)
>  #define S2MPS11_RAMP_DELAY	25000		/* uV/us */
>  
> +#define S2MPS11_CTRL1_PWRHOLD_MASK	BIT(4)
>  
>  #define S2MPS11_BUCK2_RAMP_SHIFT	6
>  #define S2MPS11_BUCK34_RAMP_SHIFT	4
Krzysztof Kozlowski Aug. 10, 2015, 11:45 p.m. UTC | #4
On 11.08.2015 00:49, Lee Jones wrote:
> On Mon, 03 Aug 2015, Krzysztof Kozlowski wrote:
> 
>> On Odroid XU3 board (with S2MPS11 PMIC) the PWRHOLD bit in CTRL1
>> register must be manually set to 0 before initiating power off sequence.
>>
>> One of usual power down methods for Exynos based devices looks like:
>> 1. PWRHOLD pin of PMIC is connected to PSHOLD of Exynos.
>> 2. Exynos holds up this pin during system operation.
>> 3. ACOKB pin of PMIC is pulled up to VBATT and optionally to pin in
>>    other device.
>> 4. When PWRHOLD/PSHOLD goes low, the PMIC will turn off the power if
>>    ACOKB goes high.
>>
>> On Odroid XU3 family the difference is in (3) - the ACOKB is grounded.
>> This means that PMIC must manually set PWRHOLD field to low and then
>> wait for signal from Application Processor (the usual change in
>> PWRHOLD/PSHOLD pin will actually cut off the power).
>>
>> The patch adds respective binding allowing Odroid XU3 device to be
>> powered off.
>>
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
>> Reported-by: Anand Moon <linux.amoon@gmail.com>
>>
>> ---
>>
>> Patch is losely based on patch in Hardkernel repository [0] and previous
>> work of Anand Moon [1].
>>
>> [0] https://github.com/hardkernel/linux/commit/6897e62ba328bd1c8c095d918101863250cd73e7
>> [1] http://www.spinics.net/lists/linux-samsung-soc/msg45959.html
>> ---
>>  Documentation/devicetree/bindings/mfd/s2mps11.txt |  4 +++
>>  drivers/mfd/sec-core.c                            | 31 +++++++++++++++++++++++
>>  include/linux/mfd/samsung/core.h                  |  2 ++
>>  include/linux/mfd/samsung/s2mps11.h               |  1 +
>>  4 files changed, 38 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/mfd/s2mps11.txt b/Documentation/devicetree/bindings/mfd/s2mps11.txt
>> index 57a045016fca..90eaef393325 100644
>> --- a/Documentation/devicetree/bindings/mfd/s2mps11.txt
>> +++ b/Documentation/devicetree/bindings/mfd/s2mps11.txt
>> @@ -15,6 +15,10 @@ Optional properties:
>>  - interrupt-parent: Specifies the phandle of the interrupt controller to which
>>    the interrupts from s2mps11 are delivered to.
>>  - interrupts: Interrupt specifiers for interrupt sources.
> 
>> +- samsung,s2mps11-acokb-ground: Indicates that ACOKB pin of S2MPS11 PMIC is
>> +  connected to the ground so the PMIC must manually set PWRHOLD bit in CTRL1
>> +  register to turn off the power. Usually the ACOKB is pulled up to VBATT so
>> +  when PWRHOLD pin goes low, the rising ACOKB will trigger power off.
> 
> Binding looks fine.  Please seperate it into a different patch and
> apply my Ack:
> 
> Acked-by: Lee Jones <lee.jones@linaro.org>

OK

> 
>>  Optional nodes:
>>  - clocks: s2mps11, s2mps13 and s5m8767 provide three(AP/CP/BT) buffered 32.768
>> diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
>> index d206a3e8fe87..a56ab2102a32 100644
>> --- a/drivers/mfd/sec-core.c
>> +++ b/drivers/mfd/sec-core.c
>> @@ -278,6 +278,8 @@ static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
>>  	 * not parsed here.
>>  	 */
>>  
>> +	pd->manual_poweroff = of_property_read_bool(dev->of_node,
>> +						"samsung,s2mps11-acokb-ground");
>>  	return pd;
>>  }
>>  #else
>> @@ -440,6 +442,34 @@ static int sec_pmic_remove(struct i2c_client *i2c)
>>  	return 0;
>>  }
>>  
>> +static void sec_pmic_shutdown(struct i2c_client *i2c)
>> +{
>> +	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
>> +	unsigned int reg, mask;
>> +
>> +	if (!sec_pmic->pdata->manual_poweroff)
>> +		return;
>> +
>> +	switch (sec_pmic->device_type) {
>> +	case S2MPS11X:
>> +		reg = S2MPS11_REG_CTRL1;
>> +		mask = S2MPS11_CTRL1_PWRHOLD_MASK;
>> +		break;
>> +	default:
>> +		/*
>> +		 * Currently only one board with S2MPS11 needs this, so just
>> +		 * ignore the rest.
>> +		 */
>> +		dev_warn(sec_pmic->dev,
>> +			"Unsupported device %lu for manual power off\n",
>> +			sec_pmic->device_type);
>> +		return;
>> +	}
>> +
>> +	regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
>> +}
>> +
>> +
> 
> Remove the extra '\n'.
> 
> When you resubmit, apply my Ack:
> 
> Acked-by: Lee Jones <lee.jones@linaro.org>

Sure, I'll resend. The patch may go through your tree because there are
no external dependencies.

Best regards,
Krzysztof

> 
>>  #ifdef CONFIG_PM_SLEEP
>>  static int sec_pmic_suspend(struct device *dev)
>>  {
>> @@ -491,6 +521,7 @@ static struct i2c_driver sec_pmic_driver = {
>>  	},
>>  	.probe = sec_pmic_probe,
>>  	.remove = sec_pmic_remove,
>> +	.shutdown = sec_pmic_shutdown,
>>  	.id_table = sec_pmic_id,
>>  };
>>  
>> diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
>> index 75115384f3fc..aa78957e092f 100644
>> --- a/include/linux/mfd/samsung/core.h
>> +++ b/include/linux/mfd/samsung/core.h
>> @@ -132,6 +132,8 @@ struct sec_platform_data {
>>  	int				buck2_init;
>>  	int				buck3_init;
>>  	int				buck4_init;
>> +	/* Whether or not manually set PWRHOLD to low during shutdown. */
>> +	bool				manual_poweroff;
>>  };
>>  
>>  /**
>> diff --git a/include/linux/mfd/samsung/s2mps11.h b/include/linux/mfd/samsung/s2mps11.h
>> index 7981a9d77d3f..b288965e8101 100644
>> --- a/include/linux/mfd/samsung/s2mps11.h
>> +++ b/include/linux/mfd/samsung/s2mps11.h
>> @@ -179,6 +179,7 @@ enum s2mps11_regulators {
>>  #define S2MPS11_BUCK_N_VOLTAGES (S2MPS11_BUCK_VSEL_MASK + 1)
>>  #define S2MPS11_RAMP_DELAY	25000		/* uV/us */
>>  
>> +#define S2MPS11_CTRL1_PWRHOLD_MASK	BIT(4)
>>  
>>  #define S2MPS11_BUCK2_RAMP_SHIFT	6
>>  #define S2MPS11_BUCK34_RAMP_SHIFT	4
> 

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/mfd/s2mps11.txt b/Documentation/devicetree/bindings/mfd/s2mps11.txt
index 57a045016fca..90eaef393325 100644
--- a/Documentation/devicetree/bindings/mfd/s2mps11.txt
+++ b/Documentation/devicetree/bindings/mfd/s2mps11.txt
@@ -15,6 +15,10 @@  Optional properties:
 - interrupt-parent: Specifies the phandle of the interrupt controller to which
   the interrupts from s2mps11 are delivered to.
 - interrupts: Interrupt specifiers for interrupt sources.
+- samsung,s2mps11-acokb-ground: Indicates that ACOKB pin of S2MPS11 PMIC is
+  connected to the ground so the PMIC must manually set PWRHOLD bit in CTRL1
+  register to turn off the power. Usually the ACOKB is pulled up to VBATT so
+  when PWRHOLD pin goes low, the rising ACOKB will trigger power off.
 
 Optional nodes:
 - clocks: s2mps11, s2mps13 and s5m8767 provide three(AP/CP/BT) buffered 32.768
diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
index d206a3e8fe87..a56ab2102a32 100644
--- a/drivers/mfd/sec-core.c
+++ b/drivers/mfd/sec-core.c
@@ -278,6 +278,8 @@  static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 	 * not parsed here.
 	 */
 
+	pd->manual_poweroff = of_property_read_bool(dev->of_node,
+						"samsung,s2mps11-acokb-ground");
 	return pd;
 }
 #else
@@ -440,6 +442,34 @@  static int sec_pmic_remove(struct i2c_client *i2c)
 	return 0;
 }
 
+static void sec_pmic_shutdown(struct i2c_client *i2c)
+{
+	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
+	unsigned int reg, mask;
+
+	if (!sec_pmic->pdata->manual_poweroff)
+		return;
+
+	switch (sec_pmic->device_type) {
+	case S2MPS11X:
+		reg = S2MPS11_REG_CTRL1;
+		mask = S2MPS11_CTRL1_PWRHOLD_MASK;
+		break;
+	default:
+		/*
+		 * Currently only one board with S2MPS11 needs this, so just
+		 * ignore the rest.
+		 */
+		dev_warn(sec_pmic->dev,
+			"Unsupported device %lu for manual power off\n",
+			sec_pmic->device_type);
+		return;
+	}
+
+	regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
+}
+
+
 #ifdef CONFIG_PM_SLEEP
 static int sec_pmic_suspend(struct device *dev)
 {
@@ -491,6 +521,7 @@  static struct i2c_driver sec_pmic_driver = {
 	},
 	.probe = sec_pmic_probe,
 	.remove = sec_pmic_remove,
+	.shutdown = sec_pmic_shutdown,
 	.id_table = sec_pmic_id,
 };
 
diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
index 75115384f3fc..aa78957e092f 100644
--- a/include/linux/mfd/samsung/core.h
+++ b/include/linux/mfd/samsung/core.h
@@ -132,6 +132,8 @@  struct sec_platform_data {
 	int				buck2_init;
 	int				buck3_init;
 	int				buck4_init;
+	/* Whether or not manually set PWRHOLD to low during shutdown. */
+	bool				manual_poweroff;
 };
 
 /**
diff --git a/include/linux/mfd/samsung/s2mps11.h b/include/linux/mfd/samsung/s2mps11.h
index 7981a9d77d3f..b288965e8101 100644
--- a/include/linux/mfd/samsung/s2mps11.h
+++ b/include/linux/mfd/samsung/s2mps11.h
@@ -179,6 +179,7 @@  enum s2mps11_regulators {
 #define S2MPS11_BUCK_N_VOLTAGES (S2MPS11_BUCK_VSEL_MASK + 1)
 #define S2MPS11_RAMP_DELAY	25000		/* uV/us */
 
+#define S2MPS11_CTRL1_PWRHOLD_MASK	BIT(4)
 
 #define S2MPS11_BUCK2_RAMP_SHIFT	6
 #define S2MPS11_BUCK34_RAMP_SHIFT	4