Re: [PATCH v7 5/6] regulator: pfuze100-regulator: provide pm_power_off_prepare handler

[Oleksij Rempel <o.rempel@pengutronix.de>]

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Hi Mark,

Rob ACKed DT bindings, Rafael ACKed export of pm_power_off_prepare. I
need your OK for regulator patch.

On 17.05.2018 07:50, Oleksij Rempel wrote:
> On some boards the SoC can use one pin "PMIC_STBY_REQ" to notify th PMIC
> about state changes. In this case internal state of PMIC must be
> preconfigured for upcomming state change.
> It works fine with the current regulator framework, except with the
> power-off case.
> 
> This patch is providing an optional pm_power_off_prepare handler
> which will configure standby state of the PMIC to disable all power lines.
> 
> In my power consumption test on RIoTBoard, I got the following results:
> power off without this patch:	320 mA
> power off with this patch:	2   mA
> suspend to ram:			40  mA
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  drivers/regulator/pfuze100-regulator.c | 92 ++++++++++++++++++++++++++
>  1 file changed, 92 insertions(+)
> 
> diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c
> index 63922a2167e5..f6c276ed91d8 100644
> --- a/drivers/regulator/pfuze100-regulator.c
> +++ b/drivers/regulator/pfuze100-regulator.c
> @@ -28,6 +28,7 @@
>  #include <linux/regulator/pfuze100.h>
>  #include <linux/i2c.h>
>  #include <linux/slab.h>
> +#include <linux/kallsyms.h>
>  #include <linux/regmap.h>
>  
>  #define PFUZE_NUMREGS		128
> @@ -42,11 +43,17 @@
>  
>  #define PFUZE100_COINVOL	0x1a
>  #define PFUZE100_SW1ABVOL	0x20
> +#define PFUZE100_SW1ABMODE	0x23
>  #define PFUZE100_SW1CVOL	0x2e
> +#define PFUZE100_SW1CMODE	0x31
>  #define PFUZE100_SW2VOL		0x35
> +#define PFUZE100_SW2MODE	0x38
>  #define PFUZE100_SW3AVOL	0x3c
> +#define PFUZE100_SW3AMODE	0x3f
>  #define PFUZE100_SW3BVOL	0x43
> +#define PFUZE100_SW3BMODE	0x46
>  #define PFUZE100_SW4VOL		0x4a
> +#define PFUZE100_SW4MODE	0x4d
>  #define PFUZE100_SWBSTCON1	0x66
>  #define PFUZE100_VREFDDRCON	0x6a
>  #define PFUZE100_VSNVSVOL	0x6b
> @@ -57,6 +64,13 @@
>  #define PFUZE100_VGEN5VOL	0x70
>  #define PFUZE100_VGEN6VOL	0x71
>  
> +#define PFUZE100_SWxMODE_MASK	0xf
> +#define PFUZE100_SWxMODE_APS_APS	0x8
> +#define PFUZE100_SWxMODE_APS_OFF	0x4
> +
> +#define PFUZE100_VGENxLPWR	BIT(6)
> +#define PFUZE100_VGENxSTBY	BIT(5)
> +
>  enum chips { PFUZE100, PFUZE200, PFUZE3000 = 3 };
>  
>  struct pfuze_regulator {
> @@ -489,6 +503,69 @@ static inline struct device_node *match_of_node(int index)
>  }
>  #endif
>  
> +static struct pfuze_chip *syspm_pfuze_chip;
> +
> +static void pfuze_power_off_prepare(void)
> +{
> +	dev_info(syspm_pfuze_chip->dev, "Configure standy mode for power off");
> +
> +	/* Switch from default mode: APS/APS to APS/Off */
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW1ABMODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW1CMODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW2MODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW3AMODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW3BMODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_SW4MODE,
> +			   PFUZE100_SWxMODE_MASK, PFUZE100_SWxMODE_APS_OFF);
> +
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN1VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN2VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN3VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN4VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN5VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +	regmap_update_bits(syspm_pfuze_chip->regmap, PFUZE100_VGEN6VOL,
> +			   PFUZE100_VGENxLPWR | PFUZE100_VGENxSTBY,
> +			   PFUZE100_VGENxSTBY);
> +}
> +
> +static int pfuze_power_off_prepare_init(struct pfuze_chip *pfuze_chip)
> +{
> +	if (pfuze_chip->chip_id != PFUZE100) {
> +		dev_warn(pfuze_chip->dev, "Requested pm_power_off_prepare handler for not supported chip\n");
> +		return -ENODEV;
> +	}
> +
> +	if (pm_power_off_prepare) {
> +		dev_warn(pfuze_chip->dev, "pm_power_off_prepare is already registered.\n");
> +		return -EBUSY;
> +	}
> +
> +	if (syspm_pfuze_chip) {
> +		dev_warn(pfuze_chip->dev, "syspm_pfuze_chip is already set.\n");
> +		return -EBUSY;
> +	}
> +
> +	syspm_pfuze_chip = pfuze_chip;
> +	pm_power_off_prepare = pfuze_power_off_prepare;
> +
> +	return 0;
> +}
> +
>  static int pfuze_identify(struct pfuze_chip *pfuze_chip)
>  {
>  	unsigned int value;
> @@ -659,6 +736,20 @@ static int pfuze100_regulator_probe(struct i2c_client *client,
>  		}
>  	}
>  
> +	if (of_property_read_bool(client->dev.of_node,
> +				  "fsl,pmic-stby-poweroff"))
> +		return pfuze_power_off_prepare_init(pfuze_chip);
> +
> +	return 0;
> +}
> +
> +static int pfuze100_regulator_remove(struct i2c_client *client)
> +{
> +	if (syspm_pfuze_chip) {
> +		syspm_pfuze_chip = NULL;
> +		pm_power_off_prepare = NULL;
> +	}
> +
>  	return 0;
>  }
>  
> @@ -669,6 +760,7 @@ static struct i2c_driver pfuze_driver = {
>  		.of_match_table = pfuze_dt_ids,
>  	},
>  	.probe = pfuze100_regulator_probe,
> +	.remove = pfuze100_regulator_remove,
>  };
>  module_i2c_driver(pfuze_driver);
>  
> 


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