Re: [PATCH v8 5/6] regulator: pfuze100-regulator: provide pm_power_off_prepare handler

From: Oleksij Rempel
Date: Thu Aug 02 2018 - 12:02:41 EST



On 27.07.2018 11:32, Robin Gong wrote:
>
>
>> -----Original Message-----
>> From: Oleksij Rempel [mailto:o.rempel@xxxxxxxxxxxxxx]
>> Sent: 2018年7月26日 17:22
>> To: Shawn Guo <shawnguo@xxxxxxxxxx>; Mark Brown <broonie@xxxxxxxxxx>;
>> Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>> Cc: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>; kernel@xxxxxxxxxxxxxx;
>> devicetree@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
>> linux-clk@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Andrew Morton
>> <akpm@xxxxxxxxxxxxxxxxxxxx>; Liam Girdwood <lgirdwood@xxxxxxxxx>;
>> Leonard Crestez <leonard.crestez@xxxxxxx>; Rob Herring
>> <robh+dt@xxxxxxxxxx>; Mark Rutland <mark.rutland@xxxxxxx>; Michael
>> Turquette <mturquette@xxxxxxxxxxxx>; Stephen Boyd
>> <sboyd@xxxxxxxxxxxxxx>; Fabio Estevam <fabio.estevam@xxxxxxx>; Russell
>> King <linux@xxxxxxxxxxxxxxx>; dl-linux-imx <linux-imx@xxxxxxx>; Robin Gong
>> <yibin.gong@xxxxxxx>; A.s. Dong <aisheng.dong@xxxxxxx>
>> Subject: [PATCH v8 5/6] regulator: pfuze100-regulator: provide
>> pm_power_off_prepare handler
>>
>> 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@xxxxxxxxxxxxxx>
>> ---
>> 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 8d9dbcc775ea..e386e9acb3f7 100644
>> --- a/drivers/regulator/pfuze100-regulator.c
>> +++ b/drivers/regulator/pfuze100-regulator.c
>> @@ -15,6 +15,7 @@
>> #include <linux/regulator/pfuze100.h>
>> #include <linux/i2c.h>
>> #include <linux/slab.h>
>> +#include <linux/kallsyms.h>
> Is it necessary?
>> #include <linux/regmap.h>
>>
>> #define PFUZE_NUMREGS 128
>> @@ -29,11 +30,17 @@
>>
>> #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
>> @@ -44,6 +51,13 @@
>> #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 {
>> @@ -492,6 +506,69 @@ 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");
> Add 'if (syspm_pfuze_chip ->chip_id == PFUZE100))' here is easy for extend
> Support on pfuze200/3000.. in the feature.
There is already:
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;
}


No need to add it in pfuze_power_off_prepare()

>> +
>> + /* 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;
>> @@ -661,6 +738,20 @@ 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;
>> }
>>
>> @@ -671,6 +762,7 @@ 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);
>>
>> --
>> 2.18.0
>

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