Messages in this thread | | | Date | Tue, 13 Dec 2011 11:50:02 +0200 | From | Igor Grinberg <> | Subject | Re: [PATCH] MFD: TWL: add power off functionality |
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Samuel,
Can we get this one into 3.3?
Thanks
On 11/27/11 11:42, Igor Grinberg wrote: > ping! > > > On 11/13/11 11:49, Igor Grinberg wrote: >> TWL family of PMICs, used in master mode, have a power off >> functionality. The resulting power off sequence shuts down all the SoC >> supplies, LDOs, etc. The sequence is described in the datasheets >> chapter "Power-Off Sequence". >> Note, that board must be wired correctly for the power off to work as >> expected. >> >> Signed-off-by: Igor Grinberg <grinberg@compulab.co.il> >> --- >> drivers/mfd/twl4030-power.c | 42 ++++++++++++++++++++++++++++++++++++++++-- >> include/linux/i2c/twl.h | 2 ++ >> 2 files changed, 42 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c >> index a764676..d905f51 100644 >> --- a/drivers/mfd/twl4030-power.c >> +++ b/drivers/mfd/twl4030-power.c >> @@ -34,7 +34,8 @@ >> static u8 twl4030_start_script_address = 0x2b; >> >> #define PWR_P1_SW_EVENTS 0x10 >> -#define PWR_DEVOFF (1<<0) >> +#define PWR_DEVOFF (1 << 0) >> +#define SEQ_OFFSYNC (1 << 0) >> >> #define PHY_TO_OFF_PM_MASTER(p) (p - 0x36) >> #define PHY_TO_OFF_PM_RECEIVER(p) (p - 0x5b) >> @@ -511,12 +512,27 @@ int twl4030_remove_script(u8 flags) >> return err; >> } >> >> +/* >> + * In master mode, start the power off sequence. >> + * After a successful execution, TWL shuts down the power to the SoC >> + * and all peripherals connected to it. >> + */ >> +void twl4030_power_off(void) >> +{ >> + int err; >> + >> + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, PWR_DEVOFF, >> + TWL4030_PM_MASTER_P1_SW_EVENTS); >> + if (err) >> + pr_err("TWL4030 Unable to power off\n"); >> +} >> + >> void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts) >> { >> int err = 0; >> int i; >> struct twl4030_resconfig *resconfig; >> - u8 address = twl4030_start_script_address; >> + u8 val, address = twl4030_start_script_address; >> >> err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, >> TWL4030_PM_MASTER_KEY_CFG1, >> @@ -548,6 +564,28 @@ void __init twl4030_power_init(struct twl4030_power_data *twl4030_scripts) >> } >> } >> >> + /* Board has to be wired properly to use this feature */ >> + if (twl4030_scripts->use_poweroff && !pm_power_off) { >> + /* Default for SEQ_OFFSYNC is set, lets ensure this */ >> + err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &val, >> + TWL4030_PM_MASTER_CFG_P123_TRANSITION); >> + if (err) { >> + pr_warning("TWL4030 Unable to read registers\n"); >> + >> + } else if (!(val & SEQ_OFFSYNC)) { >> + val |= SEQ_OFFSYNC; >> + err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, val, >> + TWL4030_PM_MASTER_CFG_P123_TRANSITION); >> + if (err) { >> + pr_err("TWL4030 Unable to setup SEQ_OFFSYNC\n"); >> + goto relock; >> + } >> + } >> + >> + pm_power_off = twl4030_power_off; >> + } >> + >> +relock: >> err = twl_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, >> TWL4030_PM_MASTER_PROTECT_KEY); >> if (err) >> diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h >> index 114c0f6..78d3465 100644 >> --- a/include/linux/i2c/twl.h >> +++ b/include/linux/i2c/twl.h >> @@ -652,10 +652,12 @@ struct twl4030_power_data { >> unsigned num; >> struct twl4030_resconfig *resource_config; >> #define TWL4030_RESCONFIG_UNDEF ((u8)-1) >> + bool use_poweroff; /* Board is wired for TWL poweroff */ >> }; >> >> extern void twl4030_power_init(struct twl4030_power_data *triton2_scripts); >> extern int twl4030_remove_script(u8 flags); >> +extern void twl4030_power_off(void); >> >> struct twl4030_codec_data { >> unsigned int digimic_delay; /* in ms */ >
-- Regards, Igor.
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