Messages in this thread | | | Date | Sun, 27 Nov 2011 11:42:17 +0200 | From | Igor Grinberg <> | Subject | Re: [PATCH] MFD: TWL: add power off functionality |
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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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