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SubjectRe: [PATCH] MFD: TWL: add power off functionality
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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