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mfd: arizona: Hold device in reset while ramping supplies 

Acquire the /RESET GPIO before we enable regulators and hold the device
in reset while the regulators power up in order to improve robustness
during the initial power up.

Also fix the error path so that the device is left in reset while we're
at it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
hifive-unleashed-5.1
Mark Brown 2013-03-26 12:15:26 +00:00 committed by Samuel Ortiz
parent 9bf7e0e83f
commit 87d3af4ac0
1 changed files with 13 additions and 13 deletions
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26
drivers/mfd/arizona-core.c
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@ -504,6 +504,17 @@ int arizona_dev_init(struct arizona *arizona)
goto err_early;
}
if (arizona->pdata.reset) {
/* Start out with /RESET low to put the chip into reset */
ret = gpio_request_one(arizona->pdata.reset,
GPIOF_DIR_OUT | GPIOF_INIT_LOW,
"arizona /RESET");
if (ret != 0) {
dev_err(dev, "Failed to request /RESET: %d\n", ret);
goto err_early;
}
}
ret = regulator_bulk_enable(arizona->num_core_supplies,
arizona->core_supplies);
if (ret != 0) {
@ -518,18 +529,8 @@ int arizona_dev_init(struct arizona *arizona)
goto err_enable;
}
if (arizona->pdata.reset) {
/* Start out with /RESET low to put the chip into reset */
ret = gpio_request_one(arizona->pdata.reset,
GPIOF_DIR_OUT | GPIOF_INIT_LOW,
"arizona /RESET");
if (ret != 0) {
dev_err(dev, "Failed to request /RESET: %d\n", ret);
goto err_dcvdd;
}
if (arizona->pdata.reset)
gpio_set_value_cansleep(arizona->pdata.reset, 1);
}
regcache_cache_only(arizona->regmap, false);
@ -769,10 +770,9 @@ err_irq:
arizona_irq_exit(arizona);
err_reset:
if (arizona->pdata.reset) {
gpio_set_value_cansleep(arizona->pdata.reset, 1);
gpio_set_value_cansleep(arizona->pdata.reset, 0);
gpio_free(arizona->pdata.reset);
}
err_dcvdd:
regulator_disable(arizona->dcvdd);
err_enable:
regulator_bulk_disable(arizona->num_core_supplies,