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drivers: i2c: cc13xx_cc26xx: reset pin type when entering low power mode

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It was observed that leaving the pin type configured for i2c for SDA
and SCL results in higher power consumption during standby. So we are
resetting the pin type when bringing the i2c into low power mode, and
setting it back to the correct type when exiting low power mode.

Signed-off-by: Vincent Wan <vincent.wan@linaro.org>
This commit is contained in:
Vincent Wan 2019-11-13 13:34:29 -08:00 • committed by Anas Nashif
commit c806947d87
1 changed files with 8 additions and 0 deletions
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8
drivers/i2c/i2c_cc13xx_cc26xx.c
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@ -332,6 +332,9 @@ static int i2c_cc13xx_cc26xx_set_power_state(struct device *dev,
if ((new_state == DEVICE_PM_ACTIVE_STATE) &&
(new_state != get_dev_data(dev)->pm_state)) {
Power_setDependency(PowerCC26XX_PERIPH_I2C0);
IOCPinTypeI2c(get_dev_config(dev)->base,
get_dev_config(dev)->sda_pin,
get_dev_config(dev)->scl_pin);
ret = i2c_cc13xx_cc26xx_configure(dev,
get_dev_data(dev)->dev_config);
if (ret == 0) {
@ -346,6 +349,11 @@ static int i2c_cc13xx_cc26xx_set_power_state(struct device *dev,
if (get_dev_data(dev)->pm_state == DEVICE_PM_ACTIVE_STATE) {
I2CMasterIntDisable(get_dev_config(dev)->base);
I2CMasterDisable(get_dev_config(dev)->base);
/* Reset pin type to default GPIO configuration */
IOCPortConfigureSet(get_dev_config(dev)->scl_pin,
IOC_PORT_GPIO, IOC_STD_OUTPUT);
IOCPortConfigureSet(get_dev_config(dev)->sda_pin,
IOC_PORT_GPIO, IOC_STD_OUTPUT);
Power_releaseDependency(PowerCC26XX_PERIPH_I2C0);
get_dev_data(dev)->pm_state = new_state;
}