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drivers: mfd: axp192: add possibility to disable N_VBUSEN functionality

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By default N_VBUSEN signal is used by the host to define if VBUS
signal should be used for power supply (VBUS-IPSOUT).

This feature enables the possbibility to change this behaviour.
When N_VBUSEN detection is disabled, axp192 will automatically
decide to use VBUS (REG10H[7] = 1).
Please refer to datasheet for details.

Signed-off-by: Martin Kiepfer <mrmarteng@teleschirm.org>
This commit is contained in:
Martin Kiepfer 2024-01-07 16:40:35 +01:00 committed by Fabio Baltieri
parent 2a83c58023
commit 0addb90ff7
2 changed files with 30 additions and 1 deletions
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22
drivers/mfd/mfd_axp192.c
View file

@ -22,6 +22,7 @@ LOG_MODULE_REGISTER(mfd_axp192, CONFIG_MFD_LOG_LEVEL);
#define AXP192_REG_CHIP_ID 0x03U
/* AXP192 GPIO register addresses */
#define AXP192_EXTEN_DCDC2_CONTROL_REG 0x10U
#define AXP192_VBUS_CFG_REG 0x30U
#define AXP192_GPIO0_FUNC_REG 0x90U
#define AXP192_GPIO1_FUNC_REG 0x92U
@ -31,6 +32,9 @@ LOG_MODULE_REGISTER(mfd_axp192, CONFIG_MFD_LOG_LEVEL);
#define AXP192_GPIO34_PINVAL_REG 0x96U
#define AXP192_GPIO012_PULLDOWN_REG 0x97U
/* VBUS control reg values */
#define AXP192_VBUS_CFG_VAL_VBUSEN_DISABLE 0x80U
/* GPIO function control parameters */
#define AXP192_GPIO012_FUNC_VAL_OUTPUT_OD 0x00U
#define AXP192_GPIO012_FUNC_VAL_INPUT 0x01U
@ -84,6 +88,7 @@ LOG_MODULE_REGISTER(mfd_axp192, CONFIG_MFD_LOG_LEVEL);
#define AXP192_GPIO2_OUTPUT_VAL 0x04U
#define AXP192_GPIO012_OUTPUT_MASK \
(AXP192_GPIO0_OUTPUT_VAL | AXP192_GPIO1_OUTPUT_VAL | AXP192_GPIO2_OUTPUT_VAL)
#define AXP192_GPIO3_OUTPUT_VAL 0x01U
#define AXP192_GPIO4_OUTPUT_VAL 0x02U
#define AXP192_GPIO34_OUTPUT_MASK (AXP192_GPIO3_OUTPUT_VAL | AXP192_GPIO4_OUTPUT_VAL)
@ -91,8 +96,10 @@ LOG_MODULE_REGISTER(mfd_axp192, CONFIG_MFD_LOG_LEVEL);
#define AXP192_GPIO5_OUTPUT_MASK 0x04U
#define AXP192_GPIO5_OUTPUT_VAL 0x04U
#define AXP192_GPIO5_OUTPUT_SHIFT 3U
struct mfd_axp192_config {
struct i2c_dt_spec i2c;
bool vbusen_disable;
};
struct mfd_axp192_data {
@ -137,6 +144,7 @@ static int mfd_axp192_init(const struct device *dev)
{
const struct mfd_axp192_config *config = dev->config;
uint8_t chip_id;
uint8_t vbus_val;
int ret;
LOG_DBG("Initializing instance");
@ -156,6 +164,17 @@ static int mfd_axp192_init(const struct device *dev)
return -EINVAL;
}
/* Disable N_VBUSEN */
vbus_val = 0;
if (config->vbusen_disable) {
vbus_val = AXP192_VBUS_CFG_VAL_VBUSEN_DISABLE;
}
ret = i2c_reg_update_byte_dt(&config->i2c, AXP192_VBUS_CFG_REG,
AXP192_VBUS_CFG_VAL_VBUSEN_DISABLE, vbus_val);
if (ret < 0) {
return ret;
}
return 0;
}
@ -590,6 +609,7 @@ int mfd_axp192_gpio_write_port(const struct device *dev, uint8_t value, uint8_t
#define MFD_AXP192_DEFINE(inst) \
static const struct mfd_axp192_config config##inst = { \
.i2c = I2C_DT_SPEC_INST_GET(inst), \
.vbusen_disable = DT_INST_PROP_OR(inst, vbusen_disable, false), \
}; \
\
static struct mfd_axp192_data data##inst; \
@ -597,4 +617,4 @@ int mfd_axp192_gpio_write_port(const struct device *dev, uint8_t value, uint8_t
DEVICE_DT_INST_DEFINE(inst, mfd_axp192_init, NULL, &data##inst, &config##inst, \
POST_KERNEL, CONFIG_MFD_INIT_PRIORITY, NULL);
DT_INST_FOREACH_STATUS_OKAY(MFD_AXP192_DEFINE)
DT_INST_FOREACH_STATUS_OKAY(MFD_AXP192_DEFINE);

9
dts/bindings/mfd/x-powers,axp192.yaml
View file

@ -10,3 +10,12 @@ include: i2c-device.yaml
properties:
reg:
required: true
vbusen-disable:
type: boolean
description: |
This option will disable VBUS power control via N_VBUSEN.
By default VBUS power supply is chosen via N_VBUSEN pin.
When disabled, VBUS can by chosen automatically by the pmic
and there is no need by the host to control N_VBUSEN pin.
Please refer to datasheet for details (pin state (REG10H[7] = 1).