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Subject[PATCH v3 3/4] mfd: max77620: Add low battery monitor support
Date
This patch adds PMIC configurations for low-battery
monitoring by handling max77620 register CNFGGLBL1.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Venkat Reddy Talla <vreddytalla@nvidia.com>
Signed-off-by: Mark Zhang <markz@nvidia.com>
---
drivers/mfd/max77620.c | 35 ++++++++++++++++++++++++++++++++++-
1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/max77620.c b/drivers/mfd/max77620.c
index 494d98357f65..6f0c85b2ca26 100644
--- a/drivers/mfd/max77620.c
+++ b/drivers/mfd/max77620.c
@@ -474,6 +474,35 @@ static int max77620_init_backup_battery_charging(struct max77620_chip *chip)
return ret;
}

+static int max77620_init_low_battery_monitor(struct max77620_chip *chip)
+{
+ struct device *dev = chip->dev;
+ bool bval;
+ int ival;
+ u8 mask = 0;
+ u8 val = 0;
+ int ret;
+
+ mask |= MAX77620_CNFGGLBL1_LBDAC_EN;
+ bval = of_property_read_bool(dev->of_node,
+ "maxim,low-battery-dac-enable");
+ if (bval)
+ val |= MAX77620_CNFGGLBL1_LBDAC_EN;
+
+ mask |= MAX77620_CNFGGLBL1_LBRSTEN | MAX77620_CNFGGLBL1_MPPLD;
+ ival = of_property_match_string(dev->of_node,
+ "maxim,low-battery-mode", "shutdown");
+ if (ival < 0)
+ val |= MAX77620_CNFGGLBL1_LBRSTEN;
+ else
+ val |= MAX77620_CNFGGLBL1_MPPLD;
+
+ ret = regmap_update_bits(chip->rmap, MAX77620_REG_CNFGGLBL1, mask, val);
+ if (ret < 0)
+ dev_err(dev, "Reg CNFGGLBL1 update failed: %d\n", ret);
+ return ret;
+}
+
static int max77620_read_es_version(struct max77620_chip *chip)
{
unsigned int val;
@@ -563,7 +592,11 @@ static int max77620_probe(struct i2c_client *client,
if (ret < 0)
return ret;

- ret = devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE,
+ ret = max77620_init_low_battery_monitor(chip);
+ if (ret < 0)
+ return ret;
+
+ ret = devm_mfd_add_devices(chip->dev, PLATFORM_DEVID_NONE,
mfd_cells, n_mfd_cells, NULL, 0,
regmap_irq_get_domain(chip->top_irq_data));
if (ret < 0) {
--
2.19.2
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