[PATCH v2 3/4] mfd: max77620: Add low battery monitor support

Mark Zhang
2019-01-29T08:56:26Z

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 | 57 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/max77620.c b/drivers/mfd/max77620.c
index f58143103185..9e50d145afd8 100644
--- a/drivers/mfd/max77620.c
+++ b/drivers/mfd/max77620.c
@@ -474,6 +474,57 @@ 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;
+ struct device_node *np;
+ bool pval;
+ u8 mask = 0;
+ u8 val = 0;
+ int ret;
+
+ np = of_get_child_by_name(dev->of_node, "low-battery-monitor");
+ if (!np) {
+ dev_info(dev, "Low battery monitoring support disabled\n");
+ return 0;
+ }
+
+ pval = of_property_read_bool(np, "maxim,low-battery-dac-enable");
+ if (pval) {
+ mask |= MAX77620_CNFGGLBL1_LBDAC_EN;
+ val |= MAX77620_CNFGGLBL1_LBDAC_EN;
+ }
+
+ pval = of_property_read_bool(np, "maxim,low-battery-dac-disable");
+ if (pval)
+ mask |= MAX77620_CNFGGLBL1_LBDAC_EN;
+
+ pval = of_property_read_bool(np, "maxim,low-battery-shutdown-enable");
+ if (pval) {
+ mask |= MAX77620_CNFGGLBL1_MPPLD;
+ val |= MAX77620_CNFGGLBL1_MPPLD;
+ }
+
+ pval = of_property_read_bool(np, "maxim,low-battery-shutdown-disable");
+ if (pval)
+ mask |= MAX77620_CNFGGLBL1_MPPLD;
+
+ pval = of_property_read_bool(np, "maxim,low-battery-reset-enable");
+ if (pval) {
+ mask |= MAX77620_CNFGGLBL1_LBRSTEN;
+ val |= MAX77620_CNFGGLBL1_LBRSTEN;
+ }
+
+ pval = of_property_read_bool(np, "maxim,low-battery-reset-disable");
+ if (pval)
+ mask |= MAX77620_CNFGGLBL1_LBRSTEN;
+
+ 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 +614,11 @@ 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