linux-kernel - [PATCH v3 3/4] mfd: max77620: Add low battery monitor support

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Date:   Tue, 12 Feb 2019 14:43:52 +0800
From:   Mark Zhang <markz@...dia.com>
To:     <lee.jones@...aro.org>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <linux-tegra@...r.kernel.org>, Mark Zhang <markz@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Venkat Reddy Talla <vreddytalla@...dia.com>
Subject: [PATCH v3 3/4] mfd: max77620: Add low battery monitor support

This patch adds PMIC configurations for low-battery
monitoring by handling max77620 register CNFGGLBL1.

Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
Signed-off-by: Venkat Reddy Talla <vreddytalla@...dia.com>
Signed-off-by: Mark Zhang <markz@...dia.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