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Subject[PATCH v3 2/2] mfd: tps65218.c: Add input voltage options
Date
These options apply to all regulators in this chip.

ti,strict-supply-voltage-supervision:
Set STRICT flag in CONFIG1
ti,under-voltage-limit-microvolt:
Select 2.75, 2.95, 3.25 or 3.35 V UVLO in CONFIG1
ti,under-voltage-hyst-microvolt:
Select 200mV or 400mV UVLOHYS in CONFIG2

Signed-off-by: Christian Hohnstaedt <Christian.Hohnstaedt@wago.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Keerthy <j-keerthy@ti.com>
---
drivers/mfd/tps65218.c | 89 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/tps65218.h | 4 ++
2 files changed, 93 insertions(+)

diff --git a/drivers/mfd/tps65218.c b/drivers/mfd/tps65218.c
index 8bcdecf..a62ea4c 100644
--- a/drivers/mfd/tps65218.c
+++ b/drivers/mfd/tps65218.c
@@ -211,6 +211,83 @@ static const struct of_device_id of_tps65218_match_table[] = {
};
MODULE_DEVICE_TABLE(of, of_tps65218_match_table);

+static int tps65218_voltage_set_strict(struct tps65218 *tps)
+{
+ u32 strict;
+
+ if (of_property_read_u32(tps->dev->of_node,
+ "ti,strict-supply-voltage-supervision",
+ &strict))
+ return 0;
+
+ if (strict != 0 && strict != 1) {
+ dev_err(tps->dev,
+ "Invalid ti,strict-supply-voltage-supervision value\n");
+ return -EINVAL;
+ }
+
+ tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
+ TPS65218_CONFIG1_STRICT,
+ strict ? TPS65218_CONFIG1_STRICT : 0,
+ TPS65218_PROTECT_L1);
+ return 0;
+}
+
+static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps)
+{
+ u32 hyst;
+
+ if (of_property_read_u32(tps->dev->of_node,
+ "ti,under-voltage-hyst-microvolt", &hyst))
+ return 0;
+
+ if (hyst != 400000 && hyst != 200000) {
+ dev_err(tps->dev,
+ "Invalid ti,under-voltage-hyst-microvolt value\n");
+ return -EINVAL;
+ }
+
+ tps65218_update_bits(tps, TPS65218_REG_CONFIG2,
+ TPS65218_CONFIG2_UVLOHYS,
+ hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0,
+ TPS65218_PROTECT_L1);
+ return 0;
+}
+
+static int tps65218_voltage_set_uvlo(struct tps65218 *tps)
+{
+ u32 uvlo;
+ int uvloval;
+
+ if (of_property_read_u32(tps->dev->of_node,
+ "ti,under-voltage-limit-microvolt", &uvlo))
+ return 0;
+
+ switch (uvlo) {
+ case 2750000:
+ uvloval = TPS65218_CONFIG1_UVLO_2750000;
+ break;
+ case 2950000:
+ uvloval = TPS65218_CONFIG1_UVLO_2950000;
+ break;
+ case 3250000:
+ uvloval = TPS65218_CONFIG1_UVLO_3250000;
+ break;
+ case 3350000:
+ uvloval = TPS65218_CONFIG1_UVLO_3350000;
+ break;
+ default:
+ dev_err(tps->dev,
+ "Invalid ti,under-voltage-limit-microvolt value\n");
+ return -EINVAL;
+ }
+
+ tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
+ TPS65218_CONFIG1_UVLO_MASK, uvloval,
+ TPS65218_PROTECT_L1);
+ return 0;
+}
+
static int tps65218_probe(struct i2c_client *client,
const struct i2c_device_id *ids)
{
@@ -249,6 +326,18 @@ static int tps65218_probe(struct i2c_client *client,

tps->rev = chipid & TPS65218_CHIPID_REV_MASK;

+ ret = tps65218_voltage_set_strict(tps);
+ if (ret)
+ return ret;
+
+ ret = tps65218_voltage_set_uvlo(tps);
+ if (ret)
+ return ret;
+
+ ret = tps65218_voltage_set_uv_hyst(tps);
+ if (ret)
+ return ret;
+
ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
ARRAY_SIZE(tps65218_cells), NULL, 0,
regmap_irq_get_domain(tps->irq_data));
diff --git a/include/linux/mfd/tps65218.h b/include/linux/mfd/tps65218.h
index c204d9a..3cbe103 100644
--- a/include/linux/mfd/tps65218.h
+++ b/include/linux/mfd/tps65218.h
@@ -137,6 +137,10 @@
#define TPS65218_CONFIG1_PGDLY_MASK 0x18
#define TPS65218_CONFIG1_STRICT BIT(2)
#define TPS65218_CONFIG1_UVLO_MASK 0x3
+#define TPS65218_CONFIG1_UVLO_2750000 0x0
+#define TPS65218_CONFIG1_UVLO_2950000 0x1
+#define TPS65218_CONFIG1_UVLO_3250000 0x2
+#define TPS65218_CONFIG1_UVLO_3350000 0x3

#define TPS65218_CONFIG2_DC12_RST BIT(7)
#define TPS65218_CONFIG2_UVLOHYS BIT(6)
--
2.7.4
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