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rtc: isl12022: add support for trip level DT binding

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Implement support for using the values given in the
isil,battery-trip-levels-microvolt property to set appropriate values
in the VB85TP/VB75TP bits in the PWR_VBAT register.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20230615105826.411953-5-linux@rasmusvillemoes.dk
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Rasmus Villemoes
2023-06-15 12:58:22 +02:00
committed by Alexandre Belloni
parent 69b569c124
commit 2caeb566ba
1 changed files with 39 additions and 0 deletions
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39
drivers/rtc/rtc-isl12022.c
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@@ -9,6 +9,7 @@
*/
#include <linux/bcd.h>
#include <linux/bitfield.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/i2c.h>
@@ -31,6 +32,8 @@
#define ISL12022_REG_SR 0x07
#define ISL12022_REG_INT 0x08
#define ISL12022_REG_PWR_VBAT 0x0a
#define ISL12022_REG_BETA 0x0d
#define ISL12022_REG_TEMP_L 0x28
@@ -42,6 +45,9 @@
#define ISL12022_INT_WRTC (1 << 6)
#define ISL12022_REG_VB85_MASK GENMASK(5, 3)
#define ISL12022_REG_VB75_MASK GENMASK(2, 0)
#define ISL12022_BETA_TSE (1 << 7)
static umode_t isl12022_hwmon_is_visible(const void *data,
@@ -209,6 +215,38 @@ static const struct regmap_config regmap_config = {
.use_single_write = true,
};
static const u32 trip_levels[2][7] = {
{ 2125000, 2295000, 2550000, 2805000, 3060000, 4250000, 4675000 },
{ 1875000, 2025000, 2250000, 2475000, 2700000, 3750000, 4125000 },
};
static void isl12022_set_trip_levels(struct device *dev)
{
struct regmap *regmap = dev_get_drvdata(dev);
u32 levels[2] = {0, 0};
int ret, i, j, x[2];
u8 val, mask;
device_property_read_u32_array(dev, "isil,battery-trip-levels-microvolt",
levels, 2);
for (i = 0; i < 2; i++) {
for (j = 0; j < ARRAY_SIZE(trip_levels[i]) - 1; j++) {
if (levels[i] <= trip_levels[i][j])
break;
}
x[i] = j;
}
val = FIELD_PREP(ISL12022_REG_VB85_MASK, x[0]) |
FIELD_PREP(ISL12022_REG_VB75_MASK, x[1]);
mask = ISL12022_REG_VB85_MASK | ISL12022_REG_VB75_MASK;
ret = regmap_update_bits(regmap, ISL12022_REG_PWR_VBAT, mask, val);
if (ret)
dev_warn(dev, "unable to set battery alarm levels: %d\n", ret);
}
static int isl12022_probe(struct i2c_client *client)
{
struct rtc_device *rtc;
@@ -225,6 +263,7 @@ static int isl12022_probe(struct i2c_client *client)
dev_set_drvdata(&client->dev, regmap);
isl12022_set_trip_levels(&client->dev);
isl12022_hwmon_register(&client->dev);
rtc = devm_rtc_allocate_device(&client->dev);