diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-isl12022.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-isl12022.c b/drivers/rtc/rtc-isl12022.c index a816c5447295..4eef7afcc8bc 100644 --- a/drivers/rtc/rtc-isl12022.c +++ b/drivers/rtc/rtc-isl12022.c @@ -10,6 +10,7 @@ #include <linux/bcd.h> #include <linux/bitfield.h> +#include <linux/clk-provider.h> #include <linux/err.h> #include <linux/hwmon.h> #include <linux/i2c.h> @@ -44,6 +45,9 @@ #define ISL12022_SR_LBAT75 (1 << 1) #define ISL12022_INT_WRTC (1 << 6) +#define ISL12022_INT_FO_MASK GENMASK(3, 0) +#define ISL12022_INT_FO_OFF 0x0 +#define ISL12022_INT_FO_32K 0x1 #define ISL12022_REG_VB85_MASK GENMASK(5, 3) #define ISL12022_REG_VB75_MASK GENMASK(2, 0) @@ -242,6 +246,41 @@ static const struct regmap_config regmap_config = { .use_single_write = true, }; +static int isl12022_register_clock(struct device *dev) +{ + struct regmap *regmap = dev_get_drvdata(dev); + struct clk_hw *hw; + int ret; + + if (!device_property_present(dev, "#clock-cells")) { + /* + * Disabling the F_OUT pin reduces the power + * consumption in battery mode by ~25%. + */ + regmap_update_bits(regmap, ISL12022_REG_INT, ISL12022_INT_FO_MASK, + ISL12022_INT_FO_OFF); + + return 0; + } + + if (!IS_ENABLED(CONFIG_COMMON_CLK)) + return 0; + + /* + * For now, only support a fixed clock of 32768Hz (the reset default). + */ + ret = regmap_update_bits(regmap, ISL12022_REG_INT, + ISL12022_INT_FO_MASK, ISL12022_INT_FO_32K); + if (ret) + return ret; + + hw = devm_clk_hw_register_fixed_rate(dev, "isl12022", NULL, 0, 32768); + if (IS_ERR(hw)) + return PTR_ERR(hw); + + return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw); +} + static const u32 trip_levels[2][7] = { { 2125000, 2295000, 2550000, 2805000, 3060000, 4250000, 4675000 }, { 1875000, 2025000, 2250000, 2475000, 2700000, 3750000, 4125000 }, @@ -288,6 +327,7 @@ static int isl12022_probe(struct i2c_client *client) { struct rtc_device *rtc; struct regmap *regmap; + int ret; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) return -ENODEV; @@ -300,6 +340,10 @@ static int isl12022_probe(struct i2c_client *client) dev_set_drvdata(&client->dev, regmap); + ret = isl12022_register_clock(&client->dev); + if (ret) + return ret; + isl12022_set_trip_levels(&client->dev); isl12022_hwmon_register(&client->dev); |