Commit 2caeb566 authored by Rasmus Villemoes's avatar Rasmus Villemoes Committed by Alexandre Belloni
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rtc: isl12022: add support for trip level DT binding 



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: default avatarRasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20230615105826.411953-5-linux@rasmusvillemoes.dk


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 69b569c1

drivers/rtc/rtc-isl12022.c

+39 −0
Original line number Diff line number Diff line
@@ -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);