rtc: ds1307: add basic support for ds1341 chip

This adds support for reading and writing date/time from/to ds1341 chip.

ds1341 chip has other features - alarms, input clock (can be used instead
of intercal oscillator for better accuracy), output clock ("square wave
generation"). However, not all of that is available at the same time.
Same chip pins, CLKIN/nINTA and SQW/nINTB, can be used either for
input/output clocks, or for alarm interrupts. Role of these pins on
particular board depends on hardware wiring.

We can add device tree properties that describe if each of pins is wired
as clock, or as interrupt, or left unconnected, and enable support for
corresponding functionality based on that. But that is cumbersome, requires
hardware for testing, and has to deal with bit enabling/disabling output
clock also affects which pins alarm interrupts are routed to.

Another factor is that there are hardware setups (i.e. ZII RDU2) that
power DS1341 from SuperCap, which makes power saving critical. For such
setups, kernel driver should leave register bits that control mentioned
pins in the state configured by bootloader.

Given all that, it was decided to limit support to "only date/time" for
now. That is enough for common use case. Full (and cumbersome)
implementation can be added later if ever needed.

Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 3e82ddce620e..6038c49ed68a 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -39,6 +39,7 @@ enum ds_type {
 	ds_1338,
 	ds_1339,
 	ds_1340,
+	ds_1341,
 	ds_1388,
 	ds_3231,
 	m41t0,
@@ -206,6 +207,10 @@ static const struct chip_desc chips[last_ds_type] = {
 		.century_bit	= DS1340_BIT_CENTURY,
 		.trickle_charger_reg = 0x08,
 	},
+	[ds_1341] = {
+		.century_reg	= DS1307_REG_MONTH,
+		.century_bit	= DS1337_BIT_CENTURY,
+	},
 	[ds_1388] = {
 		.offset		= 1,
 		.trickle_charger_reg = 0x0a,
@@ -243,6 +248,7 @@ static const struct i2c_device_id ds1307_id[] = {
 	{ "ds1339", ds_1339 },
 	{ "ds1388", ds_1388 },
 	{ "ds1340", ds_1340 },
+	{ "ds1341", ds_1341 },
 	{ "ds3231", ds_3231 },
 	{ "m41t0", m41t0 },
 	{ "m41t00", m41t00 },
@@ -287,6 +293,10 @@ static const struct of_device_id ds1307_of_match[] = {
 		.data = (void *)ds_1340
 	},
 	{
+		.compatible = "dallas,ds1341",
+		.data = (void *)ds_1341
+	},
+	{
 		.compatible = "maxim,ds3231",
 		.data = (void *)ds_3231
 	},
@@ -332,6 +342,7 @@ static const struct acpi_device_id ds1307_acpi_ids[] = {
 	{ .id = "DS1339", .driver_data = ds_1339 },
 	{ .id = "DS1388", .driver_data = ds_1388 },
 	{ .id = "DS1340", .driver_data = ds_1340 },
+	{ .id = "DS1341", .driver_data = ds_1341 },
 	{ .id = "DS3231", .driver_data = ds_3231 },
 	{ .id = "M41T0", .driver_data = m41t0 },
 	{ .id = "M41T00", .driver_data = m41t00 },
@@ -1408,6 +1419,7 @@ static int ds1307_probe(struct i2c_client *client,
 	switch (ds1307->type) {
 	case ds_1337:
 	case ds_1339:
+	case ds_1341:
 	case ds_3231:
 		/* get registers that the "rtc" read below won't read... */
 		err = regmap_bulk_read(ds1307->regmap, DS1337_REG_CONTROL,