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Subject[RFC/PATCH 1/2] dt-binding: mfd: Add Maxim/Dallas DS1374 MFD device binding
Date
This adds a binding for the Maxim/Dallas DS1374 MFD.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
---

Hi all,

I'm not entirely sure aobut the binding, does anyone
have a better suggestion for the remap-wdt-reset property?

Thanks,

Moritz

---
Documentation/devicetree/bindings/mfd/ds1374.txt | 63 ++++++++++++++++++++++
.../devicetree/bindings/trivial-devices.txt | 1 -
drivers/rtc/Kconfig | 2 +
3 files changed, 65 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/mfd/ds1374.txt

diff --git a/Documentation/devicetree/bindings/mfd/ds1374.txt b/Documentation/devicetree/bindings/mfd/ds1374.txt
new file mode 100644
index 0000000..b22396f
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/ds1374.txt
@@ -0,0 +1,63 @@
+* Device tree bindings for Maxim/Dallas DS1374 Multi Function Device (MFD)
+
+The Maxim/Dallas DS1374 is a multi function device that combines rtc,
+watchdog or alarm, as well as trickle charger.
+
+The DS1374 is connected via I2C.
+
+Required properties:
+- compatible: "dallas,ds1374"
+- reg: I2C slave address
+- dallas,ds1374-mode: Should be one of the following values:
+ <0> for RTC
+ <1> for RTC + Alarm (Interrupt)
+ <2> for RTC + Watchdog
+
+Required child:
+A single available child device of type matching the "dallas,ds1374-mode"
+property.
+
+Optional properties (watchdog):
+- dallas,ds1374-remap-wdt-reset: Boolean describing whether the INT pin
+ on the device is used as interrupt for
+ the alarm
+
+See ../watchdog/* for generic watchdog bindings.
+
+Optional properties (real time clock):
+- interrupt: phandle to interrupt cell for the rtc's alarm feature
+
+See ../rtc/* for generic rtc bindings.
+
+Optional properties (trickle-charger):
+- dallas,trickle-resistor-ohms : Selected resistor for trickle charger
+ Values usable for ds1374 are 250, 2000, 4000
+ Should be given if trickle charger should be enabled
+- dallas,trickle-diode-disable : Do not use internal trickle charger diode
+ Should be given if internal trickle charger diode should be disabled
+
+Example for rtc with alarm mode and interrupt:
+
+i2c@12ca0000 {
+ rtc@68 {
+ compatible = "ds1374";
+ reg = <0x68>;
+ interrupts = <&gpio0 62>;
+ dallas,ds1374-mode = <2>
+
+ dallas,trickle-resistor-ohms = <250>;
+ dallas,trickle-diode-disable;
+ };
+};
+
+Example for rtc with watchdog and reset on timeout, with reset remapped
+to the INT pin:
+
+i2c@12ca0000 {
+ rtc@68 {
+ compatible = "ds1374";
+ reg = <0x68>;
+ dallas,ds1374-mode = <2>
+ dallas,ds1374-remap-wdt-reset;
+ };
+};
diff --git a/Documentation/devicetree/bindings/trivial-devices.txt b/Documentation/devicetree/bindings/trivial-devices.txt
index 3e0a34c..f7a50e5 100644
--- a/Documentation/devicetree/bindings/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/trivial-devices.txt
@@ -29,7 +29,6 @@ cirrus,cs42l51 Cirrus Logic CS42L51 audio codec
dallas,ds1307 64 x 8, Serial, I2C Real-Time Clock
dallas,ds1338 I2C RTC with 56-Byte NV RAM
dallas,ds1340 I2C RTC with Trickle Charger
-dallas,ds1374 I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
dallas,ds1631 High-Precision Digital Thermometer
dallas,ds1682 Total-Elapsed-Time Recorder with Alarm
dallas,ds1775 Tiny Digital Thermometer and Thermostat
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 8d3b957..e6763fe 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -250,6 +250,8 @@ config RTC_DRV_DS1307_CENTURY

config RTC_DRV_DS1374
tristate "Dallas/Maxim DS1374"
+ depends on MFD_DS1374
+ depends on REGMAP_I2C
help
If you say yes here you get support for Dallas Semiconductor
DS1374 real-time clock chips. If an interrupt is associated
--
2.7.4
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