[PATCH 1/4] dt-bindings: rtc: abracon,abx80x: Add sqw property

[Kirill Kapranov]

Introduce the string property "sqw" to control Square Wave Output register.
This enables pulse generation output, that is useful for xtal calibration
or for an external usage.

Signed-off-by: Kirill Kapranov <kirill.kapranov@xxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/rtc/abracon,abx80x.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/rtc/abracon,abx80x.txt b/Documentation/devicetree/bindings/rtc/abracon,abx80x.txt
index 2405e35a1bc0..4c545ece33b5 100644
--- a/Documentation/devicetree/bindings/rtc/abracon,abx80x.txt
+++ b/Documentation/devicetree/bindings/rtc/abracon,abx80x.txt
@@ -29,3 +29,15 @@ and valid to enable charging:
  - "abracon,tc-diode": should be "standard" (0.6V) or "schottky" (0.3V)
  - "abracon,tc-resistor": should be <0>, <3>, <6> or <11>. 0 disables the output
                           resistor, the other values are in kOhm.
+
+The RTC can produce square wave output on a dedicated pin for an external usage
+or for calibration purpose. A valid string should be assigned to the "sqw"
+property to enable the output:
+
+ - "sqw": should be one of the following:
+	"1_century", "32768_Hz", "8192_Hz", "4096_Hz", "2048_Hz", "1024_Hz",
+	"512_Hz", "256_Hz", "128_Hz", "64_Hz", "32_Hz", "16_Hz", "8_Hz", "4_Hz",
+	"2_Hz", "1_Hz",	"1/2_Hz", "1/4_Hz", "1/8_Hz", "1/16_Hz", "1/32_Hz",
+	"1_min", "16384_Hz", "100_Hz", "1_hour", "1_day", "TIRQ", "nTIRQ",
+	"1_year", "1_Hz_to_Counters", "1/32_Hz_from_Acal", "1/8_Hz_from_Acal",
+	"none"
-- 
2.11.0