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

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Date:   Mon, 29 Mar 2021 00:02:29 +0300
From:   Kirill Kapranov <kirill.kapranov@...pulab.co.il>
To:     a.zummo@...ertech.it, alexandre.belloni@...tlin.com,
        phdm@...qel.be, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Kirill Kapranov <kirill.kapranov@...pulab.co.il>
Subject: [PATCH 1/4] dt-bindings: rtc: abracon,abx80x: Add sqw property

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@...pulab.co.il>
---
 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