[rtc-linux] [PATCH 1/3] dt-binding: rtc Add DT binding for NXP 85263 RTC

From: Martin Fuzzey <mfuzzey@parkeon.com>
To: Alessandro Zummo <a.zummo@towertech.it>,
	Rob Herring <robh+dt@kernel.org>,
	Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: devicetree@vger.kernel.org, rtc-linux@googlegroups.com
Subject: [rtc-linux] [PATCH 1/3] dt-binding: rtc Add DT binding for NXP 85263 RTC
Date: Mon, 01 Aug 2016 17:50:32 +0200	[thread overview]
Message-ID: <20160801155032.32232.68432.stgit@localhost> (raw)
In-Reply-To: <20160801155029.32232.56063.stgit@localhost>

Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
---
 .../devicetree/bindings/rtc/nxp,pcf85263.txt       |   41 ++++++++++++++++++++
 include/dt-bindings/rtc/nxp,pcf85263.h             |   14 +++++++
 2 files changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/nxp,pcf85263.txt
 create mode 100644 include/dt-bindings/rtc/nxp,pcf85263.h

diff --git a/Documentation/devicetree/bindings/rtc/nxp,pcf85263.txt b/Documentation/devicetree/bindings/rtc/nxp,pcf85263.txt
new file mode 100644
index 0000000..03b9505
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/nxp,pcf85263.txt
@@ -0,0 +1,41 @@
+NXP PCF85263 I2C Real Time Clock
+
+Required properties:
+- compatible: must be: "nxp,rtc-pcf85263"
+- reg: must be the I2C address
+
+Optional properties:
+- interrupt-names: Which interrupt signal is used must be "INTA" or "INTB"
+    Defaults to "INTA"
+
+- quartz-load-capacitance: The internal capacitor to select for the quartz:
+	PCF85263_QUARTZCAP_7pF		[0]
+	PCF85263_QUARTZCAP_6pF		[1]
+	PCF85263_QUARTZCAP_12p5pF	[2] DEFAULT
+
+- quartz-drive-strength: Drive strength for the quartz:
+	PCF85263_QUARTZDRIVE_NORMAL	[0] DEFAULT
+	PCF85263_QUARTZDRIVE_LOW	[1]
+	PCF85263_QUARTZDRIVE_HIGH	[2]
+
+- quartz-low-jitter: Boolean property, if present enables low jitter mode which
+    reduces jitter at the cost of increased power consumption.
+
+- wakeup-source: mark the chip as a wakeup source, independently of
+    the availability of an IRQ line connected to the SoC.
+    This is useful if the IRQ line is connected to a PMIC or other circuit
+    that can power up the device rather than to a normal SOC interrupt.
+
+Example:
+
+rtc@51 {
+	compatible = "nxp,pcf85263";
+	reg = <0x51>;
+
+	interrupt-parent = <&gpio4>;
+	interrupts = <5 IRQ_TYPE_LEVEL_LOW>;
+	interrupt-names = "INTB";
+
+	quartz-load-capacitance = <PCF85263_QUARTZCAP_12p5pF>;
+	quartz-drive-strength = <PCF85263_QUARTZDRIVE_LOW>;
+};
diff --git a/include/dt-bindings/rtc/nxp,pcf85263.h b/include/dt-bindings/rtc/nxp,pcf85263.h
new file mode 100644
index 0000000..ea87ae4
--- /dev/null
+++ b/include/dt-bindings/rtc/nxp,pcf85263.h
@@ -0,0 +1,14 @@
+#ifndef _DT_BINDINGS_RTC_NXP_PCF85263_H
+#define _DT_BINDINGS_RTC_NXP_PCF85263_H
+
+/* Quartz capacitance */
+#define PCF85263_QUARTZCAP_7pF		0
+#define PCF85263_QUARTZCAP_6pF		1
+#define PCF85263_QUARTZCAP_12p5pF	2
+
+/* Quartz drive strength */
+#define PCF85263_QUARTZDRIVE_NORMAL	0
+#define PCF85263_QUARTZDRIVE_LOW	1
+#define PCF85263_QUARTZDRIVE_HIGH	2
+
+#endif /* _DT_BINDINGS_RTC_NXP_PCF85263_H */

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