From: Sam Ravnborg <sam@ravnborg.org>
To: Alessandro Zummo <a.zummo@towertech.it>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Andrew Jeffery <andrew@aj.id.au>,
Fabio Estevam <fabio.estevam@nxp.com>,
Joel Stanley <joel@jms.id.au>,
Mark Rutland <mark.rutland@arm.com>,
Rob Herring <robh+dt@kernel.org>,
Russell King <linux@armlinux.org.uk>,
Sascha Hauer <s.hauer@pengutronix.de>,
Shawn Guo <shawnguo@kernel.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-rtc@vger.kernel.org
Cc: "Sam Ravnborg" <sam@ravnborg.org>, "Søren Andersen" <san@skov.dk>
Subject: [PATCH v1 2/5] dt-binding: rtc-pcf85063: add quartz load property
Date: Fri, 7 Sep 2018 21:35:05 +0200 [thread overview]
Message-ID: <20180907193508.24974-3-sam@ravnborg.org> (raw)
In-Reply-To: <20180822183555.GA24084@ravnborg.org>
From: Søren Andersen <san@skov.dk>
The NXP pcf85063 support two different quartz loads.
- 7 pF (default)
- 12.5 pF (minimum power consumption)
The pcf85063 needs to know the size of the external capacitor,
otherwise the RTC will have a bad precision (hours/week).
The power-on default is 7 pF
Add a property that tells if the external capacitor is 12.5 pF
Signed-off-by: Søren Andersen <san@skov.dk>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
---
.../devicetree/bindings/rtc/nxp,pcf85063.txt | 19 +++++++++++++++++++
Documentation/devicetree/bindings/trivial-devices.txt | 1 -
2 files changed, 19 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt
diff --git a/Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt
new file mode 100644
index 000000000000..22ebb2ce52c1
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/nxp,pcf85063.txt
@@ -0,0 +1,19 @@
+* NXP PCF85063 Real Time Clock
+
+NXP PCF85063 Real Time Clock
+
+Required properties:
+- compatible: Should contain "nxp,pcf85063".
+- reg: I2C address for chip.
+
+Optional property:
+- nxp,quartz_load_12.5pF: The capacitive load on the quartz is 12.5 pF,
+ which differ from the default value of 7 pF
+
+Example:
+
+pcf85063: pcf85063@51 {
+ compatible = "nxp,pcf85063";
+ reg = <0x51>;
+ nxp,quartz_load_12.5pF;
+};
diff --git a/Documentation/devicetree/bindings/trivial-devices.txt b/Documentation/devicetree/bindings/trivial-devices.txt
index 297dc82b67ad..440632682e31 100644
--- a/Documentation/devicetree/bindings/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/trivial-devices.txt
@@ -170,7 +170,6 @@ nxp,pca9557 8-bit I2C-bus and SMBus I/O port with reset
nxp,pcf2127 Real-time clock
nxp,pcf2129 Real-time clock
nxp,pcf8563 Real-time clock/calendar
-nxp,pcf85063 Tiny Real-Time Clock
oki,ml86v7667 OKI ML86V7667 video decoder
ovti,ov5642 OV5642: Color CMOS QSXGA (5-megapixel) Image Sensor with OmniBSI and Embedded TrueFocus
pericom,pt7c4338 Real-time Clock Module
--
2.12.0
next prev parent reply other threads:[~2018-09-07 19:36 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180822183555.GA24084@ravnborg.org>
2018-09-07 19:35 ` [PATCH v1 0/5] add quartz load support to NXP rtc drivers Sam Ravnborg
2018-09-07 19:35 ` [PATCH v1 1/5] dt-binding: rtci-pcf8523: add quartz_load property Sam Ravnborg
2018-09-07 21:43 ` Sam Ravnborg
2018-09-13 19:05 ` Alexandre Belloni
2018-09-13 20:44 ` Sam Ravnborg
2018-09-13 20:51 ` Alexandre Belloni
2018-09-26 15:47 ` Rob Herring
2018-09-26 18:51 ` Alexandre Belloni
2018-09-26 20:42 ` Sam Ravnborg
2018-09-07 19:35 ` Sam Ravnborg [this message]
2018-09-13 19:11 ` [PATCH v1 2/5] dt-binding: rtc-pcf85063: add quartz load property Alexandre Belloni
2018-09-07 19:35 ` [PATCH v1 3/5] dts: add nxp,quartz_load_12.5pf to all pcf8523 nodes Sam Ravnborg
2018-09-13 19:14 ` Alexandre Belloni
2018-09-07 19:35 ` [PATCH v1 4/5] rtc: pcf8523: external capacitor configuration Sam Ravnborg
2018-09-13 19:27 ` Alexandre Belloni
2018-09-07 19:35 ` [PATCH v1 5/5] rtc: pcf85063: " Sam Ravnborg
2018-09-13 19:29 ` Alexandre Belloni
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