linux-kernel - [PATCH v4 9/9] mfd: syscon: add Atmel GPBR DT bindings documention

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Message-Id: <1410441525-25258-10-git-send-email-boris.brezillon@free-electrons.com>
Date:	Thu, 11 Sep 2014 15:18:45 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Andrew Victor <linux@...im.org.za>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, Johan Hovold <jhovold@...il.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Subject: [PATCH v4 9/9] mfd: syscon: add Atmel GPBR DT bindings documention

The GPBR block provides a set of battery-backed registers that can be used
to save data which need to be kept when the system is powered down and
VDD-core is maintained by an external battery.

A typical usage is the RTT block (when used as an RTC) which needs one of
those registers to save the current time.

Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
---
 Documentation/devicetree/bindings/mfd/atmel,gpbr.txt | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/atmel,gpbr.txt

diff --git a/Documentation/devicetree/bindings/mfd/atmel,gpbr.txt b/Documentation/devicetree/bindings/mfd/atmel,gpbr.txt
new file mode 100644
index 0000000..a285695
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/atmel,gpbr.txt
@@ -0,0 +1,15 @@
+* Device tree bindings for Atmel GPBR (General Purpose Backup Registers)
+
+The GPBR are a set of battery-backed registers.
+
+Required properties:
+- compatible:		"atmel,at91sam9260-gpbr", "syscon"
+- reg:			contains offset/length value of the GPBR memory
+			region.
+
+Example:
+
+gpbr: gpbr@...ffd50 {
+	compatible = "atmel,at91sam9260-gpbr", "syscon";
+	reg = <0xfffffd50 0x10>;
+};
-- 
1.9.1

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