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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@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Johan Hovold <johan@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Boris BREZILLON 2014-09-11 15:18:45 +02:00 committed by Lee Jones
parent 2adb3b8e6f
commit c896e68ec1
1 changed files with 15 additions and 0 deletions
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Documentation/devicetree/bindings/mfd/atmel,gpbr.txt Normal file
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* 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@fffffd50 {
compatible = "atmel,at91sam9260-gpbr", "syscon";
reg = <0xfffffd50 0x10>;
};