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linux-next/Documentation/devicetree/bindings/timer/marvell,armada-370-xp-timer.txt
Ezequiel Garcia 4a22d9c93a clocksource: armada-370-xp: Use the reference clock on A375 SoC
The 25 MHz reference clock has better stability so its use is preferred over the
core clock.

This commit takes advantage of the already introduced Armada 375 devicetree
compatible string and adds a new timer initialization. If available, the timer
will use the reference clock (named as 'fixed'). Otherwise, it falls back to the
previous behavior.

Acked-by: Jason Cooper <jason@lakedaemon.net>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Wim Van Sebroeck <wim@iguana.be>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2014-11-26 13:51:08 +01:00

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Marvell Armada 370 and Armada XP Timers
---------------------------------------
Required properties:
- compatible: Should be one of the following
"marvell,armada-370-timer",
"marvell,armada-375-timer",
"marvell,armada-xp-timer".
- interrupts: Should contain the list of Global Timer interrupts and
then local timer interrupts
- reg: Should contain location and length for timers register. First
pair for the Global Timer registers, second pair for the
local/private timers.
Clocks required for compatible = "marvell,armada-370-timer":
- clocks : Must contain a single entry describing the clock input
Clocks required for compatibles = "marvell,armada-xp-timer",
"marvell,armada-375-timer":
- clocks : Must contain an entry for each entry in clock-names.
- clock-names : Must include the following entries:
"nbclk" (L2/coherency fabric clock),
"fixed" (Reference 25 MHz fixed-clock).
Examples:
- Armada 370:
timer {
compatible = "marvell,armada-370-timer";
reg = <0x20300 0x30>, <0x21040 0x30>;
interrupts = <37>, <38>, <39>, <40>, <5>, <6>;
clocks = <&coreclk 2>;
};
- Armada XP:
timer {
compatible = "marvell,armada-xp-timer";
reg = <0x20300 0x30>, <0x21040 0x30>;
interrupts = <37>, <38>, <39>, <40>, <5>, <6>;
clocks = <&coreclk 2>, <&refclk>;
clock-names = "nbclk", "fixed";
};