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dt-bindings: rtc: new binding for Amlogic VRTC

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Add binding fo the new VRTC driver for Amlogic SoCs.  The 64-bit
family of SoCs only has an RTC managed by firmware, and this VRTC
driver provides the simple, one-register firmware interface.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20190812232850.8016-2-khilman@kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Kevin Hilman 2019-08-12 16:28:49 -07:00 committed by Alexandre Belloni
parent a6f26606dd
commit ed16239637
1 changed files with 22 additions and 0 deletions
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22
Documentation/devicetree/bindings/rtc/rtc-meson-vrtc.txt Normal file
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* Amlogic Virtual RTC (VRTC)
This is a Linux interface to an RTC managed by firmware, hence it's
virtual from a Linux perspective. The interface is 1 register where
an alarm time (in seconds) is to be written.
Required properties:
- compatible: should be "amlogic,meson-vrtc"
- reg: physical address for the alarm register
The alarm register is a simple scratch register shared between the
application processors (AP) and the secure co-processor (SCP.) When
the AP suspends, the SCP will use the value of this register to
program an always-on timer before going sleep. When the timer expires,
the SCP will wake up and will then wake the AP.
Example:
vrtc: rtc@0a8 {
compatible = "amlogic,meson-vrtc";
reg = <0x0 0x000a8 0x0 0x4>;
};