| Message ID | 20190812232850.8016-2-khilman@kernel.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | rtc: add new Amlogic Virtual Wake RTC | expand |
On 12/08/2019 16:28:49-0700, Kevin Hilman wrote: > From: Kevin Hilman <khilman@baylibre.com> > > 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> > --- > .../bindings/rtc/rtc-meson-vrtc.txt | 22 +++++++++++++++++++ > 1 file changed, 22 insertions(+) > create mode 100644 Documentation/devicetree/bindings/rtc/rtc-meson-vrtc.txt > Applied, thanks.
diff --git a/Documentation/devicetree/bindings/rtc/rtc-meson-vrtc.txt b/Documentation/devicetree/bindings/rtc/rtc-meson-vrtc.txt new file mode 100644 index 000000000000..c014f54a9853 --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/rtc-meson-vrtc.txt @@ -0,0 +1,22 @@ +* 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>; + };