ed16239637
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>
23 lines
746 B
Plaintext
23 lines
746 B
Plaintext
* Amlogic Virtual RTC (VRTC)
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This is a Linux interface to an RTC managed by firmware, hence it's
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virtual from a Linux perspective. The interface is 1 register where
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an alarm time (in seconds) is to be written.
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Required properties:
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- compatible: should be "amlogic,meson-vrtc"
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- reg: physical address for the alarm register
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The alarm register is a simple scratch register shared between the
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application processors (AP) and the secure co-processor (SCP.) When
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the AP suspends, the SCP will use the value of this register to
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program an always-on timer before going sleep. When the timer expires,
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the SCP will wake up and will then wake the AP.
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Example:
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vrtc: rtc@0a8 {
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compatible = "amlogic,meson-vrtc";
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reg = <0x0 0x000a8 0x0 0x4>;
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};
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