From: Kevin Hilman <khilman@kernel.org>
To: Alexandre Belloni <alexandre.belloni@bootlin.com>,
linux-rtc@vger.kernel.org
Cc: linux-amlogic@lists.infradead.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Neil Armstrong <narmstrong@baylibre.com>
Subject: [PATCH v3 1/2] dt-bindings: rtc: new binding for Amlogic VRTC
Date: Mon, 12 Aug 2019 16:28:49 -0700 [thread overview]
Message-ID: <20190812232850.8016-2-khilman@kernel.org> (raw)
In-Reply-To: <20190812232850.8016-1-khilman@kernel.org>
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
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>;
+ };
--
2.22.0
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next prev parent reply other threads:[~2019-08-12 23:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 23:28 [PATCH v3 0/2] rtc: add new Amlogic Virtual Wake RTC Kevin Hilman
2019-08-12 23:28 ` Kevin Hilman [this message]
2019-08-22 21:11 ` [PATCH v3 1/2] dt-bindings: rtc: new binding for Amlogic VRTC Alexandre Belloni
2019-08-12 23:28 ` [PATCH v3 2/2] rtc: Add Amlogic Virtual Wake RTC Kevin Hilman
2019-08-22 21:11 ` Alexandre Belloni
2019-08-22 20:52 ` [PATCH v3 0/2] rtc: add new " Kevin Hilman
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