linux-kernel - [PATCH v2 1/2] devicetree: add binding for generic mmio clocksource

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Date:	Wed,  7 Oct 2015 16:37:13 +0100
From:	Mans Rullgard <mans@...sr.com>
To:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] devicetree: add binding for generic mmio clocksource

This adds a DT binding for a generic mmio clocksource as implemented
by clocksource_mmio_init().

Signed-off-by: Mans Rullgard <mans@...sr.com>
---
Changed in v2:
- added sched_clock support
---
 .../devicetree/bindings/timer/clocksource-mmio.txt | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/clocksource-mmio.txt

diff --git a/Documentation/devicetree/bindings/timer/clocksource-mmio.txt b/Documentation/devicetree/bindings/timer/clocksource-mmio.txt
new file mode 100644
index 0000000..cfb3601
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/clocksource-mmio.txt
@@ -0,0 +1,28 @@
+Generic MMIO clocksource
+
+Required properties:
+
+- compatible: should be "clocksource-mmio"
+- reg: the physical address of the counter register
+- reg-io-width: size of counter register in bytes, should be 2 or 4
+- clocks: phandle to the source clock
+- clocksource-bits: number of valid bits
+- clocksource-rating: rating of the clocksource
+
+Optional properties:
+
+- clocksource-counts-down: indicates that counter counts down
+- label: name of the clocksource
+- linux,sched-clock: boolean, register clocksource as sched_clock
+
+Example:
+
+clocksource {
+	compatible = "clocksource-mmio";
+	reg = <0x10000 4>;
+	reg-io-width = <4>;
+	clocksource-bits = <32>;
+	clocksource-rating = <300>;
+	clocks = <&clk>;
+	linux,sched_clock;
+}
-- 
2.5.3

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