linux-kernel - [PATCH V5 2/4] of: Add binding document for MIPS GIC

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Date:	Wed, 12 Nov 2014 11:43:37 -0800
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Ralf Baechle <ralf@...ux-mips.org>,
	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>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Andrew Bresticker <abrestic@...omium.org>,
	John Crispin <blogic@...nwrt.org>,
	David Daney <ddaney.cavm@...il.com>,
	Qais Yousef <qais.yousef@...tec.com>,
	James Hogan <james.hogan@...tec.com>,
	Arnd Bergmann <arnd@...db.de>, linux-mips@...ux-mips.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V5 2/4] of: Add binding document for MIPS GIC

The Global Interrupt Controller (GIC) present on certain MIPS systems
can be used to route external interrupts to individual VPEs and CPU
interrupt vectors.  It also supports a timer and software-generated
interrupts.

Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
Acked-by: Arnd Bergmann <arnd@...db.de>
---
No changes from v4.
Changes from v3:
 - removed CPU name from compatible string
 - removed available-cpu-vectors, added reserved-cpu-vectors
 - made reg property optional
Changes from v2:
 - added third cell to specify local vs. shared
 - added documentation for timer sub-node
 - changed compatible string to include CPU version
Changes from v1:
 - moved from mips/ to interrupt-controller/
 - removed interrupts and interrupt-parent properties
 - added available-cpu-vectors property
 - dropped third cell in interrupt specifier
---
 .../bindings/interrupt-controller/mips-gic.txt     | 55 ++++++++++++++++++++++
 .../dt-bindings/interrupt-controller/mips-gic.h    |  9 ++++
 2 files changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt
 create mode 100644 include/dt-bindings/interrupt-controller/mips-gic.h

diff --git a/Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt b/Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt
new file mode 100644
index 0000000..5a65478
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/mips-gic.txt
@@ -0,0 +1,55 @@
+MIPS Global Interrupt Controller (GIC)
+
+The MIPS GIC routes external interrupts to individual VPEs and IRQ pins.
+It also supports local (per-processor) interrupts and software-generated
+interrupts which can be used as IPIs.  The GIC also includes a free-running
+global timer, per-CPU count/compare timers, and a watchdog.
+
+Required properties:
+- compatible : Should be "mti,gic".
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : Specifies the number of cells needed to encode an
+  interrupt specifier.  Should be 3.
+  - The first cell is the type of interrupt, local or shared.
+    See <include/dt-bindings/interrupt-controller/mips-gic.h>.
+  - The second cell is the GIC interrupt number.
+  - The third cell encodes the interrupt flags.
+    See <include/dt-bindings/interrupt-controller/irq.h> for a list of valid
+    flags.
+
+Optional properties:
+- reg : Base address and length of the GIC registers.  If not present,
+  the base address reported by the hardware GCR_GIC_BASE will be used.
+- mti,reserved-cpu-vectors : Specifies the list of CPU interrupt vectors
+  to which the GIC may not route interrupts.  Valid values are 2 - 7.
+  This property is ignored if the CPU is started in EIC mode.
+
+Required properties for timer sub-node:
+- compatible : Should be "mti,gic-timer".
+- interrupts : Interrupt for the GIC local timer.
+- clock-frequency : Clock frequency at which the GIC timers operate.
+
+Example:
+
+	gic: interrupt-controller@...c0000 {
+		compatible = "mti,gic";
+		reg = <0x1bdc0000 0x20000>;
+
+		interrupt-controller;
+		#interrupt-cells = <3>;
+
+		mti,reserved-cpu-vectors = <7>;
+
+		timer {
+			compatible = "mti,gic-timer";
+			interrupts = <GIC_LOCAL 1 IRQ_TYPE_NONE>;
+			clock-frequency = <50000000>;
+		};
+	};
+
+	uart@...01400 {
+		...
+		interrupt-parent = <&gic>;
+		interrupts = <GIC_SHARED 24 IRQ_TYPE_LEVEL_HIGH>;
+		...
+	};
diff --git a/include/dt-bindings/interrupt-controller/mips-gic.h b/include/dt-bindings/interrupt-controller/mips-gic.h
new file mode 100644
index 0000000..cf35a57
--- /dev/null
+++ b/include/dt-bindings/interrupt-controller/mips-gic.h
@@ -0,0 +1,9 @@
+#ifndef _DT_BINDINGS_INTERRUPT_CONTROLLER_MIPS_GIC_H
+#define _DT_BINDINGS_INTERRUPT_CONTROLLER_MIPS_GIC_H
+
+#include <dt-bindings/interrupt-controller/irq.h>
+
+#define GIC_SHARED 0
+#define GIC_LOCAL 1
+
+#endif
-- 
2.1.0.rc2.206.gedb03e5

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