linux-kernel - [PATCH 3/5] MIPS: Document Pistachio boot protocol and device-tree bindings

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Message-Id: <1424741507-8882-4-git-send-email-abrestic@chromium.org>
Date:	Mon, 23 Feb 2015 17:31:45 -0800
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org,
	Andrew Bresticker <abrestic@...omium.org>,
	Ezequiel Garcia <ezequiel.garcia@...tec.com>,
	James Hartley <james.hartley@...tec.com>,
	James Hogan <james.hogan@...tec.com>,
	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>
Subject: [PATCH 3/5] MIPS: Document Pistachio boot protocol and device-tree bindings

The Pistachio SoC boots only with device-tree.  Document the required
properties and nodes as well as the boot protocol between the bootlaoder
and the kernel.

Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Pawel Moll <pawel.moll@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
Cc: Kumar Gala <galak@...eaurora.org>
---
 .../devicetree/bindings/mips/img/pistachio.txt     | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mips/img/pistachio.txt

diff --git a/Documentation/devicetree/bindings/mips/img/pistachio.txt b/Documentation/devicetree/bindings/mips/img/pistachio.txt
new file mode 100644
index 0000000..18522b7
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/img/pistachio.txt
@@ -0,0 +1,40 @@
+Imagination Pistachio SoC
+=========================
+
+Required properties:
+--------------------
+ - compatible: Must include "img,pistachio".
+
+CPU nodes:
+----------
+A "cpus" node is required.  Required properties:
+ - #address-cells: Must be 1.
+ - #size-cells: Must be 0.
+A CPU sub-node is also required for at least CPU 0.  Since the topology may
+be probed via CPS, it is not necessary to specify secondary CPUs.  Required
+propertis:
+ - device_type: Must be "cpu".
+ - compatible: Must be "mti,interaptiv".
+ - reg: CPU number.
+ - clocks: Must include the CPU clock.  See ../../clock/clock-bindings.txt for
+   details on clock bindings.
+Example:
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu0: cpu@0 {
+			device_type = "cpu";
+			compatible = "mti,interaptiv";
+			reg = <0>;
+			clocks = <&clk_core CLK_MIPS>;
+		};
+	};
+
+
+Boot protocol:
+--------------
+The bootloader must pass the following arguments to the kernel:
+ - $a0: 0x0.
+ - $a1: 0xffffffff.
+ - $a2: Physical address of the flattened device-tree blob.
-- 
2.2.0.rc0.207.ga3a616c

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