linux-kernel - [PATCHv3 resend 1/2] dt/bindings: Add the DT binding documentation for endianness

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Message-ID: <1398847921-9322-2-git-send-email-Li.Xiubo@freescale.com>
Date:	Wed, 30 Apr 2014 16:52:00 +0800
From:	Xiubo Li <Li.Xiubo@...escale.com>
To:	<mark.rutland@....com>, <broonie@...nel.org>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <rob@...dley.net>,
	<richardcochran@...il.com>
CC:	<gregkh@...uxfoundation.org>, <mpa@...gutronix.de>,
	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Xiubo Li <Li.Xiubo@...escale.com>
Subject: [PATCHv3 resend 1/2] dt/bindings: Add the DT binding documentation for endianness

Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>
---
 .../devicetree/bindings/endianness/endianness.txt  | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/endianness/endianness.txt

diff --git a/Documentation/devicetree/bindings/endianness/endianness.txt b/Documentation/devicetree/bindings/endianness/endianness.txt
new file mode 100644
index 0000000..49458a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/endianness/endianness.txt
@@ -0,0 +1,47 @@
+Device-Tree binding for device endianness
+
+The endianness mode of CPU & Device scenarios:
+Index    CPU       Device     Endianess flag for DT bool property
+------------------------------------------------------------
+1        LE        LE         -
+2        LE        BE         'big-endian{,-*}'
+3        BE        BE         -
+4        BE        LE         'little-endian{,-*}'
+
+For one device driver, which will run in different scenarios above
+on different SoCs using the devicetree, we need one way to simplify
+this.
+
+Required properties:
+- {big,little}-endian{,-*}: this is one boolean property.
+
+Examples:
+Scenario 1 : CPU in LE mode & device in LE mode.
+dev: dev@...31000 {
+	      compatible = "name";
+	      reg = <0x40031000 0x1000>;
+	      ...
+};
+
+Scenario 2 : CPU in LE mode & device in BE mode.
+dev: dev@...31000 {
+	      compatible = "name";
+	      reg = <0x40031000 0x1000>;
+	      ...
+	      big-endian{,-*};
+};
+
+Scenario 3 : CPU in BE mode & device in BE mode.
+dev: dev@...31000 {
+	      compatible = "name";
+	      reg = <0x40031000 0x1000>;
+	      ...
+};
+
+Scenario 4 : CPU in BE mode & device in LE mode.
+dev: dev@...31000 {
+	      compatible = "name";
+	      reg = <0x40031000 0x1000>;
+	      ...
+	      little-endian{,-*};
+};
-- 
1.8.4

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