linux-kernel - [PATCHv2 2/3] regmap: Add the DT binding documentation for endianness

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Date:	Wed, 23 Apr 2014 14:46:34 +0800
From:	Xiubo Li <Li.Xiubo@...escale.com>
To:	<broonie@...nel.org>, <rob@...dley.net>
CC:	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Xiubo Li <Li.Xiubo@...escale.com>
Subject: [PATCHv2 2/3] regmap: Add the DT binding documentation for endianness

Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>
---
 .../bindings/regmap/regmap-endianness.txt          | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/regmap/regmap-endianness.txt

diff --git a/Documentation/devicetree/bindings/regmap/regmap-endianness.txt b/Documentation/devicetree/bindings/regmap/regmap-endianness.txt
new file mode 100644
index 0000000..1d838c5
--- /dev/null
+++ b/Documentation/devicetree/bindings/regmap/regmap-endianness.txt
@@ -0,0 +1,48 @@
+Device-Tree bindings for regmap endianness
+
+Required properties:
+- regmap-reg-endian: register endianness, see ../endianness/endianness.txt
+  for detail.
+- regmap-val-endian: value endianness, see ../endianness/endianness.txt for
+  detail.
+
+The Endianness flags supported by regmap:
+DT properties           Macros
+----------------------------------------
+    'le'          REGMAP_ENDIAN_LITTLE
+    'be'          REGMAP_ENDIAN_BIG
+    'native'      REGMAP_ENDIAN_NATIVE
+    Absent        REGMAP_ENDIAN_DEFAULT
+
+Examples for using the regmap-mmio:
+Scenario 1 : CPU in LE mode & device in LE mode.
+dev: dev@...31000 {
+	      compatible = "name";
+	      reg = <0x40031000 0x1000>;
+	      ...
+	      regmap-val-endian = 'native'; or just absent.
+};
+
+Scenario 2 : CPU in LE mode & device in BE mode.
+dev: dev@...31000 {
+	      compatible = "name";
+	      reg = <0x40031000 0x1000>;
+	      ...
+	      regmap-val-endian = 'be';
+};
+
+Scenario 3 : CPU in BE mode & device in BE mode.
+dev: dev@...31000 {
+	      compatible = "name";
+	      reg = <0x40031000 0x1000>;
+	      ...
+	      regmap-val-endian = 'native'; or just absent.
+};
+
+Scenario 4 : CPU in BE mode & device in LE mode.
+dev: dev@...31000 {
+	      compatible = "name";
+	      reg = <0x40031000 0x1000>;
+	      ...
+	      regmap-val-endian = 'le';
+};
-- 
1.8.4

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