Messages in this thread Patch in this message | | | From | Xiubo Li <> | Subject | [PATCHv5 2/2] dt/bindings: Add the DT binding documentation for endianness | Date | Tue, 15 Jul 2014 12:18:24 +0800 |
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Device-Tree binding for device endianness Index Device Endianness properties --------------------------------------------------- 1 BE 'big-endian' 2 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.
Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> --- .../devicetree/bindings/regmap/regmap.txt | 48 ++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/regmap/regmap.txt
diff --git a/Documentation/devicetree/bindings/regmap/regmap.txt b/Documentation/devicetree/bindings/regmap/regmap.txt new file mode 100644 index 0000000..cc5f7f8 --- /dev/null +++ b/Documentation/devicetree/bindings/regmap/regmap.txt @@ -0,0 +1,48 @@ +Device-Tree binding for device endianness + +The endianness mode of CPU & Device scenarios: +Index CPU Device Endianness properties +------------------------------------------------------------ +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{,-*}: these are boolean properties, if absent + meaning that the CPU and the Device are in the same endianness mode. + +Examples: +Scenario 1 : CPU in LE mode & device in LE mode. +dev: dev@40031000 { + compatible = "name"; + reg = <0x40031000 0x1000>; + ... +}; + +Scenario 2 : CPU in LE mode & device in BE mode. +dev: dev@40031000 { + compatible = "name"; + reg = <0x40031000 0x1000>; + ... + big-endian{,-*}; +}; + +Scenario 3 : CPU in BE mode & device in BE mode. +dev: dev@40031000 { + compatible = "name"; + reg = <0x40031000 0x1000>; + ... +}; + +Scenario 4 : CPU in BE mode & device in LE mode. +dev: dev@40031000 { + compatible = "name"; + reg = <0x40031000 0x1000>; + ... + little-endian{,-*}; +}; -- 1.8.5
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