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| author |   Xiubo Li <Li.Xiubo@freescale.com> | 2014-07-15 12:23:03 +0800 |
|---|---|---|
| committer |   Mark Brown <broonie@linaro.org> | 2014-08-16 16:56:23 -0500 |
| commit | 275876e208e28abf4b96ec89030e482b1331ee75 (patch) | |
| tree | 1029bfc5360c6a7d8b285e7c3ac38c79f85dea25 /Documentation/devicetree/bindings/regmap | |
| parent | regmap: add DT endianness binding support. (diff) | |
| download | linux-dev-275876e208e28abf4b96ec89030e482b1331ee75.tar.xz linux-dev-275876e208e28abf4b96ec89030e482b1331ee75.zip | |
regmap: Add the DT binding documentation for endianness
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>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/regmap')
| -rw-r--r-- | Documentation/devicetree/bindings/regmap/regmap.txt | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/regmap/regmap.txt b/Documentation/devicetree/bindings/regmap/regmap.txt new file mode 100644 index 000000000000..b494f8b8ef72 --- /dev/null +++ b/Documentation/devicetree/bindings/regmap/regmap.txt @@ -0,0 +1,47 @@ +Device-Tree binding for regmap + +The endianness mode of CPU & Device scenarios: +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. + +Required properties: +- {big,little}-endian: these are boolean properties, if absent + meaning that the CPU and the Device are in the same endianness mode, + these properties are for register values and all the buffers only. + +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; +}; |