mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-29 14:05:19 +08:00
275876e208
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>
48 lines
1.2 KiB
Plaintext
48 lines
1.2 KiB
Plaintext
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;
|
|
};
|