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authorArnd Bergmann <arnd@arndb.de>2016-03-17 18:23:40 +0100
committerMark Brown <broonie@kernel.org>2016-03-17 18:42:25 +0000
commit2596e07a3ed5a5f4d8b89be316c2b704d6f5dc5f (patch)
tree175d089ec68e5f6609fcd1577dab63b6b64083bf /Documentation
parentd25263d917caadba52275bf95c9b3400fe77edbe (diff)
downloadleg-kernel-2596e07a3ed5a5f4d8b89be316c2b704d6f5dc5f.tar.gz
regmap: fix documentation to match code
The regmap binding talks about one thing, which is register endianess, and it gets almost every aspect of it wrong. This replaces the current text of the file with a version that makes more sense and that matches what we implement now. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: a06c488da0b0 ("regmap: Add explict native endian flag to DT bindings") Fixes: 275876e208e2 ("regmap: Add the DT binding documentation for endianness") Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/regmap/regmap.txt59
1 files changed, 19 insertions, 40 deletions
diff --git a/Documentation/devicetree/bindings/regmap/regmap.txt b/Documentation/devicetree/bindings/regmap/regmap.txt
index e98a9652ccc8..0127be360fe8 100644
--- a/Documentation/devicetree/bindings/regmap/regmap.txt
+++ b/Documentation/devicetree/bindings/regmap/regmap.txt
@@ -1,50 +1,29 @@
-Device-Tree binding for regmap
-
-The endianness mode of CPU & Device scenarios:
-Index Device Endianness properties
----------------------------------------------------
-1 BE 'big-endian'
-2 LE 'little-endian'
-3 Native 'native-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.
+Devicetree binding for regmap
Optional properties:
-- {big,little,native}-endian: these are boolean properties, if absent
- then the implementation will choose a default based on the device
- being controlled. These properties are for register values and all
- the buffers only. Native endian means that the CPU and device have
- the same endianness.
-Examples:
-Scenario 1 : CPU in LE mode & device in LE mode.
-dev: dev@40031000 {
- compatible = "name";
- reg = <0x40031000 0x1000>;
- ...
-};
+ little-endian,
+ big-endian,
+ native-endian: See common-properties.txt for a definition
-Scenario 2 : CPU in LE mode & device in BE mode.
-dev: dev@40031000 {
- compatible = "name";
- reg = <0x40031000 0x1000>;
- ...
- big-endian;
-};
+Note:
+Regmap defaults to little-endian register access on MMIO based
+devices, this is by far the most common setting. On CPU
+architectures that typically run big-endian operating systems
+(e.g. PowerPC), registers can be defined as big-endian and must
+be marked that way in the devicetree.
-Scenario 3 : CPU in BE mode & device in BE mode.
-dev: dev@40031000 {
- compatible = "name";
- reg = <0x40031000 0x1000>;
- ...
-};
+On SoCs that can be operated in both big-endian and little-endian
+modes, with a single hardware switch controlling both the endianess
+of the CPU and a byteswap for MMIO registers (e.g. many Broadcom MIPS
+chips), "native-endian" is used to allow using the same device tree
+blob in both cases.
-Scenario 4 : CPU in BE mode & device in LE mode.
+Examples:
+Scenario 1 : a register set in big-endian mode.
dev: dev@40031000 {
- compatible = "name";
+ compatible = "syscon";
reg = <0x40031000 0x1000>;
+ big-endian;
...
- little-endian;
};