| Message ID | 1398847921-9322-2-git-send-email-Li.Xiubo@freescale.com |
|---|---|
| State | Superseded, archived |
| Headers | show |
On Apr 30, 2014, at 1:52 AM, Xiubo Li <Li.Xiubo@freescale.com> wrote: > Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> > --- > .../devicetree/bindings/endianness/endianness.txt | 47 ++++++++++++++++++++++ > 1 file changed, 47 insertions(+) > create mode 100644 Documentation/devicetree/bindings/endianness/endianness.txt > > diff --git a/Documentation/devicetree/bindings/endianness/endianness.txt b/Documentation/devicetree/bindings/endianness/endianness.txt > new file mode 100644 > index 0000000..49458a1 > --- /dev/null > +++ b/Documentation/devicetree/bindings/endianness/endianness.txt > @@ -0,0 +1,47 @@ > +Device-Tree binding for device endianness > + > +The endianness mode of CPU & Device scenarios: > +Index CPU Device Endianess flag for DT bool property > +------------------------------------------------------------ > +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{,-*}: this is one boolean property. > + what is the {,-*} all about? > +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{,-*}; > +}; > -- > 1.8.4 >
diff --git a/Documentation/devicetree/bindings/endianness/endianness.txt b/Documentation/devicetree/bindings/endianness/endianness.txt new file mode 100644 index 0000000..49458a1 --- /dev/null +++ b/Documentation/devicetree/bindings/endianness/endianness.txt @@ -0,0 +1,47 @@ +Device-Tree binding for device endianness + +The endianness mode of CPU & Device scenarios: +Index CPU Device Endianess flag for DT bool property +------------------------------------------------------------ +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{,-*}: this is one boolean property. + +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{,-*}; +};
Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> --- .../devicetree/bindings/endianness/endianness.txt | 47 ++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 Documentation/devicetree/bindings/endianness/endianness.txt