linux-kernel - RE: [PATCHv5 2/2] dt/bindings: Add the DT binding documentation for endianness

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Date:	Tue, 15 Jul 2014 04:29:15 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"mark.rutland@....com" <mark.rutland@....com>
CC:	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCHv5 2/2] dt/bindings: Add the DT binding documentation for
 endianness

Hi,

Please ignore this V5 patch series.

Thanks,

BRs




> -----Original Message-----
> From: Xiubo Li [mailto:Li.Xiubo@...escale.com]
> Sent: Tuesday, July 15, 2014 12:18 PM
> To: broonie@...nel.org; mark.rutland@....com
> Cc: robh+dt@...nel.org; pawel.moll@....com; ijc+devicetree@...lion.org.uk;
> galak@...eaurora.org; gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devicetree@...r.kernel.org; Xiubo Li-B47053
> Subject: [PATCHv5 2/2] dt/bindings: 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@...escale.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@...31000 {
> +	      compatible = "name";
> +	      reg = <0x40031000 0x1000>;
> +	      ...
> +};
> +
> +Scenario 2 : CPU in LE mode & device in BE mode.
> +dev: dev@...31000 {
> +	      compatible = "name";
> +	      reg = <0x40031000 0x1000>;
> +	      ...
> +	      big-endian{,-*};
> +};
> +
> +Scenario 3 : CPU in BE mode & device in BE mode.
> +dev: dev@...31000 {
> +	      compatible = "name";
> +	      reg = <0x40031000 0x1000>;
> +	      ...
> +};
> +
> +Scenario 4 : CPU in BE mode & device in LE mode.
> +dev: dev@...31000 {
> +	      compatible = "name";
> +	      reg = <0x40031000 0x1000>;
> +	      ...
> +	      little-endian{,-*};
> +};
> --
> 1.8.5

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