linux-kernel - Re: [PATCHv6 2/2] dt/bindings: Add the DT binding documentation for endianness

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Date:	Tue, 15 Jul 2014 11:03:24 +0530
From:	Varka Bhadram <varkabhadram@...il.com>
To:	Xiubo Li <Li.Xiubo@...escale.com>, 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
Subject: Re: [PATCHv6 2/2] dt/bindings: Add the DT binding documentation for
 endianness

On 07/15/2014 09:53 AM, Xiubo Li wrote:
> 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          | 47 ++++++++++++++++++++++
>   1 file changed, 47 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..b494f8b
> --- /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.
> +

It would be more readable if its like 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 propperties are for
			values and all the buffers only.

> +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;
> +};


-- 
Regards,
Varka Bhadram.

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