Re: [RFC 3/6] dt/bindings: Add bindings for Tegra20/30 NOR bus driver

[Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On Tue, Jul 19, 2016 at 03:36:34PM +0200, Mirza Krak wrote:
> From: Mirza Krak <mirza.krak-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> 
> Document the devicetree bindings for NOR bus driver found on Tegra20 and
> Tegra30 SOCs
> 
> Signed-off-by: Mirza Krak <mirza.krak-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>  .../devicetree/bindings/bus/nvidia,tegra20-nor.txt | 73 ++++++++++++++++++++++
>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/bus/nvidia,tegra20-nor.txt
> 
> diff --git a/Documentation/devicetree/bindings/bus/nvidia,tegra20-nor.txt b/Documentation/devicetree/bindings/bus/nvidia,tegra20-nor.txt
> new file mode 100644
> index 0000000..9ee4a66
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/nvidia,tegra20-nor.txt
> @@ -0,0 +1,73 @@
> +Device tree bindings for NVIDIA Tegra20/30 NOR Bus
> +
> +The NOR controller supports a number of memory types, including synchronous NOR,
> +asynchronous NOR, and other flash memories with similar interfaces, such as
> +MuxOneNAND. One could also connect high speed devices like FPGAs, DSPs,
> +CAN chips, Wi-Fi chips etc.
> +
> +The actual devices are instantiated from the child nodes of a NOR node.
> +
> +Required properties:
> +
> + - compatible: should be "nvidia,tegra20-nor", "nvidia,tegra30-nor"
> + - reg: Should contain NOR controller registers location and length.
> + - clocks: Must contain one entry, for the module clock.
> +   See ../clocks/clock-bindings.txt for details.
> + - resets : Must contain an entry for each entry in reset-names.
> +   See ../reset/reset.txt for details.
> + - reset-names : Must include the following entries:
> +  - nor
> + - #address-cells: Must be set to 2 to allow memory address translation
> + - #size-cells:	Must be set to 1 to allow CS address passing
> + - ranges: Must be set up to reflect the memory layout with four integer
> + 		values for each chip-select line in use.
> + - nvidia,config: This property represents the SNOR_CONFIG_0 register.
> +
> +Note that the NOR controller does not have any internal chip-select address
> +decoding and if you want to access multiple devices external chip-select
> +decoding must be provided.

Then what are the 2 chip selects in ranges?

Rob