On Thu, Jul 12, 2018 at 01:48:43PM +1000, Benjamin Herrenschmidt wrote:
> This isn't per-se a real device, it's a pseudo-device that
> represents the use of the Aspeed built-in ColdFire to
> implement the FSI protocol by bitbanging the GPIOs instead
> of doing it from the ARM core.
>
> Thus it's a drop-in replacement for the existing
> fsi-master-gpio pseudo-device for use on systems based
> on the Aspeed chips. It has most of the same properties,
> plus some more needed to operate the coprocessor.
>
> Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> ---
> .../bindings/fsi/fsi-master-ast-cf.txt | 36 +++++++++++++++++++
> 1 file changed, 36 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/fsi/fsi-master-ast-cf.txt
>
> diff --git a/Documentation/devicetree/bindings/fsi/fsi-master-ast-cf.txt b/Documentation/devicetree/bindings/fsi/fsi-master-ast-cf.txt
> new file mode 100644
> index 000000000000..431bf8a423ce
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fsi/fsi-master-ast-cf.txt
> @@ -0,0 +1,36 @@
> +Device-tree bindings for ColdFire offloaded gpio-based FSI master driver
> +------------------------------------------------------------------------
> +
> +Required properties:
> + - compatible =
> + "aspeed,ast2400-cf-fsi-master" for an AST2400 based system
> + or
> + "aspeed,ast2500-cf-fsi-master" for an AST2500 based system
> +
> + - clock-gpios = <gpio-descriptor>; : GPIO for FSI clock
> + - data-gpios = <gpio-descriptor>; : GPIO for FSI data signal
> + - enable-gpios = <gpio-descriptor>; : GPIO for enable signal
> + - trans-gpios = <gpio-descriptor>; : GPIO for voltage translator enable
> + - mux-gpios = <gpio-descriptor>; : GPIO for pin multiplexing with other
> + functions (eg, external FSI masters)
> + - memory-region = <phandle>; : Reference to the reserved memory for
> + the ColdFire. Must be 2M aligned on
> + AST2400 and 1M aligned on AST2500
> + - aspeed,sram = <phandle>; : Reference to the SRAM node.
> + - aspeed,cvic = <phandle>; : Reference to the CVIC node.
> +
> +Examples:
> +
> + fsi-master {
> + compatible = "aspeed,ast2500-cf-fsi-master", "fsi-master";
> +
> + clock-gpios = <&gpio 0>;
> + data-gpios = <&gpio 1>;
> + enable-gpios = <&gpio 2>;
> + trans-gpios = <&gpio 3>;
> + mux-gpios = <&gpio 4>;
> +
> + memory-region = <&coldfire_memory>;
> + sram = <&sram>;
> + cvic = <&cvic>;
Need to update the example. With that,
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
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