On Wed, Jun 27, 2018 at 09:26:02AM +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 for which
> a corresponding firmware file exists. It has most of the
> same properties, plus some more needed to operate the
> coprocessor.
>
> Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> ---
> .../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..50913ae685cc
> --- /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 =
> + "fsi-master-ast-2400-cf" for an AST2400 based system
> + or
> + "fsi-master-ast-2500-cf" for an AST2500 based system
<vendor>,<soc>-<block>
> +
> + - 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
So the gpio info is pased to the CF? Otherwise, what's the point of
having these in DT?
> + 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
> + - sram = <phandle>; : Reference to the SRAM node.
> + - cvic = <phandle>; : Reference to the CVIC node.
Vendor prefixes.
> + - fw-name = <string>; : The name used to construct
> the firmware
> + file name (cf-fsi-<name>.bin)
firmware-name is used in some other places (and is the full filename).
> + - fw-platform-sig = <value>; : A signature value that must
> match the one
> + contained in the firmware image. Known
> + values are listed in the firmware
> interface
> + file cf-fsi-fw.h
Vendor prefix unless you think this could be common.
> +Examples:
> +
> + fsi-master {
> + compatible = "fsi-master-gpio", "fsi-master";
Forget to update the example?
> + clock-gpios = <&gpio 0>;
> + data-gpios = <&gpio 1>;
> + enable-gpios = <&gpio 2>;
> + trans-gpios = <&gpio 3>;
> + mux-gpios = <&gpio 4>;
> + }
> --
> 2.17.1
>
> --
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