linux-kernel - Re: [PATCH v3 1/5] dt-bindings: fsi: Document binding for the fsi-master-ast-cf "device"

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Date:   Mon, 16 Jul 2018 09:33:08 -0600
From:   Rob Herring <robh@...nel.org>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     linux-aspeed@...ts.ozlabs.org, devicetree@...r.kernel.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Andrew Jeffery <andrew@...id.au>,
        Joel Stanley <joel@....id.au>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/5] dt-bindings: fsi: Document binding for the
 fsi-master-ast-cf "device"

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@...nel.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..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@...nel.org>