On Mon, 2018-07-16 at 09:33 -0600, Rob Herring wrote:
> 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
Ah right, thanks. The next spin will have that fixed and will go into
the fsi tree.
> Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
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