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 <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..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
+
+ - 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
+ - sram = <phandle>; : Reference to the SRAM node.
+ - cvic = <phandle>; : Reference to the CVIC node.
+ - fw-name = <string>; : The name used to construct the firmware
+ file name (cf-fsi-<name>.bin)
+ - 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
+Examples:
+
+ fsi-master {
+ compatible = "fsi-master-gpio", "fsi-master";
+ 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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