This patch adds devicetree binding documentation for the
Arcx Anybus-S host.
Signed-off-by: Sven Van Asbroeck <svendev@xxxxxxxx>
---
.../bindings/fieldbus/arcx,anybuss-host.txt | 66 +++++++++++++++++++
1 file changed, 66 insertions(+)
create mode 100644 Documentation/devicetree/bindings/fieldbus/arcx,anybuss-host.txt
diff --git a/Documentation/devicetree/bindings/fieldbus/arcx,anybuss-host.txt b/Documentation/devicetree/bindings/fieldbus/arcx,anybuss-host.txt
new file mode 100644
index 000000000000..456587f288c1
--- /dev/null
+++ b/Documentation/devicetree/bindings/fieldbus/arcx,anybuss-host.txt
@@ -0,0 +1,66 @@
+* Arcx Anybus-S host
+
+This host communicates with the SoC over a parallel bus. It is
+expected that its Device Tree node is specified as the child of a node
+corresponding to the parallel bus used for communication.
+
+Required properties:
+--------------------
+
+ - compatible : The following string:
+ "arcx,anybuss-host"
+
+ - reg : bus memory area where the Anybus-S host dpram is located.
+
+ - interrupts : interrupt connected to the Anybus-S host interrupt line.
+ Generic interrupt client node bindings are described in
+ interrupt-controller/interrupts.txt
+
+ - resets : the reset line associated with the Anybus-S host.
+
+Optional: use of subnodes
+-------------------------
+
+The card connected to a host may need additional properties. These can be
+specified in subnodes to the host node.
+
+The subnodes are identified by the standard 'reg' property. Which information
+exactly can be specified depends on the bindings for the function driver
+for the subnode.
+
+Required host node properties when using subnodes:
+- #address-cells: should be one.
+- #size-cells: should be zero.
+
+Required subnode properties:
+- reg: Must contain the fieldbus type of the card this subnode describes.
+
+Example of usage:
+-----------------
+
+This example places the Anybus-S host on top of the i.MX WEIM parallel bus, see:
+Documentation/devicetree/bindings/bus/imx-weim.txt
+
+&weim {
+ anybus-host@0 {
+ compatible = "arcx,anybuss-host";
+ reg = <0 0x400000 0x800>;
+ interrupt-parent = <&gpio1>;
+ interrupts = <1 IRQ_TYPE_LEVEL_LOW>;
+ resets = <&anybus_bridge 0>;
+ /* fsl,weim-cs-timing is a i.MX WEIM bus specific property */
+ fsl,weim-cs-timing = <0x024400b1 0x00001010 0x20081100
+ 0x00000000 0xa0000240 0x00000000>;
+ /*
+ * optional subnode for a profinet card
+ * (fieldbus type = 0x0089)
+ */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ profinet@0 {
+ reg = <0x0089>;
+ /* profinet specific properties go here */
+ };
+ };
+
+};
--
2.17.1
