[PATCH v3 2/6] dt-bindings: gpio-mmio: Add opencores GPIO

[Stafford Horne <shorne@gmail.com>]

Add a device tree binding for the opencores GPIO controller.

On FPGA Development boards with GPIOs the OpenRISC architecture uses the
opencores gpio verilog rtl which is compatible with the MMIO GPIO driver.

Link: https://opencores.org/projects/gpio
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
Since v2:
 - Fixup patch to simply add opencores,gpio and add an example.
Since v1:
 - Fix schema to actually match the example.

 Documentation/devicetree/bindings/gpio/gpio-mmio.yaml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml b/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
index ee5d5d25ae82..d44edc181e0a 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
+++ b/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
@@ -23,6 +23,7 @@ properties:
       - ni,169445-nand-gpio
       - wd,mbl-gpio # Western Digital MyBook Live memory-mapped GPIO controller
       - intel,ixp4xx-expansion-bus-mmio-gpio
+      - opencores,gpio
 
   big-endian: true
 
@@ -160,3 +161,11 @@ examples:
             intel,ixp4xx-eb-write-enable = <1>;
         };
     };
+
+    gpio@91000000 {
+        compatible = "opencores,gpio";
+        reg = <0x91000000 0x1>, <0x91000001 0x1>;
+        reg-names = "dat", "dirout";
+        gpio-controller;
+        #gpio-cells = <2>;
+    };
-- 
2.51.0