[PATCH v2 1/5] dt-bindings: Add compatible string opencores,gpio to gpio-mmio

[Stafford Horne]

In FPGA Development boards with GPIOs we use the opencores gpio verilog
rtl.  This is compatible with the gpio-mmio.  Add the compatible string
to allow as below.

Example:

        gpio0: gpio@91000000 {
                compatible = "opencores,gpio", "brcm,bcm6345-gpio";
                reg = <0x91000000 0x1>, <0x91000001 0x1>;
                reg-names = "dat", "dirout";
                gpio-controller;
                #gpio-cells = <2>;
                status = "okay";
        };

Link: https://opencores.org/projects/gpio
Signed-off-by: Stafford Horne <sho...@gmail.com>
---
Since v1:
 - Fix schema to actually match the example.

 .../devicetree/bindings/gpio/gpio-mmio.yaml       | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml 
b/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
index b4d55bf6a285..6fcf5fd2cb66 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
+++ b/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
@@ -18,11 +18,16 @@ description:
 
 properties:
   compatible:
-    enum:
-      - brcm,bcm6345-gpio
-      - ni,169445-nand-gpio
-      - wd,mbl-gpio # Western Digital MyBook Live memory-mapped GPIO controller
-      - intel,ixp4xx-expansion-bus-mmio-gpio
+    oneOf:
+      - enum:
+          - brcm,bcm6345-gpio
+          - ni,169445-nand-gpio
+          - wd,mbl-gpio # Western Digital MyBook Live memory-mapped GPIO 
controller
+          - intel,ixp4xx-expansion-bus-mmio-gpio
+      - items:
+          - enum:
+              - opencores,gpio
+          - const: brcm,bcm6345-gpio
 
   big-endian: true
 
-- 
2.51.0