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>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Since v3:
 - Removed example.
 - Re-order this patch to be before adding compatible string to driver as per
   device tree binding patch rules.
 - Add Reviewed-by's.
Since v2:
 - Fixup (replace) patch to simply add opencores,gpio and add an example.
   (It was incorrect to specifying opencores,gpio with brcm,bcm6345-gpio
    as opencores,gpio is not the same hardware, its 8-bit vs 32-bit)
Since v1:
 - Fix schema to actually match the example.

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

diff --git a/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml b/Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
index ee5d5d25ae82..a8823ca65e78 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

--

2.51.0