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

Stafford Horne
2026-01-11T16:46:55Z

On Sun, Jan 11, 2026 at 11:18:42AM +0100, Krzysztof Kozlowski wrote:
> On Fri, Jan 09, 2026 at 01:43:53PM +0000, Stafford Horne wrote:
> > 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.
>
> Simplify? You completely changed the meaning of binding here - now
> device is not compatible.
>
> I don't know which one is correct, but your changelog must explain why
> now devices are not compatible but they were before.

Hello,

Did you miss the 1/6 patch in this series? We add the compatible string to the
driver there before we add it here.

Sorry, I thought the series and the over letter would be enough to understand
what I meant by the "Fixup" description here.

> > 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 {
>
> Please do not grow the examples if they are exactly the same as other.

I figured this is a new compatible string with a different set of 8 bit
registers so having this example would be beneficial.

> > + compatible = "opencores,gpio";
> > + reg = <0x91000000 0x1>, <0x91000001 0x1>;
> > + reg-names = "dat", "dirout";
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > + };
> > --
> > 2.51.0
> >