From: AKASHI Takahiro <takahiro.akashi@linaro.org>

Add a dt binding for the gpio-by-pinctrl driver.  The driver is used
for doing GPIO over the SCMI pinctrl protocol.  There are a few
mandatory properties such as gpio-ranges and ngpios, but it's not
mandatory to specify the pin-mux.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
 .../bindings/gpio/pin-control-gpio.yaml       | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/pin-control-gpio.yaml

diff --git a/Documentation/devicetree/bindings/gpio/pin-control-gpio.yaml b/Documentation/devicetree/bindings/gpio/pin-control-gpio.yaml
new file mode 100644
index 000000000000..81c68579df6e
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/pin-control-gpio.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/pin-control-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Pin control based generic GPIO controller
+
+description:
+  The pin control-based GPIO will facilitate a pin controller's ability
+  to drive electric lines high/low and other generic properties of a
+  pin controller to perform general-purpose one-bit binary I/O.
+
+maintainers:
+  - Dan Carpenter <dan.carpenter@linaro.og>
+
+properties:
+  compatible:
+    const: scmi-pinctrl-gpio
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-ranges: true
+
+  ngpios: true
+
+patternProperties:
+  "^.+-hog(-[0-9]+)?$":
+    type: object
+
+    required:
+      - gpio-hog
+
+required:
+  - compatible
+  - gpio-controller
+  - "#gpio-cells"
+  - gpio-ranges
+  - ngpios
+
+additionalProperties: true
+
+examples:
+  - |
+    gpio1 {
+        compatible = "scmi-pinctrl-gpio";
+        gpio-controller;
+        #gpio-cells = <2>;
+        ngpios = <10>;
+        gpio-ranges = <&scmi_pinctrl 0 8 4>,
+                      <&scmi_pinctrl 4 12 1>,
+                      <&scmi_pinctrl 5 15 1>,
+                      <&scmi_pinctrl 6 17 4>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&i2c2_pins>;
+    };
+
+    gpio2 {
+        compatible = "scmi-pinctrl-gpio";
+        gpio-controller;
+        #gpio-cells = <2>;
+        ngpios = <3>;
+        gpio-line-names = "gpio_5_17", "gpio_5_20", "gpio_5_22", "gpio_2_1";
+        gpio-ranges = <&scmi_pinctrl 0 30 4>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&keys_pins>;
+    };
-- 
2.51.0

On Wed, Mar 11, 2026 at 10:39:17PM +0300, Dan Carpenter wrote:
> From: AKASHI Takahiro <takahiro.akashi@linaro.org>
> 
> Add a dt binding for the gpio-by-pinctrl driver.  The driver is used
> for doing GPIO over the SCMI pinctrl protocol.  There are a few
> mandatory properties such as gpio-ranges and ngpios, but it's not
> mandatory to specify the pin-mux.
> 
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> ---
>  .../bindings/gpio/pin-control-gpio.yaml       | 70 +++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/pin-control-gpio.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/pin-control-gpio.yaml b/Documentation/devicetree/bindings/gpio/pin-control-gpio.yaml
> new file mode 100644
> index 000000000000..81c68579df6e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/pin-control-gpio.yaml
> @@ -0,0 +1,70 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/pin-control-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Pin control based generic GPIO controller
> +
> +description:
> +  The pin control-based GPIO will facilitate a pin controller's ability
> +  to drive electric lines high/low and other generic properties of a
> +  pin controller to perform general-purpose one-bit binary I/O.
> +
> +maintainers:
> +  - Dan Carpenter <dan.carpenter@linaro.og>
> +
> +properties:
> +  compatible:
> +    const: scmi-pinctrl-gpio
> +
> +  gpio-controller: true
> +
> +  "#gpio-cells":
> +    const: 2
> +
> +  gpio-ranges: true
> +
> +  ngpios: true
> +
> +patternProperties:
> +  "^.+-hog(-[0-9]+)?$":
> +    type: object
> +
> +    required:
> +      - gpio-hog
> +
> +required:
> +  - compatible
> +  - gpio-controller
> +  - "#gpio-cells"
> +  - gpio-ranges
> +  - ngpios
> +
> +additionalProperties: true

That's only valid for common (incomplete) schemas. It must be false.

> +
> +examples:
> +  - |
> +    gpio1 {
> +        compatible = "scmi-pinctrl-gpio";
> +        gpio-controller;
> +        #gpio-cells = <2>;
> +        ngpios = <10>;
> +        gpio-ranges = <&scmi_pinctrl 0 8 4>,
> +                      <&scmi_pinctrl 4 12 1>,
> +                      <&scmi_pinctrl 5 15 1>,
> +                      <&scmi_pinctrl 6 17 4>;
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&i2c2_pins>;
> +    };
> +
> +    gpio2 {
> +        compatible = "scmi-pinctrl-gpio";
> +        gpio-controller;
> +        #gpio-cells = <2>;
> +        ngpios = <3>;
> +        gpio-line-names = "gpio_5_17", "gpio_5_20", "gpio_5_22", "gpio_2_1";
> +        gpio-ranges = <&scmi_pinctrl 0 30 4>;
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&keys_pins>;
> +    };

I think 1 example is enough.

> -- 
> 2.51.0
>

On Wed, Mar 11, 2026 at 8:39 PM Dan Carpenter <dan.carpenter@linaro.org> wrote:

> From: AKASHI Takahiro <takahiro.akashi@linaro.org>
>
> Add a dt binding for the gpio-by-pinctrl driver.  The driver is used
> for doing GPIO over the SCMI pinctrl protocol.  There are a few
> mandatory properties such as gpio-ranges and ngpios, but it's not
> mandatory to specify the pin-mux.
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>

I think Takashi's original idea is sound now that we clarified
the level read/set semantics!
Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij