linux-kernel - [RFC v2 5/5] dt-bindings: gpio: Add bindings for pinctrl based generic gpio driver

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Date:   Thu,  5 Oct 2023 11:58:43 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     sudeep.holla@....com, cristian.marussi@....com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linus.walleij@...aro.org
Cc:     Oleksii_Moisieiev@...m.com, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [RFC v2 5/5] dt-bindings: gpio: Add bindings for pinctrl based generic gpio driver

A dt binding for pin controller based generic gpio driver is defined in
this commit. One usable device is Arm's SCMI.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
---
RFC v2 (Oct 5, 2023)
* rename the binding to pin-control-gpio
* add the "description"
* remove nodename, hog properties, and a consumer example
RFC (Oct 2, 2023)
---
 .../bindings/gpio/pin-control-gpio.yaml       | 55 +++++++++++++++++++
 1 file changed, 55 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..bc935dbd7edb
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/pin-control-gpio.yaml
@@ -0,0 +1,55 @@
+# 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:
+  - AKASHI Takahiro <akashi.takahiro@...aro.org>
+
+properties:
+  compatible:
+    const: pin-control-gpio
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-ranges: true
+
+  gpio-ranges-group-names: true
+
+patternProperties:
+  "^.+-hog(-[0-9]+)?$":
+    type: object
+
+    required:
+      - gpio-hog
+
+required:
+  - compatible
+  - gpio-controller
+  - "#gpio-cells"
+  - gpio-ranges
+
+additionalProperties: false
+
+examples:
+  - |
+    gpio0: gpio@0 {
+        compatible = "pin-control-gpio";
+        gpio-controller;
+        #gpio-cells = <2>;
+        gpio-ranges = <&scmi_pinctrl 0 10 5>,
+                      <&scmi_pinctrl 5 0 0>;
+        gpio-ranges-group-names = "",
+                                  "pinmux_gpio";
+    };
-- 
2.34.1