The brcm,nsp-gpio-a compatible used by the NSP GPIO controller was
only documented in the legacy text binding, so dtbs_check reported
'failed to match any schema' for the gpio@20 node present in every
bcm958625 and related board DTS.

Convert Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
to a YAML schema and drop the text binding. Keep the existing
required and optional properties (reg, #gpio-cells, gpio-controller,
ngpios, and the optional interrupt/gpio-ranges support), including
the generic pinconf child nodes with pin bias and drive-strength.

Assisted-by: LLM
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 .../bindings/pinctrl/brcm,nsp-gpio.txt        |  80 --------------
 .../bindings/pinctrl/brcm,nsp-gpio.yaml       | 101 ++++++++++++++++++
 2 files changed, 101 insertions(+), 80 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
 create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.yaml

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
deleted file mode 100644
index 0844168a6dd4..000000000000
--- a/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
+++ /dev/null
@@ -1,80 +0,0 @@
-Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
-
-Required properties:
-- compatible:
-    Must be "brcm,nsp-gpio-a"
-
-- reg:
-    Should contain the register physical address and length for each of
-    GPIO base, IO control registers
-
-- #gpio-cells:
-    Must be two. The first cell is the GPIO pin number (within the
-    controller's pin space) and the second cell is used for the following:
-    bit[0]: polarity (0 for active high and 1 for active low)
-
-- gpio-controller:
-    Specifies that the node is a GPIO controller
-
-- ngpios:
-    Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
-
-Optional properties:
-- interrupts:
-    Interrupt ID
-
-- interrupt-controller:
-    Specifies that the node is an interrupt controller
-
-- gpio-ranges:
-    Specifies the mapping between gpio controller and pin-controllers pins.
-    This requires 4 fields in cells defined as -
-    1. Phandle of pin-controller.
-    2. GPIO base pin offset.
-    3  Pin-control base pin offset.
-    4. number of gpio pins which are linearly mapped from pin base.
-
-Supported generic PINCONF properties in child nodes:
-- pins:
-    The list of pins (within the controller's own pin space) that properties
-    in the node apply to. Pin names are "gpio-<pin>"
-
-- bias-disable:
-    Disable pin bias
-
-- bias-pull-up:
-    Enable internal pull up resistor
-
-- bias-pull-down:
-    Enable internal pull down resistor
-
-- drive-strength:
-    Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
-
-Example:
-
-	gpioa: gpio@18000020 {
-		compatible = "brcm,nsp-gpio-a";
-		reg = <0x18000020 0x100>,
-		      <0x1803f1c4 0x1c>;
-		#gpio-cells = <2>;
-		gpio-controller;
-		ngpios = <32>;
-		gpio-ranges = <&pinctrl 0 0 31>;
-		interrupt-controller;
-		interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
-
-		/* Hog a few default settings */
-		pinctrl-names = "default";
-		pinctrl-0 = <&led>;
-		led: led {
-			pins = "gpio-1";
-			bias-pull-up;
-		};
-
-		pwr: pwr {
-			gpio-hog;
-			gpios = <3 1>;
-			output-high;
-		};
-	};
diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.yaml b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.yaml
new file mode 100644
index 000000000000..9eb4a2a1f02f
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.yaml
@@ -0,0 +1,101 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/brcm,nsp-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom Northstar Plus (NSP) GPIO/PINCONF Controller
+
+maintainers:
+  - Ray Jui <rjui@broadcom.com>
+  - Scott Branden <sbranden@broadcom.com>
+
+properties:
+  compatible:
+    const: brcm,nsp-gpio-a
+
+  reg:
+    items:
+      - description: GPIO base registers
+      - description: IO control registers
+
+  "#gpio-cells":
+    const: 2
+    description: |
+      The first cell is the GPIO pin number (within the controller's pin
+      space) and the second cell is used for the following:
+      bit[0]: polarity (0 for active high and 1 for active low)
+
+  gpio-controller: true
+
+  ngpios:
+    description: Number of GPIOs supported (58x25 supports 32 and 58x23 supports 24)
+    maximum: 32
+
+  interrupts:
+    maxItems: 1
+
+  "#interrupt-cells":
+    const: 2
+
+  interrupt-controller: true
+
+  gpio-ranges: true
+
+required:
+  - compatible
+  - reg
+  - "#gpio-cells"
+  - gpio-controller
+  - ngpios
+
+patternProperties:
+  '-pins$':
+    type: object
+    additionalProperties:
+      description: Pin configuration child nodes.
+      allOf:
+        - $ref: pincfg-node.yaml#
+        - $ref: pinmux-node.yaml#
+      additionalProperties: false
+
+      properties:
+        pins:
+          items:
+            pattern: '^gpio-'
+
+        bias-disable: true
+        bias-pull-up: true
+        bias-pull-down: true
+
+        drive-strength:
+          enum: [ 2, 4, 6, 8, 10, 12, 14, 16 ]
+
+      required:
+        - pins
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    gpio@18000020 {
+        compatible = "brcm,nsp-gpio-a";
+        reg = <0x18000020 0x100>,
+              <0x1803f1c4 0x1c>;
+        #gpio-cells = <2>;
+        gpio-controller;
+        ngpios = <32>;
+        gpio-ranges = <&pinctrl 0 0 31>;
+        interrupt-controller;
+        #interrupt-cells = <2>;
+        interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+
+        led-pins {
+            led {
+                pins = "gpio-1";
+                bias-pull-up;
+            };
+        };
+    };
-- 
2.55.0