dt-bindings: pinctrl: convert fsl,imx7ulp-pinctrl.txt to yaml format

Convert fsl,imx7ulp-pinctrl.txt to yaml format.

Additional changes:
- remove label in example
- fsl,pin direct use hex value instead of macro because macro define in
dts local directory.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/20250417152158.3570936-1-Frank.Li@nxp.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: nxpfrankli

Documentation/devicetree/bindings/pinctrl/fsl,imx7ulp-iomuxc1.yaml

@@ -0,0 +1,99 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/fsl,imx7ulp-iomuxc1.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX7ULP IOMUX Controller
+
+description: |
+  i.MX 7ULP has three IOMUXC instances: IOMUXC0 for M4 ports, IOMUXC1 for A7
+  ports and IOMUXC DDR for DDR interface.
+
+  Note: This binding doc is only for the IOMUXC1 support in A7 Domain and it
+  only supports generic pin config.
+
+  Please refer to fsl,imx-pinctrl.txt in this directory for common binding
+  part and usage.
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    const: fsl,imx7ulp-iomuxc1
+
+  reg:
+    maxItems: 1
+
+patternProperties:
+  'grp$':
+    type: object
+    description:
+      Pinctrl node's client devices use subnodes for desired pin configuration.
+      Client device subnodes use below standard properties.
+
+    properties:
+      fsl,pins:
+        description:
+          Each entry consists of 5 integers which represents the mux
+          and config setting for one pin. The first 4 integers
+          <mux_conf_reg input_reg mux_mode input_val> are specified
+          using a PIN_FUNC_ID macro, which can be found in
+          imx7ulp-pinfunc.h in the device tree source folder.
+          The last integer CONFIG is the pad setting value like
+          pull-up on this pin.
+
+          Please refer to i.MX7ULP Reference Manual for detailed
+          CONFIG settings.
+        $ref: /schemas/types.yaml#/definitions/uint32-matrix
+        items:
+          items:
+            - description: |
+                "mux_conf_reg" indicates the offset of mux register.
+            - description: |
+                "input_reg" indicates the offset of select input register.
+            - description: |
+                "mux_mode" indicates the mux value to be applied.
+            - description: |
+                "input_val" indicates the select input value to be applied.
+            - description: |
+                CONFIG bits definition:
+                  PAD_CTL_OBE           (1 << 17)
+                  PAD_CTL_IBE           (1 << 16)
+                  PAD_CTL_LK            (1 << 16)
+                  PAD_CTL_DSE_HI        (1 << 6)
+                  PAD_CTL_DSE_STD       (0 << 6)
+                  PAD_CTL_ODE           (1 << 5)
+                  PAD_CTL_PUSH_PULL     (0 << 5)
+                  PAD_CTL_SRE_SLOW      (1 << 2)
+                  PAD_CTL_SRE_STD       (0 << 2)
+                  PAD_CTL_PE            (1 << 0)
+
+    required:
+      - fsl,pins
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: pinctrl.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    pinctrl@40ac0000 {
+        compatible = "fsl,imx7ulp-iomuxc1";
+        reg = <0x40ac0000 0x1000>;
+
+        lpuart4grp {
+            fsl,pins = <
+                0x000c 0x0248 0x4 0x1 0x1
+                0x0008 0x024c 0x4 0x1 0x1
+            >;
+        };
+    };