dt-bindings: pinctrl: add schema for NXP S32 SoCs

Add DT schema for the pinctrl driver of NXP S32 SoC family.
Signed-off-by: Larisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: Ghennadi Procopciuc <Ghennadi.Procopciuc@oss.nxp.com>
Signed-off-by: Chester Lin <clin@suse.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230220023320.3499-2-clin@suse.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/nxp,s32g2-siul2-pinctrl.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2022 NXP
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/nxp,s32g2-siul2-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP S32G2 pin controller
+
+maintainers:
+  - Ghennadi Procopciuc <Ghennadi.Procopciuc@oss.nxp.com>
+  - Chester Lin <clin@suse.com>
+
+description: |
+  S32G2 pinmux is implemented in SIUL2 (System Integration Unit Lite2),
+  whose memory map is split into two regions:
+    SIUL2_0 @ 0x4009c000
+    SIUL2_1 @ 0x44010000
+
+  Every SIUL2 region has multiple register types, and here only MSCR and
+  IMCR registers need to be revealed for kernel to configure pinmux.
+
+  Please note that some register indexes are reserved in S32G2, such as
+  MSCR102-MSCR111, MSCR123-MSCR143, IMCR84-IMCR118 and IMCR398-IMCR429.
+
+properties:
+  compatible:
+    enum:
+      - nxp,s32g2-siul2-pinctrl
+
+  reg:
+    description: |
+      A list of MSCR/IMCR register regions to be reserved.
+      - MSCR (Multiplexed Signal Configuration Register)
+        An MSCR register can configure the associated pin as either a GPIO pin
+        or a function output pin depends on the selected signal source.
+      - IMCR (Input Multiplexed Signal Configuration Register)
+        An IMCR register can configure the associated pin as function input
+        pin depends on the selected signal source.
+    items:
+      - description: MSCR registers group 0 in SIUL2_0
+      - description: MSCR registers group 1 in SIUL2_1
+      - description: MSCR registers group 2 in SIUL2_1
+      - description: IMCR registers group 0 in SIUL2_0
+      - description: IMCR registers group 1 in SIUL2_1
+      - description: IMCR registers group 2 in SIUL2_1
+
+patternProperties:
+  '-pins$':
+    type: object
+    additionalProperties: false
+
+    patternProperties:
+      '-grp[0-9]$':
+        type: object
+        allOf:
+          - $ref: pinmux-node.yaml#
+          - $ref: pincfg-node.yaml#
+        description: |
+          Pinctrl node's client devices specify pin muxes using subnodes,
+          which in turn use the standard properties below.
+
+        properties:
+          bias-disable: true
+          bias-high-impedance: true
+          bias-pull-up: true
+          bias-pull-down: true
+          drive-open-drain: true
+          input-enable: true
+          output-enable: true
+
+          pinmux:
+            description: |
+              An integer array for representing pinmux configurations of
+              a device. Each integer consists of a PIN_ID and a 4-bit
+              selected signal source(SSS) as IOMUX setting, which is
+              calculated as: pinmux = (PIN_ID << 4 | SSS)
+
+          slew-rate:
+            description: Supported slew rate based on Fmax values (MHz)
+            enum: [83, 133, 150, 166, 208]
+
+        additionalProperties: false
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    pinctrl@4009c240 {
+        compatible = "nxp,s32g2-siul2-pinctrl";
+
+              /* MSCR0-MSCR101 registers on siul2_0 */
+        reg = <0x4009c240 0x198>,
+              /* MSCR112-MSCR122 registers on siul2_1 */
+              <0x44010400 0x2c>,
+              /* MSCR144-MSCR190 registers on siul2_1 */
+              <0x44010480 0xbc>,
+              /* IMCR0-IMCR83 registers on siul2_0 */
+              <0x4009ca40 0x150>,
+              /* IMCR119-IMCR397 registers on siul2_1 */
+              <0x44010c1c 0x45c>,
+              /* IMCR430-IMCR495 registers on siul2_1 */
+              <0x440110f8 0x108>;
+
+        llce-can0-pins {
+            llce-can0-grp0 {
+                pinmux = <0x2b0>;
+                input-enable;
+                slew-rate = <208>;
+            };
+
+            llce-can0-grp1 {
+                pinmux = <0x2c2>;
+                output-enable;
+                slew-rate = <208>;
+            };
+        };
+    };
+...