[PATCH v2 1/2] dt-bindings: pinctrl: add schema for NXP S32 SoCs

[Chester Lin <clin@xxxxxxxx>]

Add DT schema for the pinctrl driver of NXP S32 SoC family.

Signed-off-by: Larisa Grigore <larisa.grigore@xxxxxxx>
Signed-off-by: Ghennadi Procopciuc <Ghennadi.Procopciuc@xxxxxxx>
Signed-off-by: Andrei Stefanescu <andrei.stefanescu@xxxxxxx>
Signed-off-by: Chester Lin <clin@xxxxxxxx>
---

Changes in v2:
- Remove the "nxp,pins" property since it has been moved into the driver.
- Add descriptions for reg entries.
- Refine the compatible name from "nxp,s32g-..." to "nxp,s32g2-...".
- Fix schema issues and revise the example.
- Fix the copyright format suggested by NXP.

 .../pinctrl/nxp,s32cc-siul2-pinctrl.yaml      | 125 ++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/nxp,s32cc-siul2-pinctrl.yaml

diff --git a/Documentation/devicetree/bindings/pinctrl/nxp,s32cc-siul2-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/nxp,s32cc-siul2-pinctrl.yaml
new file mode 100644
index 000000000000..2fc25a9362af
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/nxp,s32cc-siul2-pinctrl.yaml
@@ -0,0 +1,125 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2022 NXP
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/nxp,s32cc-siul2-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP S32 Common Chassis SIUL2 iomux controller
+
+maintainers:
+  - Ghennadi Procopciuc <Ghennadi.Procopciuc@xxxxxxx>
+  - Chester Lin <clin@xxxxxxxx>
+
+description: |
+  Core driver for the pin controller found on S32 Common Chassis SoC.
+
+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.
+    minItems: 5
+    items:
+      - description: MSCR registers group 0 managed by the SIUL2 controller 0
+      - description: MSCR registers group 1 managed by the SIUL2 controller 1
+      - description: MSCR registers group 2 managed by the SIUL2 controller 1
+      - description: IMCR registers group 0 managed by the SIUL2 controller 0
+      - description: IMCR registers group 1 managed by the SIUL2 controller 1
+      - description: IMCR registers group 2 managed by the SIUL2 controller 1
+
+required:
+  - compatible
+  - reg
+
+patternProperties:
+  '-pins$':
+    type: object
+    additionalProperties: false
+
+    patternProperties:
+      '-grp[0-9]$':
+        type: object
+        allOf:
+          - $ref: pinmux-node.yaml#
+          - $ref: pincfg-node.yaml#
+        unevaluatedProperties: false
+        description:
+          Pinctrl node's client devices specify pin muxes using subnodes,
+          which in turn use the standard properties.
+
+additionalProperties: false
+
+examples:
+  - |
+
+    /* Pins functions (SSS field) */
+    #define FUNC0  0
+    #define FUNC1  1
+    #define FUNC2  2
+    #define FUNC3  3
+    #define FUNC4  4
+    #define FUNC5  5
+    #define FUNC6  6
+    #define FUNC7  7
+
+    #define S32CC_PINMUX(PIN, FUNC) (((PIN) << 4) | (FUNC))
+
+    #define S32CC_SLEW_208MHZ  0
+    #define S32CC_SLEW_166MHZ  4
+    #define S32CC_SLEW_150MHZ  5
+    #define S32CC_SLEW_133MHZ  6
+    #define S32CC_SLEW_83MHZ   7
+
+    pinctrl@4009c240 {
+        compatible = "nxp,s32g2-siul2-pinctrl";
+
+        /*
+         * There are two SIUL2 controllers in S32G2:
+         *
+         *   siul2_0 @ 0x4009c000
+         *   siul2_1 @ 0x44010000
+         *
+         * Every SIUL2 controller has multiple register types, and here
+         * only MSCR and IMCR registers need to be revealed for kernel
+         * to configure pinmux. Please note that some indexes are reserved,
+         * such as MSCR102-MSCR111 in the following reg property.
+         */
+
+              /* 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 = <S32CC_PINMUX(43, FUNC0)>;
+                input-enable;
+                slew-rate = <S32CC_SLEW_208MHZ>;
+            };
+
+            llce-can0-grp1 {
+                pinmux = <S32CC_PINMUX(44, FUNC2)>;
+                output-enable;
+                slew-rate = <S32CC_SLEW_208MHZ>;
+            };
+        };
+    };
+...
-- 
2.37.3