dt-bindings: pinctrl: Add EcoNet EN7528 pin controller

Add the binding for the pin controller found on the EcoNet EN7528 MIPS
SoC. It shares the IP with the Airoha pin controllers, but its IOMUX and
pin configuration registers have a different layout, so it gets its own
compatible.

The CHIP SCU holding those registers is referenced by the airoha,chip-scu
phandle.

Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>

Documentation/devicetree/bindings/pinctrl/econet,en7528-pinctrl.yaml

@@ -0,0 +1,190 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/econet,en7528-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: EcoNet EN7528 Pin Controller
+
+maintainers:
+  - Lorenzo Bianconi <lorenzo@kernel.org>
+
+description:
+  The EcoNet EN7528 pin controller is used to control SoC pins. It shares the
+  IP with the Airoha pin controllers, but its IOMUX and pin configuration
+  registers have a different layout.
+
+properties:
+  compatible:
+    const: econet,en7528-pinctrl
+
+  airoha,chip-scu:
+    description: phandle to the chip SCU syscon
+    $ref: /schemas/types.yaml#/definitions/phandle
+
+  interrupts:
+    maxItems: 1
+
+  gpio-controller: true
+
+  '#gpio-cells':
+    const: 2
+
+  gpio-ranges:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 2
+
+patternProperties:
+  '-pins$':
+    type: object
+
+    patternProperties:
+      '^mux(-|$)':
+        type: object
+
+        description:
+          pinmux configuration nodes.
+
+        $ref: /schemas/pinctrl/pinmux-node.yaml
+
+        properties:
+          function:
+            description:
+              A string containing the name of the function to mux to the group.
+            enum: [gpio, jtag, pcie_reset, pcm, pcm_spi, phy1_led0,
+                   phy1_led1, phy2_led0, phy2_led1, phy3_led0, phy3_led1,
+                   phy4_led0, phy4_led1, pnand, pon, pwm, sipo, spi, uart]
+
+          groups:
+            description:
+              An array of strings. Each string contains the name of a group.
+            items:
+              enum: [pon, sipo, sipo_rclk, uart2, uart2_cts_rts, uart3,
+                     ejtag, pcm1, pcm2, spi_quad, spi_cs1, pcm_spi,
+                     pcm_spi_int, pcm_spi_rst, pcm_spi_cs1, pcm_spi_cs2,
+                     pcm_spi_cs3, pcm_spi_cs4, pcm_spi_cs5, pcm_spi_cs6,
+                     pcm_spi_cs7, pnand, gpio0, gpio1, gpio2, gpio3, gpio4,
+                     gpio5, gpio6, gpio7, gpio8, gpio9, gpio10, gpio11,
+                     gpio12, gpio13, gpio14, gpio15, gpio16, gpio17,
+                     gpio18, gpio19, gpio20, gpio21, gpio22, gpio23,
+                     gpio24, gpio25, gpio26, gpio27, gpio28, gpio29,
+                     gpio30, gpio31, gpio32, gpio33, gpio34, gpio35,
+                     gpio36, gpio37, gpio38, gpio39, gpio40, gpio41,
+                     pcie_reset0, pcie_reset1]
+
+        required:
+          - function
+          - groups
+
+        additionalProperties: false
+
+      '^conf(-|$)':
+        type: object
+
+        description:
+          pinconf configuration nodes.
+
+        $ref: /schemas/pinctrl/pincfg-node.yaml
+
+        properties:
+          pins:
+            description:
+              An array of strings. Each string contains the name of a pin.
+            items:
+              enum: [gpio0, gpio1, gpio2, gpio3, gpio4, gpio5, gpio6,
+                     gpio7, gpio8, gpio9, gpio10, gpio11, gpio12, gpio13,
+                     gpio14, gpio15, gpio16, gpio17, gpio18, gpio19,
+                     gpio20, gpio21, gpio22, gpio23, gpio24, gpio25,
+                     gpio26, gpio27, gpio28, gpio29, gpio30, gpio31,
+                     gpio32, gpio33, gpio34, gpio35, gpio36, gpio37,
+                     gpio38, gpio39, pcie_reset0, pcie_reset1, i2c_sda,
+                     i2c_scl, uart_txd, uart_rxd, spi_cs0, spi_clk,
+                     spi_mosi, spi_miso]
+            minItems: 1
+            maxItems: 50
+
+          bias-disable: true
+
+          bias-pull-up: true
+
+          bias-pull-down: true
+
+          input-enable: true
+
+          output-enable: true
+
+          output-low: true
+
+          output-high: true
+
+          drive-strength:
+            description:
+              Selects the drive strength for the pin, in mA.
+            enum: [2, 4]
+
+        required:
+          - pins
+
+        additionalProperties: false
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - airoha,chip-scu
+  - interrupts
+  - gpio-controller
+  - gpio-ranges
+  - "#gpio-cells"
+  - interrupt-controller
+  - "#interrupt-cells"
+
+allOf:
+  - $ref: pinctrl.yaml#
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/mips-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    pinctrl {
+      compatible = "econet,en7528-pinctrl";
+
+      airoha,chip-scu = <&chip_scu>;
+
+      interrupt-parent = <&gic>;
+      interrupts = <GIC_SHARED 10 IRQ_TYPE_LEVEL_HIGH>;
+
+      gpio-controller;
+      #gpio-cells = <2>;
+
+      interrupt-controller;
+      #interrupt-cells = <2>;
+
+      gpio-ranges = <&pinctrl 0 0 42>;
+
+      uart2-pins {
+        mux {
+          function = "uart";
+          groups = "uart2";
+        };
+
+        conf {
+          pins = "gpio28", "gpio29";
+          bias-pull-up;
+        };
+      };
+
+      pwm-pins {
+        mux {
+          function = "pwm";
+          groups = "gpio30";
+        };
+      };
+    };