drivers: mfd: add new driver "mfd_adp5585"

Add mfd_adp5585 and gpio_adp5585 driver. This driver enables ADP5585
as an GPIO expander.
This chip is used as an GPIO expander on i.MX93 EVK. GPIO pinctrl,
read/write and interrupt is supported.
Note that ADP5585 has 2 GPIO banks with 5 pins each. The driver combines
two group into a 16-bit port. Index 0~4 correspond to R0~R4 lines, index
8~12 correspond to C0~C4 lines. Index 5~7 is reserved unavailable.

Signed-off-by: Chekhov Ma <chekhov.ma@nxp.com>

dts/bindings/gpio/adi,adp5585-gpio.yaml

@@ -0,0 +1,30 @@
+# Copyright 2024 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+description: ADP5585 GPIO Controller
+
+compatible: "adi,adp5585-gpio"
+
+include: gpio-controller.yaml
+
+properties:
+  "#gpio-cells":
+    const: 2
+
+  ngpios:
+    const: 13
+    description: |
+      Number of GPIOs available on port expander.
+
+  gpio-reserved-ranges:
+    required: true
+    const: [5, 3]
+    description: |
+      Ranges of GPIOs reserved unavailable on port expander.
+      The ADP5585 has 10 GPIO lines divided in 2 groups. GPIO number
+      5, 6, 7 is reserved. That's to say, GPIO R0~R4 occupy line
+      number 0~4, GPIO C0~C4 occupy line number 8~12.
+
+gpio-cells:
+  - pin
+  - flags

dts/bindings/mfd/adi,adp5585.yaml

@@ -0,0 +1,19 @@
+# Copyright 2024 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+description: Analog ADP5585 GPIO/keypad/PWM chip
+
+compatible: "adi,adp5585"
+
+include: i2c-device.yaml
+
+properties:
+  reset-gpios:
+    type: phandle-array
+    description: RESET pin
+
+  nint-gpios:
+    type: phandle-array
+    description: |
+      Connection for the NINT signal. This signal is active-low when
+      produced by adp5585 GPIO node.