[PATCH 03/11] dt-bindings: gpio: Add Cortina Systems CS7542 GPIO controller

[Fil Dunsky via B4 Relay <devnull+filipp.dunsky.gmail.com@kernel.org>]

From: Fil Dunsky <filipp.dunsky@gmail.com>

The Cortina Systems CS75xx SoCs have five banks of 32 GPIO lines. Each
pin is shared between a GPIO line and a peripheral function, selected by
the bank's GPIO_MUX register in the global control block, which is
described as the second register region of the bank.

Signed-off-by: Fil Dunsky <filipp.dunsky@gmail.com>
---
 .../bindings/gpio/cortina,cs7542-gpio.yaml         | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpio/cortina,cs7542-gpio.yaml b/Documentation/devicetree/bindings/gpio/cortina,cs7542-gpio.yaml
new file mode 100644
index 000000000..b54421d65
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/cortina,cs7542-gpio.yaml
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/cortina,cs7542-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cortina Systems CS7542 GPIO controller
+
+maintainers:
+  - Fil Dunsky <filipp.dunsky@gmail.com>
+
+description:
+  The Cortina Systems CS75xx (Goldengate G2) SoCs have five banks of 32
+  GPIO lines, each with its own interrupt. Every pin is shared between a
+  GPIO line and a peripheral function; the choice is made per pin in the
+  GPIO_MUX register of the bank, which is part of the global control
+  block.
+
+properties:
+  compatible:
+    const: cortina,cs7542-gpio
+
+  reg:
+    items:
+      - description: GPIO bank registers
+      - description: GPIO_MUX register of the bank
+
+  interrupts:
+    maxItems: 1
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-line-names:
+    maxItems: 32
+
+  gpio-reserved-ranges: true
+
+  interrupt-controller: true
+
+  "#interrupt-cells":
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - gpio-controller
+  - "#gpio-cells"
+  - interrupt-controller
+  - "#interrupt-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    gpio@f00701f0 {
+        compatible = "cortina,cs7542-gpio";
+        reg = <0xf00701f0 0x20>, <0xf0000020 0x4>;
+        interrupt-parent = <&intc>;
+        interrupts = <7>;
+        gpio-controller;
+        #gpio-cells = <2>;
+        interrupt-controller;
+        #interrupt-cells = <2>;
+    };

-- 
2.53.0