[PATCH 1/3] dt-bindings: gpio: spacemit: add support for K1 SoC

[Yixun Lan]

The GPIO controller of K1 support basic functions as input/output,
all pins can be used as interrupt which route to one IRQ line,
trigger type can be select between rising edge, failing edge, or both.
There are four GPIO banks, each consisting of 32 pins.

Signed-off-by: Yixun Lan <dlan at gentoo.org>
---
 .../devicetree/bindings/gpio/spacemit,k1-gpio.yaml | 95 ++++++++++++++++++++++
 1 file changed, 95 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpio/spacemit,k1-gpio.yaml b/Documentation/devicetree/bindings/gpio/spacemit,k1-gpio.yaml
new file mode 100644
index 0000000000000..db2e62fb452fd
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/spacemit,k1-gpio.yaml
@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/spacemit,k1-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT K1 GPIO controller
+
+description: >
+  The controller's registers are organized as sets of eight 32-bit
+  registers with each set controlling a bank of up to 32 pins.  A single
+  interrupt is shared for all of the banks handled by the controller.
+
+maintainers:
+  - Yixun Lan <dlan at gentoo.org>
+
+properties:
+  $nodename:
+    pattern: '^gpio@[0-9a-f]+$'
+
+  compatible:
+    items:
+      - const: spacemit,k1-gpio
+
+  reg:
+    maxItems: 1
+    description: >
+      Define the base and range of the I/O address space containing
+      the SpacemiT K1 GPIO controller registers
+
+  ranges: true
+
+  "#gpio-cells":
+    const: 2
+    description: >
+      The first cell is the pin number (within the controller's
+      pin space), and the second is used for the following:
+      bit[0]: polarity (0 for active-high, 1 for active-low)
+
+  gpio-controller: true
+
+  gpio-ranges: true
+
+  interrupts:
+    maxItems: 1
+    description:
+      The interrupt shared by all GPIO lines for this controller.
+
+  interrupt-names:
+    items:
+      - const: gpio_mux
+
+  "#interrupt-cells":
+    const: 2
+    description: |
+      The first cell is the GPIO number, the second should specify
+      flags.  The following subset of flags is supported:
+      - bits[3:0] trigger type flags (no level trigger type support)
+        1 = low-to-high edge triggered
+        2 = high-to-low edge triggered
+      Valid combinations are 1, 2, 3
+
+  interrupt-controller: true
+
+required:
+  - compatible
+  - reg
+  - gpio-controller
+  - '#gpio-cells'
+  - interrupts
+  - interrupt-names
+  - interrupt-controller
+  - '#interrupt-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        gpio at d4019000 {
+            compatible = "spacemit,k1-gpio";
+            reg = <0x0 0xd4019000 0x0 0x800>;
+            gpio-controller;
+            #gpio-cells = <2>;
+            interrupts = <58>;
+            interrupt-names = "gpio_mux";
+            interrupt-parent = <&plic>;
+            interrupt-controller;
+            #interrupt-cells = <2>;
+            gpio-ranges = <&pinctrl 0 0 128>;
+        };
+    };

-- 
2.45.2