[PATCH v8 1/5] 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, falling edge, or both.
There are four GPIO banks, each consisting of 32 pins.

Reviewed-by: Linus Walleij <linus.walleij at linaro.org>
Reviewed-by: Rob Herring (Arm) <robh at kernel.org>
Signed-off-by: Yixun Lan <dlan at gentoo.org>
---
hi Rob, I've kept your Review tag in this version, but want to
mention some changes here:
 - new clock property is added
 - add reset preperty, but make it optional
---
 .../devicetree/bindings/gpio/spacemit,k1-gpio.yaml | 96 ++++++++++++++++++++++
 1 file changed, 96 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 0000000000000000000000000000000000000000..ec0232e72c71221444972f0d3e0f391be05e4ef6
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/spacemit,k1-gpio.yaml
@@ -0,0 +1,96 @@
+# 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
+
+maintainers:
+  - Yixun Lan <dlan at gentoo.org>
+
+description:
+  The controller's registers are organized as sets of eight 32-bit
+  registers with each set of port controlling 32 pins.  A single
+  interrupt line is shared for all of the pins by the controller.
+
+properties:
+  $nodename:
+    pattern: "^gpio@[0-9a-f]+$"
+
+  compatible:
+    const: spacemit,k1-gpio
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: GPIO Core Clock
+      - description: GPIO Bus Clock
+
+  clock-names:
+    items:
+      - const: core
+      - const: bus
+
+  resets:
+    maxItems: 1
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 3
+    description:
+      The first two cells are the GPIO bank index and offset inside the bank,
+      the third cell should specify GPIO flag.
+
+  gpio-ranges: true
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  "#interrupt-cells":
+    const: 3
+    description:
+      The first two cells are the GPIO bank index and offset inside the bank,
+      the third cell should specify interrupt flag. The controller does not
+      support level interrupts, so flags of IRQ_TYPE_LEVEL_HIGH,
+      IRQ_TYPE_LEVEL_LOW should not be used.
+      Refer <dt-bindings/interrupt-controller/irq.h> for valid flags.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - gpio-controller
+  - "#gpio-cells"
+  - interrupts
+  - interrupt-controller
+  - "#interrupt-cells"
+  - gpio-ranges
+
+additionalProperties: false
+
+examples:
+  - |
+    gpio at d4019000 {
+      compatible = "spacemit,k1-gpio";
+      reg = <0xd4019000 0x800>;
+      clocks =<&ccu 9>, <&ccu 61>;
+      clock-names = "core", "bus";
+      gpio-controller;
+      #gpio-cells = <3>;
+      interrupts = <58>;
+      interrupt-controller;
+      interrupt-parent = <&plic>;
+      #interrupt-cells = <3>;
+      gpio-ranges = <&pinctrl 0 0 0 32>,
+                    <&pinctrl 1 0 32 32>,
+                    <&pinctrl 2 0 64 32>,
+                    <&pinctrl 3 0 96 32>;
+    };
+...

-- 
2.49.0