Re: [PATCH v2 1/3] dt-bindings: gpio: spacemit: add support for K1 SoC

[Conor Dooley <conor@kernel.org>]

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On Thu, Dec 19, 2024 at 03:17:43PM +0800, Yixun Lan wrote:
> 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@gentoo.org>
> ---
>  .../devicetree/bindings/gpio/spacemit,k1-gpio.yaml | 75 ++++++++++++++++++++++
>  1 file changed, 75 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..3d3d0b3bf2c144ed57b717bee50064949e26f087
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/spacemit,k1-gpio.yaml
> @@ -0,0 +1,75 @@
> +# 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@gentoo.org>
> +
> +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.
> +
> +properties:
> +  compatible:
> +    const: spacemit,k1-gpio
> +
> +  reg:
> +    maxItems: 1
> +
> +  ranges: true

What do you need this for?

> +
> +  "#gpio-cells":
> +    const: 2
> +
> +  gpio-controller: true
> +
> +  gpio-ranges: true
> +
> +  interrupts:
> +    maxItems: 1
> +    description:
> +      The interrupt shared by all GPIO lines for this controller.
> +
> +  interrupt-names: true

Not that a name is valuable when you only have one interrupt, but if you
don't specify what the name is, you cannot interrupt-names!

Cheers,
Conor.

> +
> +  "#interrupt-cells":
> +    const: 2
> +    description:
> +      The first cell is the GPIO number, the second should specify interrupt
> +      flag. The controller does not support level interrupts, flags of
> +      IRQ_TYPE_LEVEL_HIGH, IRQ_TYPE_LEVEL_LOW should not be used.
> +      Refer <dt-bindings/interrupt-controller/irq.h> for valid flags.
> +
> +  interrupt-controller: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - gpio-controller
> +  - "#gpio-cells"
> +  - interrupts
> +  - interrupt-names
> +  - interrupt-controller
> +  - "#interrupt-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    gpio@d4019000 {
> +        compatible = "spacemit,k1-gpio";
> +        reg = <0xd4019000 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>;
> +    };
> 
> -- 
> 2.47.0
> 

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