linux-kernel - Re: [PATCH v4 2/2] dt-bindings: input: Goodix SPI HID Touchscreen

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Message-ID: <20240614-renewably-snowless-861ca2ab9c93@spud>
Date: Fri, 14 Jun 2024 16:26:22 +0100
From: Conor Dooley <conor@...nel.org>
To: Charles Wang <charles.goodix@...il.com>
Cc: dmitry.torokhov@...il.com, dan.carpenter@...aro.org,
	dianders@...omium.org, robh@...nel.org, krzk+dt@...nel.org,
	jikos@...nel.org, bentiss@...nel.org, hbarnor@...omium.org,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] dt-bindings: input: Goodix SPI HID Touchscreen

On Fri, Jun 14, 2024 at 08:15:38PM +0800, Charles Wang wrote:
> The Goodix GT7986U touch controller report touch data according to the
> HID protocol through the SPI bus. However, it is incompatible with
> Microsoft's HID-over-SPI protocol.
> 
> Signed-off-by: Charles Wang <charles.goodix@...il.com>
> ---
>  .../bindings/input/goodix,gt7986u.yaml        | 65 +++++++++++++++++++
>  1 file changed, 65 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/goodix,gt7986u.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml b/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml
> new file mode 100644
> index 000000000..1c518d03b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml
> @@ -0,0 +1,65 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/goodix,gt7986u.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: GOODIX GT7986U SPI HID Touchscreen
> +
> +maintainers:
> +  - Charles Wang <charles.goodix@...il.com>
> +
> +description:
> +  Supports the Goodix GT7986U touchscreen.
> +  This touch controller reports data packaged according to the HID protocol,
> +  but is incompatible with Microsoft's HID-over-SPI protocol.
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - goodix,gt7986u
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    maxItems: 1
> +    description: reset gpio the chip is connected to.
> +
> +  goodix,hid-report-addr:
> +    description: the register address for retrieving HID report data.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +
> +additionalProperties: false

unevaluatedProperties: false.

Please test your binding w/ dt_binding_check.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - goodix,hid-report-addr
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +    spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      num-cs = <1>;
> +      cs-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;

cs-gpios shouldn't be needed for a basic example.

Blank line here before the child node please.

Thanks,
Conor.

> +      touchscreen@0 {
> +        compatible = "goodix,gt7986u";
> +        reg = <0>;
> +        interrupt-parent = <&gpio>;
> +        interrupts = <25 IRQ_TYPE_LEVEL_LOW>;
> +        reset-gpios = <&gpio1 1 GPIO_ACTIVE_LOW>;
> +        spi-max-frequency = <10000000>;
> +        goodix,hid-report-addr = <0x22c8c>;
> +      };
> +    };
> -- 
> 2.43.0
> 
> 

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