linux-kernel - Re: [PATCH v3 1/2] dt-bindings: input: Goodix GT7986U SPI HID Touchscreen

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Message-ID: <20241108161000.GA2270872-robh@kernel.org>
Date: Fri, 8 Nov 2024 10:10:00 -0600
From: Rob Herring <robh@...nel.org>
To: Charles Wang <charles.goodix@...il.com>
Cc: krzk@...nel.org, hbarnor@...omium.org, dianders@...omium.org,
	conor.dooley@...rochip.com, dmitry.torokhov@...il.com,
	jikos@...nel.org, bentiss@...nel.org, linux-input@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] dt-bindings: input: Goodix GT7986U SPI HID
 Touchscreen

On Fri, Nov 08, 2024 at 08:03:10PM +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.
> 
> NOTE: these bindings are distinct from the bindings used with the
> GT7986U when the chip is running I2C firmware. For some background,
> see discussion on the mailing lists in the thread:
> 
> https://lore.kernel.org/r/20241018020815.3098263-2-charles.goodix@gmail.com
> 
> Signed-off-by: Charles Wang <charles.goodix@...il.com>
> ---
>  .../bindings/input/goodix,gt7986u-spifw.yaml  | 75 +++++++++++++++++++
>  1 file changed, 75 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/goodix,gt7986u-spifw.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/goodix,gt7986u-spifw.yaml b/Documentation/devicetree/bindings/input/goodix,gt7986u-spifw.yaml
> new file mode 100644
> index 000000000..8105b9ce2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/goodix,gt7986u-spifw.yaml
> @@ -0,0 +1,75 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/goodix,gt7986u-spifw.yaml#
> +$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.

Move to next line.

> +  This touch controller reports data packaged according to the HID protocol
> +  over the SPI bus, but it is incompatible with Microsoft's HID-over-SPI protocol.
> +

If you want to maintain paragraphs you need '>' or '|' after 
'description:'. IIRC, it has to be '|' due to the "NOTE: " here:

> +  NOTE: these bindings are distinct from the bindings used with the
> +  GT7986U when the chip is running I2C firmware. This is because there's
> +  not a single device that talks over both I2C and SPI but rather
> +  distinct touchscreens that happen to be built with the same ASIC but
> +  that are distinct products running distinct firmware.
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - goodix,gt7986u-spifw
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  goodix,hid-report-addr:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      The register address for retrieving HID report data.
> +
> +  spi-max-frequency: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - reset-gpios
> +  - goodix,hid-report-addr
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      touchscreen@0 {
> +        compatible = "goodix,gt7986u-spifw";
> +        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
>