linux-kernel - Re: [PATCH v5 2/2] dt-bindings: input: Goodix SPI HID Touchscreen

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Date: Wed, 19 Jun 2024 10:16:50 +0800
From: Charles Wang <charles.goodix@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: dmitry.torokhov@...il.com, dan.carpenter@...aro.org, robh@...nel.org,
	dianders@...omium.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 v5 2/2] dt-bindings: input: Goodix SPI HID Touchscreen

Hi Conor,

On Tue, Jun 18, 2024 at 06:43:18PM +0100, Conor Dooley wrote:
> On Tue, Jun 18, 2024 at 04:44:54PM +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        | 72 +++++++++++++++++++
> >  1 file changed, 72 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..25a26b4ce
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml
> > @@ -0,0 +1,72 @@
> > +# 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.
> 
> The description here isn't needed, it's obvious :)
>

Ack.

> > +  goodix,hid-report-addr:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: |
> 
> This | is not needed, there's no formatting to preserve.
> 
> Those are nits:
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> 

Thank you. If there is a next version, I will fix these.

Charles,

> 
> > +      The register address for retrieving HID report data.
> > +      This address is related to the device firmware and may
> > +      change after a firmware update.
> > +
> > +  spi-max-frequency: true
> > +
> > +additionalProperties: false
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - reset-gpios
> > +  - 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>;
> > +
> > +      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
> >