linux-kernel - Re: [PATCH v2 1/4] dt-bindings: input: Add Himax HX83102J touchscreen

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Message-ID: <20240402-doable-routine-8e8cb4f07ffb@spud>
Date: Tue, 2 Apr 2024 19:09:32 +0100
From: Conor Dooley <conor@...nel.org>
To: Allen_Lin <allencl_lin@...mail.com>
Cc: dmitry.torokhov@...il.com, robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, jikos@...nel.org,
	benjamin.tissoires@...hat.com, linux-input@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: input: Add Himax HX83102J touchscreen

On Tue, Apr 02, 2024 at 06:49:27PM +0800, Allen_Lin wrote:
> Add the HX83102j touchscreen device tree bindings documents.
> HX83102j is a Himax TDDI touchscreen controller.
> It's power sequence should be bound with a lcm driver, thus it
> needs to be a panel follower. Others are the same as normal SPI
> touchscreen controller.
> 
> Signed-off-by: Allen_Lin <allencl_lin@...mail.com>
> ---
>  .../input/touchscreen/himax,hx83102j.yaml     | 100 ++++++++++++++++++
>  MAINTAINERS                                   |   6 ++
>  2 files changed, 106 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/himax,hx83102j.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/himax,hx83102j.yaml b/Documentation/devicetree/bindings/input/touchscreen/himax,hx83102j.yaml
> new file mode 100644
> index 000000000000..fe79129f704a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/himax,hx83102j.yaml
> @@ -0,0 +1,100 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/himax,hx83102j.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Himax hx83102j touchscreen
> +
> +maintainers:
> +  - Allen Lin <allencl_lin@...mail.com>
> +
> +description:
> +  This Himax hx83102j touchscreen uses the spi protocol.
> +
> +allOf:
> +  - $ref: /schemas/input/touchscreen/touchscreen.yaml#
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    const: himax,hx83102j
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  vccd-supply:
> +    description: A phandle for the regualtor supplying IO power.

nit: regulator

> + 
> +  vsn-supply:
> +    description: Negative supply regulator.
> + 
> +  vsp-supply:
> +    description: Positive supply regulator.

Cool, thanks for adding these.

> +
> +  ddreset-gpios:
> +    description: A phandle of gpio for display reset controlled by the LCD driver.
> +      This is the master reset, if this reset is triggered, the TP reset will 
> +      also be triggered.
> +  
> +  spi-cpha: true
> +
> +  spi-cpol: true
> +
> +  spi-max-frequency: true
> +
> +  panel: true
> +
> +  himax,firmware-name:

firmware-name is a standard property, you don't need to vendor prefix it.

> +    $ref: /schemas/types.yaml#/definitions/string
> +    description:
> +      Specify the file name for firmware loading.
> +
> +  himax,pid:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      PID for HID device, used to validate firmware.

Why do you need this _and_ firmware-name? You should be able to trust
the firmware that the dt has told you to use, no?

Cheers,
Conor.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - reset-gpios
> +  - panel
> +  - vccd-supply
> +  - vsn-supply
> +  - vsp-supply
> +  - ddreset-gpios
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      ap_ts: touchscreen@0 {
> +        compatible = "himax,hx83102j";
> +        reg = <0>;
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&touch_int0 &touch_reset>;
> +        reset-gpios = <&gpio1 8 GPIO_ACTIVE_LOW>;
> +        spi-cpha;
> +        spi-cpol;
> +        interrupt-parent = <&gpio1>;
> +        interrupts = <7 IRQ_TYPE_LEVEL_LOW>;
> +        panel = <&panel>;
> +        vccd-supply = <&regulator>;
> +        vsn-supply = <&regulator>;
> +        vsp-supply = <&regulator>;
> +        ddreset-gpios = <&gpio1>;
> +      };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 43b39956694a..aa51c60fd66d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -9669,6 +9669,12 @@ L:	linux-kernel@...r.kernel.org
>  S:	Maintained
>  F:	drivers/misc/hisi_hikey_usb.c
>  
> +HIMAX HID HX83102J TOUCHSCREEN
> +M:	Allen Lin <allencl_lin@...mail.com>
> +L:	linux-input@...r.kernel.org
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/input/touchscreen/himax,hx83102j.yaml
> +
>  HIMAX HX83112B TOUCHSCREEN SUPPORT
>  M:	Job Noorman <job@...rman.info>
>  L:	linux-input@...r.kernel.org
> -- 
> 2.34.1
> 

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