Re: [PATCH 2/3] dt-bindings: touchscreen: Add HY46XX bindings

[Giulio Benetti <giulio.benetti@micronovasrl.com>]

Hello Rob, All,

Il 06/03/2021 20:41, Rob Herring ha scritto:
> On Fri, Mar 05, 2021 at 05:38:33PM +0100, Giulio Benetti wrote:
>> From: Giulio Benetti <giulio.benetti@micronovasrl.com>
>>
>> This adds device tree bindings for the Hycon HY46XX touchscreen series.
>>
>> Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
>> ---
>>   .../input/touchscreen/hycon,hy46xx.yaml       | 130 ++++++++++++++++++
>>   MAINTAINERS                                   |   6 +
>>   2 files changed, 136 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml b/Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml
>> new file mode 100644
>> index 000000000000..cddd5e5bae92
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml
>> @@ -0,0 +1,130 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/input/touchscreen/hycon-hy46xx.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: hyconon HY46XX series touchscreen controller Bindings
>> +
>> +description: |
>> +             There are 6 variants of the chip for various touch panel sizes and coverl len material
>> +              Glass: 0.3mm--4.0mm
>> +              PET/PMMA: 0.2mm--2.0mm
>> +               HY4613(B)-N048  < 6"
>> +               HY4614(B)-N068  7" .. 10.1"
>> +               HY4621-NS32  < 5"
>> +               HY4623-NS48  5.1" .. 7"
>> +              Glass: 0.3mm--8.0mm
>> +              PET/PMMA: 0.2mm--4.0mm
>> +               HY4633(B)-N048  < 6"
>> +               HY4635(B)-N048  < 7" .. 10.1"
>> +
>> +maintainers:
>> +  - Giulio Benetti <giulio.benetti@micronovasrl.com>
>> +
>> +allOf:
>> +  - $ref: touchscreen.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - hycon,hycon-hy4613
>> +      - hycon,hycon-hy4614
>> +      - hycon,hycon-hy4621
>> +      - hycon,hycon-hy4623
>> +      - hycon,hycon-hy4633
>> +      - hycon,hycon-hy4635
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  reset-gpios:
>> +    maxItems: 1
>> +
>> +  vcc-supply: true
>> +
>> +  threshold:
> 
> Needs a vendor prefix here and all the custom properties.

Sorry but I can't understand this ^^^, I've checked a lot of other yaml
files but couldn't find something related to this. Can you help me by
pointing me an example?

> 
> One of the touchscreen properties doesn't already address this?
> 
>> +    description: Allows setting the sensitivity in the range from 0 to 255.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    minimum: 0
>> +    maximum: 255
>> +
>> +  proximity-sensor-switch:
> 
> Why a switch rather than enable or disable?

I've changed its name into enable.

> 
>> +    description: Allows enabling or disabling the Proximity Sensor.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    minimum: 0
>> +    maximum: 1
> 
> Is this a hardware config or something a user would want to change at
> runtime? The latter shouldn't be in DT.

It's a hardware config that enable the 11th touch point, but I didn't
handle it inside the driver, so it's better that I remove it for the
moment.

> What does not present mean? Unless there is a need for keeping the
> default setting, then this could be boolean instead.

I've changed all "enable" to boolean and rely on default of the
controller.

Does this sound ok for you so I can send a v2 patchset?

Thank you
Best regards
-- 
Giulio Benetti
CTO

MICRONOVA SRL
Sede: Via A. Niedda 3 - 35010 Vigonza (PD)
Tel. 049/8931563 - Fax 049/8931346
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Iscritta al Reg. Imprese di Padova N. 02663420285
Numero R.E.A. 258642

> Same questions for the rest of the properties.
>> +
>> +  glove-enable:
>> +    description: Allows enabling or disabling glove setting.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    minimum: 0
>> +    maximum: 1
>> +
>> +  report-speed:
>> +    description: Allows setting the report speed(i.e 0x64 => 100Hz).
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    minimum: 0
>> +    maximum: 255
>> +
>> +  power-noise-enable:
>> +    description: Allows enabling or disabling power noise filter.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    minimum: 0
>> +    maximum: 1
>> +
>> +  filter-data:
>> +    description: Allows setting the filtering data before reporting touch
>> +                 in the range from 0 to 5.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    minimum: 0
>> +    maximum: 5
>> +
>> +  gain:
>> +    description: Allows setting the sensitivity distance in the range from 0 to 5.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    minimum: 0
>> +    maximum: 5
>> +
>> +  edge-offset:
>> +    description: Allows setting the edge compensation in the range from 0 to 16.
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    minimum: 0
>> +    maximum: 16
>> +
>> +  touchscreen-size-x: true
>> +  touchscreen-size-y: true
>> +  touchscreen-fuzz-x: true
>> +  touchscreen-fuzz-y: true
>> +  touchscreen-inverted-x: true
>> +  touchscreen-inverted-y: true
>> +  touchscreen-swapped-x-y: true
>> +  interrupt-controller: true
>> +
>> +additionalProperties: false
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/gpio/gpio.h>
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +    i2c {
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +      hycon-hy4633@1c {
>> +        compatible = "hycon,hy4633";
>> +        reg = <0x1c>;
>> +        interrupt-parent = <&gpio2>;
>> +        interrupts = <5 IRQ_TYPE_EDGE_FALLING>;
>> +        reset-gpios = <&gpio2 6 GPIO_ACTIVE_LOW>;
>> +      };
>> +    };
>> +
>> +...
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index d92f85ca831d..3f83daf6b2bf 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -8245,6 +8245,12 @@ S:	Maintained
>>   F:	mm/hwpoison-inject.c
>>   F:	mm/memory-failure.c
>>   
>> +HYCON HY46XX TOUCHSCREEN SUPPORT
>> +M:	Giulio Benetti <giulio.benetti@micronovasrl.com>
>> +L:	linux-input@vger.kernel.org
>> +S:	Maintained
>> +F:	Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml
>> +
>>   HYGON PROCESSOR SUPPORT
>>   M:	Pu Wen <puwen@hygon.cn>
>>   L:	linux-kernel@vger.kernel.org
>> -- 
>> 2.25.1
>>