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Date: Sun, 11 Apr 2021 13:37:07 +0200
From: Giulio Benetti <giulio.benetti@...ettiengineering.com>
To: Rob Herring <robh@...nel.org>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>,
Jonathan Neuschäfer <j.neuschaefer@....net>,
Henrik Rydberg <rydberg@...math.org>,
linux-input@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/3] dt-bindings: touchscreen: Add HY46XX bindings
On 4/8/21 10:21 PM, Rob Herring wrote:
> On Wed, Apr 07, 2021 at 07:49:08PM +0200, Giulio Benetti wrote:
>> This adds device tree bindings for the Hycon HY46XX touchscreen series.
>>
>> Signed-off-by: Giulio Benetti <giulio.benetti@...ettiengineering.com>
>> ---
>> V1->V2:
>> As suggested by Rob Herring:
>> * fixed $id: address
>> * added "hycon," in front of every custom property
>> * changed all possible property to boolean type
>> * removed proximity-sensor-switch property since it's not handled in driver
>> V2->V3:
>> As suggested by Jonathan Neuschäfer:
>> * fixed some typo
>> * fixed description indentation
>> * improved boolean properties descriptions
>> * improved hycon,report-speed description
>> V3->V4:
>> * fixed binding compatible string in example as suggested by Jonathan Neuschäfer
>> ---
>> .../input/touchscreen/hycon,hy46xx.yaml | 120 ++++++++++++++++++
>> MAINTAINERS | 6 +
>> 2 files changed, 126 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml b/Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml
>> new file mode 100644
>> index 000000000000..8860613a12ad
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml
>> @@ -0,0 +1,120 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/input/touchscreen/hycon,hy46xx.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Hycon HY46XX series touchscreen controller bindings
>> +
>> +description: |
>> + There are 6 variants of the chip for various touch panel sizes and cover lens 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@...ettiengineering.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
>
> As suggested earlier, drop the 2nd 'hycon'.
Ok
>> +
>> + reg:
>> + maxItems: 1
>> +
>> + interrupts:
>> + maxItems: 1
>> +
>> + reset-gpios:
>> + maxItems: 1
>> +
>> + vcc-supply: true
>> +
>> + hycon,threshold:
>> + description: Allows setting the sensitivity in the range from 0 to 255.
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + minimum: 0
>> + maximum: 255
>> +
>> + hycon,glove-enable:
>> + type: boolean
>> + description: Allows enabling glove setting.
>> +
>> + hycon,report-speed:
>> + description: Allows setting the report speed in Hertz.
>
> If in Hertz, use standard unit suffix.
>
>> + $ref: /schemas/types.yaml#/definitions/uint32
>
> And then you can drop this.
Ok
>> + minimum: 0
>
> 0Hz doesn't seem to useful?
You're right, I've also checked and with 0Hz controller correctly does
nothing. I've also tried seeting 1Hz and it actually works, but at 1Hz,
so I keep 1Hz as minimum.
>> + maximum: 255
>> +
>> + hycon,power-noise-enable:
>
> hycon,noise-filter-enable
>
> No one wants to enable power noise. :)
:-) Yeah
>
>> + type: boolean
>> + description: Allows enabling power noise filter.
>> +
>> + hycon,filter-data:
>> + description: Allows setting the filtering data before reporting touch
>> + in the range from 0 to 5.
>
> This is averaging samples? Sounds like something common perhaps.
maybe you mean touchscreen-average-samples property, but this is not the
case.In datasheet they state "Before report coordinate throw away the
data number, setting range：0--5" and I've tried sweep-setting it 1-5
and what I get with filter-data set to 5 is that touchscreen answers
after like 0.5 seconds but keep reporting as fast as set report-speed,
so to me it throws away the first samples because it considers them
"bad" samples when one is first touching the panel. So I'm going to
modify the description as:
description: Allows setting how many samples throw before reporting
touch in the range from 0 to 5.
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + minimum: 0
>> + maximum: 5
>> +
>> + hycon,gain:
>> + description: Allows setting the sensitivity distance in the range from 0 to 5.
>> + $ref: /schemas/types.yaml#/definitions/uint32
>> + minimum: 0
>> + maximum: 5
>> +
>> + hycon,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 {
>
> touchscreen@1c
Ok
>> + compatible = "hycon,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 c80ad735b384..d022ff09e609 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -8243,6 +8243,12 @@ S: Maintained
>> F: mm/hwpoison-inject.c
>> F: mm/memory-failure.c
>>
>> +HYCON HY46XX TOUCHSCREEN SUPPORT
>> +M: Giulio Benetti <giulio.benetti@...ettiengineering.com>
>> +L: linux-input@...r.kernel.org
>> +S: Maintained
>> +F: Documentation/devicetree/bindings/input/touchscreen/hycon,hy46xx.yaml
>> +
>> HYGON PROCESSOR SUPPORT
>> M: Pu Wen <puwen@...on.cn>
>> L: linux-kernel@...r.kernel.org
>> --
>> 2.25.1
>>
Thank you
Best regards
--
Giulio Benetti
Benetti Engineering sas
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