linux-kernel - Re: [PATCH 1/2] dt-bindings: input: Add Nuvoton MA35D1 keypad

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Message-ID: <5d9e89aa-db10-4367-8417-9fcc1a3bb37a@gmail.com>
Date: Tue, 29 Oct 2024 10:00:39 +0800
From: Ming-Jen Chen <mjchen0829@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-input@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 mjchen@...oton.com, peng.fan@....com, sudeep.holla@....com, arnd@...db.de,
 conor+dt@...nel.org, krzk+dt@...nel.org, robh@...nel.org,
 dmitry.torokhov@...il.com
Subject: Re: [PATCH 1/2] dt-bindings: input: Add Nuvoton MA35D1 keypad

On 2024/10/28 下午 03:04, Krzysztof Kozlowski wrote:

> On 28/10/2024 02:15, Ming-Jen Chen wrote:
>> On 2024/10/25 下午 07:42, Krzysztof Kozlowski wrote:
>>> On 25/10/2024 07:36, Ming-Jen Chen wrote:
>>>>>> +      0  = 0 clock
>>>>>> +      1  = 0 clock
>>>>>> +      2  = 0 clock
>>>>> Heh? So this is just 0
>>>>>
>>>>>> +      3  = 8 clocks
>>>>> This is 8
>>>>>
>>>>>> +      4  = 16 clocks
>>>>> 16, not 4
>>>>>
>>>>>> +      5  = 32 clocks
>>>>>> +      6  = 64 clocks
>>>>>> +      7  = 128 clocks
>>>>>> +      8  = 256 clocks
>>>>>> +      9  = 512 clocks
>>>>>> +      10 = 1024 clocks
>>>>>> +      11 = 2048 clocks
>>>>>> +      12 = 4096 clocks
>>>>>> +      13 = 8192 clocks
>>>>> Use proper enum
>>>> I will update the definition to specify the debounce period in terms of
>>>> keypad IP clock cycles, as follow:
>>>>
>>>> nuvoton,debounce-period:
>>>>        type: integer
>>>>        enum: [0, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
>>>>        description: |
>>>>            Key debounce period select, specified in terms of keypad IP
>>>> clock cycles.
>>>>            This value corresponds to the register setting for the keypad
>>>> interface.
>>>>            The following values indicate the debounce time:
>>>>            - 0 = 0 clock cycles (no debounce)
>>>>            - 3 = 8 clock cycles
>>>>            - 4 = 16 clock cycles
>>>>            - 5 = 32 clock cycles
>>>>            - 6 = 64 clock cycles
>>>>            - 7 = 128 clock cycles
>>>>            - 8 = 256 clock cycles
>>>>            - 9 = 512 clock cycles
>>>>            - 10 = 1024 clock cycles
>>>>            - 11 = 2048 clock cycles
>>>>            - 12 = 4096 clock cycles
>>>>            - 13 = 8192 clock cycles
>>> No. 0, 8, 16, 32 , 64 etc.
>> I will change it to the following content:
>>
>> nuvoton,debounce-period:
>>     type:  integer
>>     enum:  [0,8,16,32,64,128,256,512,1024,2048,4096,8192]
>>     description:  | Key debounce period select, specified in terms of keypad IP clock
>> cycles. Valid values include 0 (no debounce) and specific clock cycle
>> values: 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, and 8192.
>>
>>>>>> +
>>>>>> +  per-scale:
>>>>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>>>>> +    description: Row Scan Cycle Pre-scale Value (1 to 256).
>>>>> Missing constraints
>>>>>
>>>>>> +
>>>>>> +  per-scalediv:
>>>>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>>>>> +    description: Per-scale divider (1 to 256).
>>>>> Missing constraints
>>>>>
>>>>> Both properties are unexpected... aren't you duplicating existing
>>>>> properties?
>>>> pre-scale:
>>>> This value configures the IC register for the row scan cycle
>>>> pre-scaling, with valid values ranging from 1 to 256
>>>> per-scalediv:(I will change pre-scalediv to pre-scale-div)
>>> Please look for matching existing properties first.
>> I will change it to the following content:
>>
>> nuvoton,scan-time:
> Why? What about my request?

I utilized|grep|  to search for relevant properties in the|input/|  folder using keywords such as|scan|,|time|,|period|,|freq|, and|interval|.
While I found some similar properties, I did not locate any that completely meet my requirements.

For example, I found|"scanning_period"|, which is described as "Time between scans. Each step is 1024 us. Valid 1-256."
I would like to confirm if you are suggesting that I use|scanning_period|  and explain my specific use case in the description,
for example:

nuvoton,scanning-period:
     type:  uint32
     description:  | Set the scan time for each key, specified in terms of keypad IP clock 
cycles. The valid range is from 1 to 256.      minimum:  1
     maximum:  256 Could you please confirm if this approach aligns with your suggestion,
  or if you have any other recommended existing properties?

Thank you for your assistance!

>
>
> Best regards,
> Krzysztof

Best regards,
Ming-Jen Chen