linux-kernel - Re: [v6 2/4] dt-bindings: hwmon: Add ASPEED TACH Control documentation

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Date:   Fri, 14 Jul 2023 03:26:42 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     蔡承達 <billyking19920205@...il.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "jdelvare@...e.com" <jdelvare@...e.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "corbet@....net" <corbet@....net>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "patrick@...cx.xyz" <patrick@...cx.xyz>,
        Billy Tsai <billy_tsai@...eedtech.com>
Subject: Re: [v6 2/4] dt-bindings: hwmon: Add ASPEED TACH Control
 documentation

On 7/14/23 03:18, 蔡承達 wrote:
> Guenter Roeck <linux@...ck-us.net> 於 2023年7月14日 週五 下午5:59寫道：
>>
>> On 7/14/23 00:13, Krzysztof Kozlowski wrote:
>>> On 14/07/2023 09:04, 蔡承達 wrote:
>>>
>>>>           > This is because our register layout for PWM and Tach is not
>>>> continuous.
>>>>
>>>>           > PWM0 used 0x0 0x4, Tach0 used 0x8 0xc
>>>>
>>>>           > PWM1 used 0x10 0x14, Tach1 used 0x18 0x1c
>>>>
>>>>           > ...
>>>>
>>>>           > Each PWM/Tach instance has its own controller register and is not
>>>> dependent on others.
>>>
>>> Your email reply quoting style is very difficult to read.
>>>
>>>>
>>>>
>>>>
>>>> Hi Guenter,
>>>>
>>>>
>>>>
>>>> Did you receive a response to my previous email?
>>>>
>>>> I would like to inquire if you have any further concerns regarding the PWM
>>>> and Tach with 16 instances.
>>>
>>> But isn't like this in all PWMs in all SoCs?
>>>
>>
>> Correct, pretty much every fan controller is implemented that way.
>> I don't understand the logic.
>>
> 
> Hi Krzysztof and Guenter,
> 
> Apologies for any confusion earlier.
> So, you think that the implementation with 16 instances of TACH/PWM
> device nodes in dts instead of one is ok to you, right?
> 

Did I say that ? No, it is not ok with me. It is confusing and doesn't make
sense to me. This is one fan controller with 16 channels, not 16 separate
controllers.

Guenter