linux-kernel - Re: [v14 0/2] Support pwm driver for aspeed ast26xx

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Date:   Wed, 8 Dec 2021 04:02:22 +0000
From:   Billy Tsai <billy_tsai@...eedtech.com>
To:     Rob Herring <robh@...nel.org>, Joel Stanley <joel@....id.au>
CC:     Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Andrew Jeffery <andrew@...id.au>,
        Lee Jones <lee.jones@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-Konig <u.kleine-koenig@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        BMC-SW <BMC-SW@...eedtech.com>
Subject: Re: [v14 0/2] Support pwm driver for aspeed ast26xx

Hi Rob,

On 2021/12/8, 5:20 AM, "Rob Herring" <robh@...nel.org> wrote:

    On Tue, Dec 07, 2021 at 06:45:47AM +0000, Joel Stanley wrote:
    >   > Hi Billy,
    >   > 
    >   > On Tue, 30 Nov 2021 at 05:58, Billy Tsai <billy_tsai@...eedtech.com> wrote:
    >   > >
    >   > > The legacy driver of aspeed pwm is binding with tach controller and it
    >   > > doesn't follow the pwm framworks usage. In addition, the pwm register
    >   > > usage of the 6th generation of ast26xx has drastic change. So these
    >   > > patch serials add the new aspeed pwm driver to fix up the problem above.
    >   > 
    >   > Sorry for not taking a look earlier. Well done on making it this far.
    >   > 
    >   > There's a few things that need to be addressed before merging this.
    >   > 
    >   > Firstly, the bindings need fixing up. I think these should be the one
    >   > file. The device tree bindings are supposed to describe the hardware,
    >   > and it doesn't make sense to separate them out just because we plan on
    >   > using two subsystems to implement the functionality.
    >   > 
    >   > Rob, please chime in if you would prefer something different.

    >   I prefer to see a common binding for fans which I said multiple times 
    >   on this series. As the same thing keeps getting posted, I've stopped 
    >   looking at this one.

Sorry to have bothered you so many times.
As I mention in v9:
"This patch doesn't use to binding the fan control h/w. It is used to binding the two independent h/w blocks.
One is used to provide pwm output and another is used to monitor the speed of the input.
It is different from "aspeed-pwm-tacho.txt" and "npcm750-pwm-fan.txt" which only focus on fan usage.
It is more like the "kontron,sl28cpld.yaml" the device includes a fan monitor and PWM output devices."
My purpose is to give more flexibility to our drivers and can use the existing driver "pwm-fan" to control
the fan instead of creating the code like XXX-pwm-fan to do the same thing.

Thanks

Best Regards,
Billy Tsai