linux-kernel - RE: [PATCH 3/3] ptp_qoriq: convert to use module parameters for initialization

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Date:   Wed, 1 Aug 2018 04:38:41 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     David Miller <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Madalin-cristian Bucur <madalin.bucur@....com>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/3] ptp_qoriq: convert to use module parameters for
 initialization

Hi David,

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: Tuesday, July 31, 2018 12:26 AM
> To: Y.b. Lu <yangbo.lu@....com>
> Cc: netdev@...r.kernel.org; Madalin-cristian Bucur
> <madalin.bucur@....com>; richardcochran@...il.com; robh+dt@...nel.org;
> shawnguo@...nel.org; devicetree@...r.kernel.org;
> linuxppc-dev@...ts.ozlabs.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 3/3] ptp_qoriq: convert to use module parameters for
> initialization
> 
> From: Yangbo Lu <yangbo.lu@....com>
> Date: Mon, 30 Jul 2018 18:01:54 +0800
> 
> > +static unsigned int cksel = DEFAULT_CKSEL; module_param(cksel, uint,
> > +0644); MODULE_PARM_DESC(cksel, "Select reference clock");
> > +
> > +static unsigned int clk_src;
> > +module_param(clk_src, uint, 0644);
> > +MODULE_PARM_DESC(clk_src, "Reference clock frequency (if clocks
> > +property not provided in dts)");
> > +
> > +static unsigned int tmr_prsc = 2;
> > +module_param(tmr_prsc, uint, 0644);
> > +MODULE_PARM_DESC(tmr_prsc, "Output clock division/prescale factor");
> > +
> > +static unsigned int tmr_fiper1 = 1000000000; module_param(tmr_fiper1,
> > +uint, 0644); MODULE_PARM_DESC(tmr_fiper1, "Desired fixed interval
> > +pulse period (ns)");
> > +
> > +static unsigned int tmr_fiper2 = 100000; module_param(tmr_fiper2,
> > +uint, 0644); MODULE_PARM_DESC(tmr_fiper2, "Desired fixed interval
> > +pulse period (ns)");
> 
> Sorry, there is no way I am every applying something like this.  Module
> parameters are to be avoided at all costs.
> 
> And you don't need it here, you have DTS, please use it.
> 
> You are required to support the existing DTS cases, in order to avoid breaking
> things, anyways.
[Y.b. Lu] I get your point. Will drop module_param method.
Thanks a lot for your suggestion.