linux-kernel - Re: [PATCH] clk: imx: imx93: introduce clk

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Message-ID: <2023051027-wages-feminine-cb5d@gregkh>
Date:   Wed, 10 May 2023 11:13:51 +0200
From:   Greg KH <greg@...ah.com>
To:     Peng Fan <peng.fan@....com>
Cc:     "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "abelvesa@...nel.org" <abelvesa@...nel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.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] clk: imx: imx93: introduce clk_bypassed module parameter

On Wed, May 10, 2023 at 07:49:20AM +0000, Peng Fan wrote:
> 
> > Subject: Re: [PATCH] clk: imx: imx93: introduce clk_bypassed module
> > parameter
> > 
> > On Thu, May 04, 2023 at 04:55:06PM +0800, Peng Fan (OSS) wrote:
> > > From: Peng Fan <peng.fan@....com>
> > >
> > > With the clk names specified in clk_bypassed module parameter, give
> > > user an option to bypass the clk from managing them by Linux kernel.
> > 
> > As I said on another email, no, please do not add new module parameters
> > for drivers, this is not the 1990s
> 
> After a search of the list,
> https://lore.kernel.org/all/?q=module_param
> 
> I still see many drivers are adding module_param.

And they should not be doing so as it is almost always not a good idea
(note, some subsystems, like sound, do require it, as that's the api
they use, so this is not a blanket statement.)

> Is this is strict ban that new platform driver should not add
> module_param?

You need to really really really justify, and document in the changelog
text, why all of the other methods of configuring a platform driver will
not work in order to have it considered.

thanks,

greg k-h