linux-kernel - Re: [PATCH v3] serial: 8250: add gpio support to exar

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Message-ID: <20151222100859.GA24622@sudip-pc>
Date:	Tue, 22 Dec 2015 15:38:59 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Jiri Slaby <jslaby@...e.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v3] serial: 8250: add gpio support to exar

On Tue, Dec 22, 2015 at 11:58:17AM +0200, Andy Shevchenko wrote:
> On Tue, Dec 22, 2015 at 6:27 AM, Sudip Mukherjee
> <sudipm.mukherjee@...il.com> wrote:
> > On Mon, Dec 21, 2015 at 08:28:51PM +0200, Andy Shevchenko wrote:
> >> On Mon, Dec 21, 2015 at 5:19 PM, Sudip Mukherjee
> >> <sudipm.mukherjee@...il.com> wrote:
> >>
> 
> >> There are at least two approaches:
> >>  - use 8250_pci, etc as a library (see example: 8250_mid.c)
> >>  - force 8250_pci to use external libraries in some cases (seems your approach)
> 
> Third one btw is to blow up the 8250_pci. (This actually was the main
> reason why we chose separate driver approach in our case).
> 
> >> Of course better to gather maintainer's opinion first.
> >
> > Greg, can you please give some idea here about the best way to approach...
> > I personally think, having it as a module with the minor changes that
> > Alan and Andy has suggested is the best approach.
> 
> > The only downside is
> > that the module gets loaded even if the device is not there.
> 
> How is that?

Alan explained that in https://lkml.org/lkml/2015/12/20/103

Quoting from his mail "you reference the methods in it so it will
always be dragged in".

And I wanted to verify that so I tested today morning after removing the
card from my local system and after booting I saw having 8250_gpi loaded.

regards
sudip
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