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

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Message-ID: <20151220164353.6ef29f77@lxorguk.ukuu.org.uk>
Date:	Sun, 20 Dec 2015 16:43:53 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH v3] serial: 8250: add gpio support to exar

> v3: Alan commented on v2, few things like NULL check, name of the gpio chip,
> moving some more code into the gpio code. He also commented on it being
> a separate module, but since this will not be needed by someone who is not
> using Exar chip, and even those who are using, some of them may not need it.
> This is optional for only those who wants to use the gpio capability of that
> chip. So kept it as a separate module. Waiting for your comments on that.

That doesn't work because you reference the methods in it so it will
always be dragged in. You would have to make the exar driver an MFD that
provided a serial and a gpio binding to fix that up I think, or instead
of having the serial driver call into your gpio driver (thus forcing the
module into memory) you would have the serial driver create a platform
device or similar that the GPIO device bound to.

Alan
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