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

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Message-ID: <20151220144722.GA26499@sudip-pc>
Date:	Sun, 20 Dec 2015 20:17:22 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Subject: Re: [PATCH v3] serial: 8250: add gpio support to exar

On Sun, Dec 20, 2015 at 04:18:17PM +0200, Andy Shevchenko wrote:
> On Sun, Dec 20, 2015 at 3:24 PM, Sudip Mukherjee
> <sudipm.mukherjee@...il.com> wrote:
> > Exar XR17V352/354/358 chips have 16 multi-purpose inputs/outputs which
> > can be controlled using gpio interface.
> > Add support to use these pins and select GPIO_SYSFS also so that these
> > pins can be used from the userspace through sysfs.
> >
> > Tested-by: Rob Groner <rgroner@....com>
> > Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> 
Hi Andy,
Thanks for the review. Just a few doubts below.

> > @@ -0,0 +1,261 @@
> > +/*
> > + * GPIO driver for Exar XR17V35X chip
> > + *
> > + * Copyright (C) 2015 Sudip Mukherjee <sudipm.mukherjee@...il.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + */
<snip>
> > +
> > +err_destroy:
> > +       mutex_unlock(&exar_mtx);
> > +       mutex_destroy(&exar_gpio->lock);
> > +err_unmap:
> > +       iounmap(p);
> 
> pci_iounmap?

I thought about pci_iounmap but I saw that most of the code in
8250_pci.c is using iounmap, so i went in favor of the majority.
Will change it.

> 
> > +       return ret;
> > +}
> > +EXPORT_SYMBOL(xr17v35x_gpio_init);
> > +
> 
> > +static void __exit exar_gpio_exit(void)
> > +{
> > +}
> > +
> > +module_exit(exar_gpio_exit);
> > +
> > +static int __init exar_gpio_init(void)
> > +{
> > +       return 0;
> > +}
> > +
> > +module_init(exar_gpio_init);
> > +
> 
> Useless for now. You are using it as a library.

Main doubt here. If I do not give the module_init() and module_exit()
then what entry do i keep in the Kconfig? In this v3, it is kept as
tristate. Should that be bool then? 

regards
sudip
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