linux-kernel - Re: [PATCH v7 1/2] serial: sc16is7xx

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Date:	Fri, 25 Apr 2014 22:28:10 +0400
From:	Alexander Shiyan <shc_work@...l.ru>
To:	Jon Ringle <jon@...gle.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org 
	<linux-serial@...r.kernel.org>,
	linux-kernel@...r.kernel.org 
	<linux-kernel@...r.kernel.org>,
	Jon Ringle <jringle@...dpoint.com>
Subject: Re: [PATCH v7 1/2] serial: sc16is7xx

Fri, 25 Apr 2014 14:24:23 -0400 от Jon Ringle <jon@...gle.org>:
> On Fri, Apr 25, 2014 at 1:40 PM, Alexander Shiyan <shc_work@...l.ru> wrote:
> > Fri, 25 Apr 2014 10:26:40 -0700 от Greg KH <gregkh@...uxfoundation.org>:
> >> On Thu, Apr 24, 2014 at 08:56:06PM -0400, jon@...gle.org wrote:
> >> > From: Jon Ringle <jringle@...dpoint.com>
> >> >
> >> > The SC16IS7xx is a slave I2C-bus/SPI interface to a single-channel
> >> > high performance UART. The SC16IS7xx's internal register set is
> >> > backward-compatible with the widely used and widely popular 16C450.
> >> >
> >> > The SC16IS7xx also provides additional advanced features such as
> >> > auto hardware and software flow control, automatic RS-485 support, and
> >> > software reset.
> >> >
> >> > Signed-off-by: Jon Ringle <jringle@...dpoint.com>
> >> > ---
> >> >  drivers/tty/serial/Kconfig       |    9 +
> >> >  drivers/tty/serial/Makefile      |    1 +
> >> >  drivers/tty/serial/sc16is7xx.c   | 1279 ++++++++++++++++++++++++++++++++++++++
> >> >  include/uapi/linux/serial_core.h |    3 +
> >> >  4 files changed, 1292 insertions(+)
> >> >  create mode 100644 drivers/tty/serial/sc16is7xx.c
> >>
> >> I get a few build warnings with this patch applied:
> >>
> >> drivers/tty/serial/sc16is7xx.c:1059:12: warning: ‘sc16is7xx_probe’ defined but not used [-Wunused-function]
> >>  static int sc16is7xx_probe(struct device *dev,
> >>             ^
> >> drivers/tty/serial/sc16is7xx.c:1175:12: warning: ‘sc16is7xx_remove’ defined but not used [-Wunused-function]
> >>  static int sc16is7xx_remove(struct device *dev)
> >>             ^
> >> drivers/tty/serial/sc16is7xx.c:1214:29: warning: ‘regcfg’ defined but not used [-Wunused-variable]
> >>  static struct regmap_config regcfg = {
> >>                              ^
> >>
> >> Can you send a follow-on patch to fix them?
> >
> > Seems this just should contain: "depends on I2C" in the Kconfig.
> 
> I can add "depends on I2C" in Kconfig for now, but I'm just wondering
> how would this be dealt with when sometime in the future this driver
> supports either I2C or SPI? Can the "depends on" be conditional
> somehow?

If anyone adds SPI support later, this can be represented as:
depends on I2C || SPI_MASTER
select REGMAP_I2C if I2C
select REGMAP_SPI if SPI_MASTER

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