From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mika Westerberg <mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Subject: Re: [PATCH RFC 2/2] spi: pxa2xx: Only claim CS GPIOs when the slave
 device is created
Date: Fri, 4 Aug 2017 13:29:29 +0300
Message-ID: <20170804102929.GY2369@lahna.fi.intel.com>
References: <cover.1501760433.git.jan.kiszka@siemens.com>
 <5a691263ccf9d61134d6184861b37eaf37b13b77.1501760433.git.jan.kiszka@siemens.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Daniel Mack <daniel-cYrQPVfZoowdnm+yROfE0A@public.gmane.org>,
        Haojian Zhuang <haojian.zhuang-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
        Robert Jarzmik <robert.jarzmik-GANU6spQydw@public.gmane.org>,
        Andy Shevchenko <andy.shevchenko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
        linux-spi <linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
        Linux Kernel Mailing List <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
        linux-arm-kernel <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
To: Jan Kiszka <jan.kiszka-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
Return-path: <linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Content-Disposition: inline
In-Reply-To: <5a691263ccf9d61134d6184861b37eaf37b13b77.1501760433.git.jan.kiszka-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
List-ID: <linux-spi.vger.kernel.org>

On Thu, Aug 03, 2017 at 01:40:33PM +0200, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
> 
> Avoid hogging chip select GPIOs just because they are listed for the
> master. They might be mulitplexed and, if no slave device is attached,
> used for different purposes. Moreover, this strategy avoids having to
> allocate a cs_gpiods structure.
> 
> Tested on the IOT2000 where the second SPI bus is connected to an
> Arduino-compatible connector and multiplexed between SPI, GPIO and PWM
> usage.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>

Acked-by: Mika Westerberg <mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
--
To unsubscribe from this list: send the line "unsubscribe linux-spi" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html