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From: Florian Fainelli <florian@openwrt.org>
Organization: OpenWrt
To: Bastien ROUCARIES <roucaries.bastien@gmail.com>,
        Juhos Gabor <juhosg@openwrt.org>
Subject: Re: [PATCH v5] GPIO: add support for 74x164 serial-in/parallel-out 8-bit shift register
Date: Wed, 20 Oct 2010 19:06:40 +0200
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Cc: Willy Tarreau <w@1wt.eu>, linux-kernel@vger.kernel.org,
        akpm@linux-foundation.org, Samuel Ortiz <sameo@linux.intel.com>,
        Miguel Gaio <miguel.gaio@efixo.com>
References: <201010182135.09506.florian@openwrt.org> <AANLkTi=zj0Bns6eo40ksr52YKScarVvhMPNpxdT=Fjp7@mail.gmail.com>
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On Wednesday 20 October 2010 14:51:42 Bastien ROUCARIES wrote:
> On Mon, Oct 18, 2010 at 9:35 PM, Florian Fainelli <florian@openwrt.org> 
wrote:
> > From: Miguel Gaio <miguel.gaio@efixo.com>
> > 
> > This patch adds support for generic 74x164 serial-in/parallel-out 8-bits
> > shift register. This driver can be used as a GPIO output expander.
> 
> Could you add some documentation ? how to wire it both in soft and hard
> part?

This is just an example of course, and I will add a subsequent patch adding an 
entry for it in Documentation/

static struct spi_board_info board_spi_devices[] = {
 {
	.modalias = "74x164",
	.max_speed_hz = 781000,
	.bus_num = 1,
	.controller_data = (void *) SPI_GPIO_NO_CHIPSELECT,
	.mode = SPI_MODE_0,
	.platform_data = &nb4_74x164_platform_data
}
};

and then registering your board_spi_devices with:

spi_register_board_info(board_spi_devices, ARRAY_SIZE(board_spi_devices);
--
Florian