linux-kernel - Help about chip select on SPI slave devices

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Message-ID: <BAY158-ds1590A0C95D4EFEDF3B1B5EF5580@phx.gbl>
Date:	Sat, 16 Oct 2010 18:33:22 +0800
From:	WANG YiFei <yifei_wang@...mail.com>
To:	<linux-kernel@...r.kernel.org>
Subject: Help about chip select on SPI slave devices

Hi,

We have a board which has 1 SPI master controller
and 4 SPI slave devices, and we'd like to use 2
GPIOs to demux to chip select these slave devices.
Can anyone tell me if current powerpc dts support
demuxer for chip select for spi slave devices? So
far as I know, in dts, SPI master can only use 1
to 1 GPIO to CS(then needs 4 GPIOs).

Thanks in advance,
YiFei

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