linux-kernel - Re: [PATCH 07/11] spi-dw: Set number of available chip selects correctly

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Date:	Wed, 22 Jun 2011 21:53:40 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	dirk.brandewie@...il.com
Cc:	linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net
Subject: Re: [PATCH 07/11] spi-dw: Set number of available chip selects correctly

On Wed, Jun 22, 2011 at 8:00 PM,  <dirk.brandewie@...il.com> wrote:
> From: Dirk Brandewie <dirk.brandewie@...il.com>
>
> Only four chip selects are available directly off the pins of the
> master.
>
> Signed-off-by: Dirk Brandewie <dirk.brandewie@...il.com>
> ---
>  drivers/spi/spi-dw-mid.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c
> index 78e64d3..1d11268 100644
> --- a/drivers/spi/spi-dw-mid.c
> +++ b/drivers/spi/spi-dw-mid.c
> @@ -211,7 +211,9 @@ int spi_dw_mid_init(struct spi_dw *dws)
>        dws->max_freq = MRST_SPI_CLK_BASE / (clk_cdiv + 1);
>        iounmap(clk_reg);
>
> -       dws->num_cs = 16;
> +       dws->num_cs = 4;        /* spi_dw_chip_sel() bits 0-3 are
> +                                * valid in the slave enable register
> +                                */

I thought someone had told me that the dw spio core supported using
the 4 cs lines in a multiplex mode to create up to 15 cs lines, but I
may be misremembering.

g.
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