tree 3bfccab6e9f7fa585b31f88bec1cec8ebe19e98e
parent 01cfef57efe9c8ef445d4a5ad3bf26770fd5942a
author Geert Uytterhoeven <geert+renesas@linux-m68k.org> 1392907384 +0100
committer Mark Brown <broonie@linaro.org> 1393038672 +0900

spi: sh-msiof: Use the core cs_gpio field, and make it optional

In current implementation, CS is controlled by GPIO, which is passed
through spi->controller_data.  However, the MSIOF HW module has a function
to output CS by itself, which is already enabled and actual switch will be
done by pinmux.

Store the GPIO number in the core cs_gpio field, and ignore it if it is
an invalid (negative) GPIO number.

Loosely based on a patch from Takashi Yoshii <takasi-y@ops.dti.ne.jp>.

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>