spi: s3c64xx: group the CS signalling writes in a single function
To enable/disable the CS line, the driver performs a writel in the S3C64XX_SPI_SLAVE_SEL registers. Group the register's configuration in a single function. Signed-off-by: Andi Shyti <andi.shyti@samsung.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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