spi: dw: Set GPIO_SS flag to toggle Slave Select on GPIO CS

The Designware SPI master requires slave selection before the transfer
can begin [1].

This patch uses the new master flag to indicate both the GPIO CS and
the internal chip select should be used.

Tested On:
    Altera CycloneV development kit
    Compile tested for build errors on x86_64 (allyesconfigs)

[1] DesignWare dw_apb_ssi Databook, Version 3.20a (page 39)

Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Thor Thayer 2016-10-10 09:25:25 -05:00 коммит произвёл Mark Brown
Родитель 6b1576aa87
Коммит 80b444e579
1 изменённых файлов: 1 добавлений и 0 удалений

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@ -502,6 +502,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
master->handle_err = dw_spi_handle_err;
master->max_speed_hz = dws->max_freq;
master->dev.of_node = dev->of_node;
master->flags = SPI_MASTER_GPIO_SS;
/* Basic HW init */
spi_hw_init(dev, dws);