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>
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 27960e4..b715a26 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -502,6 +502,7 @@
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);