Commit 80b444e5 authored Oct 10, 2016 by Thor Thayer Committed by Mark Brown Oct 11, 2016

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>

parent 6b1576aa

drivers/spi/spi-dw.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);