Messages in this thread Patch in this message |  | | From | <> | Subject | [PATCHv3 2/2] spi: dw: Set GPIO_SS flag to toggle Slave Select on GPIO CS | Date | Mon, 10 Oct 2016 09:25:25 -0500 |
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From: Thor Thayer <tthayer@opensource.altera.com>
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> --- v3 Use SPI_MASTER_GPIO_SS --- drivers/spi/spi-dw.c | 1 + 1 file changed, 1 insertion(+)
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 @@ 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); -- 1.7.9.5
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