From 80b444e57948ea4bd5a89fb1f8c404ddab6c1973 Mon Sep 17 00:00:00 2001 From: Thor Thayer Date: Mon, 10 Oct 2016 09:25:25 -0500 Subject: [PATCH] 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 Signed-off-by: Mark Brown --- 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); -- 2.7.4