patches.socfpga/0065-spi-dw-Set-GPIO_SS-flag-to-toggle-Slave-Select-on-GP.patch

From 1d1b6b573a601464ca8ec40ace560a30fa00bdf4 Mon Sep 17 00:00:00 2001
From: Thor Thayer <tthayer@opensource.altera.com>
Date: Mon, 10 Oct 2016 09:25:25 -0500
Subject: [PATCH 065/103] 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>
---
 drivers/spi/spi-dw.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -505,6 +505,7 @@ int dw_spi_add_host(struct device *dev,
 	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);