spi: dw: add support for gpio controlled chip select
Also, use this opportunity to let spi_chip_sel() handle chip-select
deactivation as well.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 357869a..9965e1b 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -24,6 +24,7 @@
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
+#include <linux/gpio.h>
#include "spi-dw.h"
@@ -36,9 +37,6 @@
#define DONE_STATE ((void *)2)
#define ERROR_STATE ((void *)-1)
-#define MRST_SPI_DEASSERT 0
-#define MRST_SPI_ASSERT 1
-
/* Slave spi_dev related */
struct chip_data {
u16 cr0;
@@ -272,8 +270,8 @@
last_transfer = list_last_entry(&msg->transfers, struct spi_transfer,
transfer_list);
- if (!last_transfer->cs_change && dws->cs_control)
- dws->cs_control(MRST_SPI_DEASSERT);
+ if (!last_transfer->cs_change)
+ spi_chip_sel(dws, dws->cur_msg->spi, 0);
spi_finalize_current_message(dws->master);
}
@@ -493,7 +491,7 @@
dw_writew(dws, DW_SPI_CTRL0, cr0);
spi_set_clk(dws, clk_div ? clk_div : chip->clk_div);
- spi_chip_sel(dws, spi->chip_select);
+ spi_chip_sel(dws, spi, 1);
/* Set the interrupt mask, for poll mode just disable all int */
spi_mask_intr(dws, 0xff);
@@ -544,6 +542,7 @@
{
struct dw_spi_chip *chip_info = NULL;
struct chip_data *chip;
+ int ret;
/* Only alloc on first setup */
chip = spi_get_ctldata(spi);
@@ -597,6 +596,13 @@
| (spi->mode << SPI_MODE_OFFSET)
| (chip->tmode << SPI_TMOD_OFFSET);
+ if (gpio_is_valid(spi->cs_gpio)) {
+ ret = gpio_direction_output(spi->cs_gpio,
+ !(spi->mode & SPI_CS_HIGH));
+ if (ret)
+ return ret;
+ }
+
return 0;
}