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authorThomas Abraham <thomas.abraham@linaro.org>2012-07-13 07:15:14 +0900
committerKukjin Kim <kgene.kim@samsung.com>2012-07-13 15:23:48 +0900
commit1c20c200ef96c50b3075f71220c8c8bc018a93c8 (patch)
tree3625e8277a760ae16b0580bd6091a14ae036a9a2 /drivers/spi
parent4d0efdd5889b1c81a62aa07a47d3d55be4b65b61 (diff)
downloadlinux-1c20c200ef96c50b3075f71220c8c8bc018a93c8.tar.bz2
spi: s3c64xx: Remove the 'set_level' callback from controller data
The set_level callback in the controller data, which is used to configure the slave select line, cannot be supported when migrating the driver to device tree based discovery. Since all the platforms currently use gpio as the slave select line, this callback can be removed from the controller data and replaced with call to gpio_set_value in the driver. Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Jaswinder Singh <jaswinder.singh@linaro.org> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-s3c64xx.c31
1 files changed, 26 insertions, 5 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 0a9e43e635aa..e4182ea2f306 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -27,6 +27,7 @@
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
+#include <linux/gpio.h>
#include <mach/dma.h>
#include <plat/s3c64xx-spi.h>
@@ -411,14 +412,14 @@ static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd,
if (sdd->tgl_spi != spi) { /* if last mssg on diff device */
/* Deselect the last toggled device */
cs = sdd->tgl_spi->controller_data;
- cs->set_level(cs->line,
- spi->mode & SPI_CS_HIGH ? 0 : 1);
+ gpio_set_value(cs->line,
+ spi->mode & SPI_CS_HIGH ? 0 : 1);
}
sdd->tgl_spi = NULL;
}
cs = spi->controller_data;
- cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0);
+ gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0);
}
static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd,
@@ -504,7 +505,7 @@ static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd,
if (sdd->tgl_spi == spi)
sdd->tgl_spi = NULL;
- cs->set_level(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1);
+ gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1);
}
static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
@@ -833,11 +834,21 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
unsigned long flags;
int err = 0;
- if (cs == NULL || cs->set_level == NULL) {
+ if (cs == NULL) {
dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select);
return -ENODEV;
}
+ if (!spi_get_ctldata(spi)) {
+ err = gpio_request(cs->line, dev_name(&spi->dev));
+ if (err) {
+ dev_err(&spi->dev, "request for slave select gpio "
+ "line [%d] failed\n", cs->line);
+ return -EBUSY;
+ }
+ spi_set_ctldata(spi, cs);
+ }
+
sdd = spi_master_get_devdata(spi->master);
sci = sdd->cntrlr_info;
@@ -908,6 +919,15 @@ setup_exit:
return err;
}
+static void s3c64xx_spi_cleanup(struct spi_device *spi)
+{
+ struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
+
+ if (cs)
+ gpio_free(cs->line);
+ spi_set_ctldata(spi, NULL);
+}
+
static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
{
struct s3c64xx_spi_driver_data *sdd = data;
@@ -1049,6 +1069,7 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
master->bus_num = sdd->port_id;
master->setup = s3c64xx_spi_setup;
+ master->cleanup = s3c64xx_spi_cleanup;
master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
master->transfer_one_message = s3c64xx_spi_transfer_one_message;
master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;