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path: root/drivers/spi/spi-s3c64xx.c
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Diffstat (limited to 'drivers/spi/spi-s3c64xx.c')
-rw-r--r--drivers/spi/spi-s3c64xx.c54
1 files changed, 24 insertions, 30 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 75a56968b14c..1c36311935d7 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -197,7 +197,6 @@ struct s3c64xx_spi_driver_data {
struct s3c64xx_spi_dma_data tx_dma;
struct s3c64xx_spi_port_config *port_conf;
unsigned int port_id;
- bool cs_gpio;
};
static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
@@ -754,10 +753,8 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
{
struct s3c64xx_spi_csinfo *cs;
struct device_node *slave_np, *data_np = NULL;
- struct s3c64xx_spi_driver_data *sdd;
u32 fb_delay = 0;
- sdd = spi_master_get_devdata(spi->master);
slave_np = spi->dev.of_node;
if (!slave_np) {
dev_err(&spi->dev, "device node not found\n");
@@ -776,17 +773,6 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata(
return ERR_PTR(-ENOMEM);
}
- /* The CS line is asserted/deasserted by the gpio pin */
- if (sdd->cs_gpio)
- cs->line = of_get_named_gpio(data_np, "cs-gpio", 0);
-
- if (!gpio_is_valid(cs->line)) {
- dev_err(&spi->dev, "chip select gpio is not specified or invalid\n");
- kfree(cs);
- of_node_put(data_np);
- return ERR_PTR(-EINVAL);
- }
-
of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay);
cs->fb_delay = fb_delay;
of_node_put(data_np);
@@ -807,9 +793,16 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
int err;
sdd = spi_master_get_devdata(spi->master);
- if (!cs && spi->dev.of_node) {
+ if (spi->dev.of_node) {
cs = s3c64xx_get_slave_ctrldata(spi);
spi->controller_data = cs;
+ } else if (cs) {
+ /* On non-DT platforms the SPI core will set spi->cs_gpio
+ * to -ENOENT. The GPIO pin used to drive the chip select
+ * is defined by using platform data so spi->cs_gpio value
+ * has to be override to have the proper GPIO pin number.
+ */
+ spi->cs_gpio = cs->line;
}
if (IS_ERR_OR_NULL(cs)) {
@@ -818,18 +811,15 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
}
if (!spi_get_ctldata(spi)) {
- /* Request gpio only if cs line is asserted by gpio pins */
- if (sdd->cs_gpio) {
- err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH,
- dev_name(&spi->dev));
+ if (gpio_is_valid(spi->cs_gpio)) {
+ err = gpio_request_one(spi->cs_gpio, GPIOF_OUT_INIT_HIGH,
+ dev_name(&spi->dev));
if (err) {
dev_err(&spi->dev,
"Failed to get /CS gpio [%d]: %d\n",
- cs->line, err);
+ spi->cs_gpio, err);
goto err_gpio_req;
}
-
- spi->cs_gpio = cs->line;
}
spi_set_ctldata(spi, cs);
@@ -884,7 +874,8 @@ setup_exit:
/* setup() returns with device de-selected */
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
- gpio_free(cs->line);
+ if (gpio_is_valid(spi->cs_gpio))
+ gpio_free(spi->cs_gpio);
spi_set_ctldata(spi, NULL);
err_gpio_req:
@@ -897,14 +888,21 @@ err_gpio_req:
static void s3c64xx_spi_cleanup(struct spi_device *spi)
{
struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi);
- struct s3c64xx_spi_driver_data *sdd;
- sdd = spi_master_get_devdata(spi->master);
- if (spi->cs_gpio) {
+ if (gpio_is_valid(spi->cs_gpio)) {
gpio_free(spi->cs_gpio);
if (spi->dev.of_node)
kfree(cs);
+ else {
+ /* On non-DT platforms, the SPI core sets
+ * spi->cs_gpio to -ENOENT and .setup()
+ * overrides it with the GPIO pin value
+ * passed using platform data.
+ */
+ spi->cs_gpio = -ENOENT;
+ }
}
+
spi_set_ctldata(spi, NULL);
}
@@ -1075,11 +1073,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
sdd->cntrlr_info = sci;
sdd->pdev = pdev;
sdd->sfr_start = mem_res->start;
- sdd->cs_gpio = true;
if (pdev->dev.of_node) {
- if (!of_find_property(pdev->dev.of_node, "cs-gpio", NULL))
- sdd->cs_gpio = false;
-
ret = of_alias_get_id(pdev->dev.of_node, "spi");
if (ret < 0) {
dev_err(&pdev->dev, "failed to get alias id, errno %d\n",