spi/imx: add device tree probe support
It adds device tree probe support for spi-imx driver.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 591ebc3..8ac6542 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -34,6 +34,9 @@
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/types.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <mach/spi.h>
@@ -604,6 +607,16 @@
}
};
+static const struct of_device_id spi_imx_dt_ids[] = {
+ { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
+ { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
+ { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
+ { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
+ { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
+ { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
+ { /* sentinel */ }
+};
+
static void spi_imx_chipselect(struct spi_device *spi, int is_active)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
@@ -737,19 +750,25 @@
static int __devinit spi_imx_probe(struct platform_device *pdev)
{
- struct spi_imx_master *mxc_platform_info;
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *of_id =
+ of_match_device(spi_imx_dt_ids, &pdev->dev);
+ struct spi_imx_master *mxc_platform_info =
+ dev_get_platdata(&pdev->dev);
struct spi_master *master;
struct spi_imx_data *spi_imx;
struct resource *res;
int i, ret, num_cs;
- mxc_platform_info = dev_get_platdata(&pdev->dev);
- if (!mxc_platform_info) {
+ if (!np && !mxc_platform_info) {
dev_err(&pdev->dev, "can't get the platform data\n");
return -EINVAL;
}
- num_cs = mxc_platform_info->num_chipselect;
+ ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs);
+ if (ret < 0)
+ num_cs = mxc_platform_info->num_chipselect;
+
master = spi_alloc_master(&pdev->dev,
sizeof(struct spi_imx_data) + sizeof(int) * num_cs);
if (!master)
@@ -764,9 +783,12 @@
spi_imx->bitbang.master = spi_master_get(master);
for (i = 0; i < master->num_chipselect; i++) {
- spi_imx->chipselect[i] = mxc_platform_info->chipselect[i];
- if (spi_imx->chipselect[i] < 0)
+ int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
+ if (cs_gpio < 0)
+ cs_gpio = mxc_platform_info->chipselect[i];
+ if (cs_gpio < 0)
continue;
+ spi_imx->chipselect[i] = cs_gpio;
ret = gpio_request(spi_imx->chipselect[i], DRIVER_NAME);
if (ret) {
while (i > 0) {
@@ -788,7 +810,7 @@
init_completion(&spi_imx->xfer_done);
- spi_imx->devtype_data =
+ spi_imx->devtype_data = of_id ? of_id->data :
(struct spi_imx_devtype_data *) pdev->id_entry->driver_data;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -836,6 +858,7 @@
spi_imx->devtype_data->intctrl(spi_imx, 0);
+ master->dev.of_node = pdev->dev.of_node;
ret = spi_bitbang_start(&spi_imx->bitbang);
if (ret) {
dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
@@ -898,6 +921,7 @@
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = spi_imx_dt_ids,
},
.id_table = spi_imx_devtype,
.probe = spi_imx_probe,