dmaengine: imx-sdma: add device tree probe support
It adds device tree probe support for imx-sdma driver.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index df40069..1eb60de 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -32,6 +32,8 @@
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <asm/irq.h>
#include <mach/sdma.h>
@@ -332,6 +334,13 @@
};
MODULE_DEVICE_TABLE(platform, sdma_devtypes);
+static const struct of_device_id sdma_dt_ids[] = {
+ { .compatible = "fsl,imx31-sdma", .data = &sdma_devtypes[IMX31_SDMA], },
+ { .compatible = "fsl,imx35-sdma", .data = &sdma_devtypes[IMX35_SDMA], },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sdma_dt_ids);
+
#define SDMA_H_CONFIG_DSPDMA (1 << 12) /* indicates if the DSPDMA is used */
#define SDMA_H_CONFIG_RTD_PINS (1 << 11) /* indicates if Real-Time Debug pins are enabled */
#define SDMA_H_CONFIG_ACR (1 << 4) /* indicates if AHB freq /core freq = 2 or 1 */
@@ -1250,6 +1259,10 @@
static int __init sdma_probe(struct platform_device *pdev)
{
+ const struct of_device_id *of_id =
+ of_match_device(sdma_dt_ids, &pdev->dev);
+ struct device_node *np = pdev->dev.of_node;
+ const char *fw_name;
int ret;
int irq;
struct resource *iores;
@@ -1265,7 +1278,7 @@
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
- if (!iores || irq < 0 || !pdata) {
+ if (!iores || irq < 0) {
ret = -EINVAL;
goto err_irq;
}
@@ -1295,6 +1308,8 @@
if (!sdma->script_addrs)
goto err_alloc;
+ if (of_id)
+ pdev->id_entry = of_id->data;
sdma->devtype = pdev->id_entry->driver_data;
dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
@@ -1325,10 +1340,30 @@
if (ret)
goto err_init;
- if (pdata->script_addrs)
+ if (pdata && pdata->script_addrs)
sdma_add_scripts(sdma, pdata->script_addrs);
- sdma_get_firmware(sdma, pdata->fw_name);
+ if (pdata) {
+ sdma_get_firmware(sdma, pdata->fw_name);
+ } else {
+ /*
+ * Because that device tree does not encode ROM script address,
+ * the RAM script in firmware is mandatory for device tree
+ * probe, otherwise it fails.
+ */
+ ret = of_property_read_string(np, "fsl,sdma-ram-script-name",
+ &fw_name);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to get firmware name\n");
+ goto err_init;
+ }
+
+ ret = sdma_get_firmware(sdma, fw_name);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to get firmware\n");
+ goto err_init;
+ }
+ }
sdma->dma_device.dev = &pdev->dev;
@@ -1376,6 +1411,7 @@
static struct platform_driver sdma_driver = {
.driver = {
.name = "imx-sdma",
+ .of_match_table = sdma_dt_ids,
},
.id_table = sdma_devtypes,
.remove = __exit_p(sdma_remove),