Add support for device-tree device discovery. If devicetree is not
provided, fallback to legacy platform data "discovery".
Signed-off-by: Robert Jarzmik <robert.jarzmik@xxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
---
Since V1: change OF id mrvl,pxa27x_udc -> marvell,pxa27x-udc
This is a consequence of other DT reviews on the marvell
namings.
Since V2: address Mark's comments:
- wildcard pxa27x becomes pxa270
- pullup gpio is described as standard dt gpio
- bool XXX_probe_dt becomes int XXX_probe_dt
Since v5: split out into 2 patches, this one being the second
---
drivers/usb/gadget/udc/pxa27x_udc.c | 44 ++++++++++++++++++++++++++++++++++++-
1 file changed, 43 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/udc/pxa27x_udc.c b/drivers/usb/gadget/udc/pxa27x_udc.c
index 0e356c0..42f4929 100644
--- a/drivers/usb/gadget/udc/pxa27x_udc.c
+++ b/drivers/usb/gadget/udc/pxa27x_udc.c
@@ -26,6 +26,8 @@
#include <linux/prefetch.h>
#include <linux/byteorder/generic.h>
#include <linux/platform_data/pxa2xx_udc.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/usb.h>
#include <linux/usb/ch9.h>
@@ -2405,6 +2407,41 @@ static struct pxa_udc memory = {
}
};
+static struct of_device_id udc_pxa_dt_ids[] = {
+ { .compatible = "marvell,pxa270-udc" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, udc_pxa_dt_ids);
+
+/**
+ * pxa_udc_probe_dt - device tree specific probe
+ * @pdev: platform data
+ * @udc: pxa_udc structure to fill
+ *
+ * Fills udc from platform data out of device tree.
+ *
+ * Returns 0 if DT found, 1 if DT not found, and <0 on error
+ */
+static int pxa_udc_probe_dt(struct platform_device *pdev, struct pxa_udc *udc)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *of_id =
+ of_match_device(udc_pxa_dt_ids, &pdev->dev);
+ u32 gpio_pullup;
+ enum of_gpio_flags flags;
+
+ if (!np || !of_id)
+ return 1;
+ pdev->id = -1;
+
+ gpio_pullup = of_get_gpio_flags(np, 0, &flags);
+ if (gpio_pullup >= 0) {
+ udc->gpio_pullup = gpio_pullup;
+ udc->gpio_pullup_inverted = (flags & OF_GPIO_ACTIVE_LOW);
+ }
+ return 0;
+}
+
/**
* pxa_udc_probe_pdata - legacy platform data probe
* @pdev: platform device
@@ -2433,7 +2470,11 @@ static int pxa_udc_probe(struct platform_device *pdev)
struct pxa_udc *udc = &memory;
int retval = 0;
- pxa_udc_probe_pdata(pdev, udc);
+ retval = pxa_udc_probe_dt(pdev, udc);
+ if (retval < 0)
+ return retval;
+ if (retval > 0)
+ pxa_udc_probe_pdata(pdev, udc);
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs)
@@ -2633,6 +2674,7 @@ static struct platform_driver udc_driver = {
.driver = {
.name = "pxa27x-udc",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(udc_pxa_dt_ids),
},
.probe = pxa_udc_probe,
.remove = pxa_udc_remove,
--
2.0.0.rc2
--
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