This patch adds the possibility of the "mode" being specified in a device
tree. This allows the scenario when there maybe multiple USB subsystems
operating in different modes.
Signed-off-by: Ruchika Kharwar <ruchika@xxxxxx>
---
Documentation/devicetree/bindings/usb/dwc3.txt | 3 ++-
drivers/usb/dwc3/core.c | 22 ++++++++++++++++++----
2 files changed, 20 insertions(+), 5 deletions(-)
diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index 7a95c65..5c4db93 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -10,7 +10,8 @@ Required properties:
Optional properties:
- tx-fifo-resize: determines if the FIFO *has* to be reallocated.
-
+ - dr_mode: determines the mode of core. This could be "gadget", "host",
+ "drd".
This is usually a subnode to DWC3 glue to which it is connected.
dwc3@4a030000 {
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index c35d49d..cf211be 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -378,7 +378,7 @@ static int dwc3_probe(struct platform_device *pdev)
void *mem;
u8 mode;
-
+ char *dr_mode;
mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
if (!mem) {
dev_err(dev, "not enough memory\n");
@@ -520,9 +520,23 @@ static int dwc3_probe(struct platform_device *pdev)
mode = DWC3_MODE_HOST;
else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
mode = DWC3_MODE_DEVICE;
- else
- mode = DWC3_MODE_DRD;
-
+ else {
+ if (of_property_read_string(node, "dr_mode", &dr_mode)) {
+ dev_warn(dev, "Missing dr_mode so assuming DWC3_MODE_DRD\n");
+ mode = DWC3_MODE_DRD;
+ } else {
+ if (strcmp(dr_mode, "host") == 0)
+ mode = DWC3_MODE_HOST;
+ else if (strcmp(dr_mode, "gadget") == 0)
+ mode = DWC3_MODE_DEVICE;
+ else if (strcmp(dr_mode, "drd") == 0)
+ mode = DWC3_MODE_DRD;
+ else {
+ dev_err(dev, "invalid dr_mode property value\n");
+ goto err0;
+ }
+ }
+ }
switch (mode) {
case DWC3_MODE_DEVICE:
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
--
1.7.5.4
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