From: Dinh Nguyen <dinguyen@xxxxxxxxxxxxxxxxxxxxx>
Allow for platforms that have a reset controller driver in place to bring
the USB IP out of reset.
Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxxxxxxxxxxxxx>
Cc: John Youn <johnyoun@xxxxxxxxxxxx>
---
drivers/usb/dwc2/core.h | 1 +
drivers/usb/dwc2/platform.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 3c58d63..f748132 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -837,6 +837,7 @@ struct dwc2_hsotg {
void *priv;
int irq;
struct clk *clk;
+ struct reset_control *reset;
unsigned int queuing_high_bandwidth:1;
unsigned int srp_success:1;
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 88629be..b1fa9dd 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -45,6 +45,7 @@
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/platform_data/s3c-hsotg.h>
+#include <linux/reset.h>
#include <linux/usb/of.h>
@@ -337,6 +338,9 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
{
int i, ret;
+ if(hsotg->reset)
+ reset_control_deassert(hsotg->reset);
+
/* Set default UTMI width */
hsotg->phyif = GUSBCFG_PHYIF16;
@@ -434,6 +438,9 @@ static int dwc2_driver_remove(struct platform_device *dev)
if (hsotg->ll_hw_enabled)
dwc2_lowlevel_hw_disable(hsotg);
+ if (hsotg->reset)
+ reset_control_assert(hsotg->reset);
+
return 0;
}
@@ -529,6 +536,14 @@ static int dwc2_driver_probe(struct platform_device *dev)
dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
(unsigned long)res->start, hsotg->regs);
+ hsotg->reset = devm_reset_control_get(&dev->dev, "dwc2");
+ if (IS_ERR(hsotg->reset)) {
+ dev_info(&dev->dev, "Could not get reset control!\n");
+ if (PTR_ERR(hsotg->reset) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ hsotg->reset = NULL;
+ }
+
retval = dwc2_lowlevel_hw_init(hsotg);
if (retval)
return retval;
--
1.7.9.5
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