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usb: dwc2: Add reset control to dwc2

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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@opensource.altera.com>
Acked-by: John Youn <johnyoun@synopsys.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Dinh Nguyen 2016-08-10 08:53:34 -05:00 • committed by Felipe Balbi
parent b74c2d875b
commit 83f8da562f
2 changed files with 23 additions and 0 deletions
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1
drivers/usb/dwc2/core.h
View file

@ -868,6 +868,7 @@ struct dwc2_hsotg {
void *priv; void *priv;
int irq; int irq;
struct clk *clk; struct clk *clk;
struct reset_control *reset;
unsigned int queuing_high_bandwidth:1; unsigned int queuing_high_bandwidth:1;
unsigned int srp_success:1; unsigned int srp_success:1;

22
drivers/usb/dwc2/platform.c
View file

@ -45,6 +45,7 @@
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/phy/phy.h> #include <linux/phy/phy.h>
#include <linux/platform_data/s3c-hsotg.h> #include <linux/platform_data/s3c-hsotg.h>
#include <linux/reset.h>
#include <linux/usb/of.h> #include <linux/usb/of.h>
@ -337,6 +338,24 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
{ {
int i, ret; int i, ret;
hsotg->reset = devm_reset_control_get_optional(hsotg->dev, "dwc2");
if (IS_ERR(hsotg->reset)) {
ret = PTR_ERR(hsotg->reset);
switch (ret) {
case -ENOENT:
case -ENOTSUPP:
hsotg->reset = NULL;
break;
default:
dev_err(hsotg->dev, "error getting reset control %d\n",
ret);
return ret;
}
}
if (hsotg->reset)
reset_control_deassert(hsotg->reset);
/* Set default UTMI width */ /* Set default UTMI width */
hsotg->phyif = GUSBCFG_PHYIF16; hsotg->phyif = GUSBCFG_PHYIF16;
@ -434,6 +453,9 @@ static int dwc2_driver_remove(struct platform_device *dev)
if (hsotg->ll_hw_enabled) if (hsotg->ll_hw_enabled)
dwc2_lowlevel_hw_disable(hsotg); dwc2_lowlevel_hw_disable(hsotg);
if (hsotg->reset)
reset_control_assert(hsotg->reset);
return 0; return 0;
} }