usb: dwc2: Add reset control to dwc2
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>
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@ -868,6 +868,7 @@ struct dwc2_hsotg {
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void *priv;
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int irq;
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struct clk *clk;
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struct reset_control *reset;
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unsigned int queuing_high_bandwidth:1;
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unsigned int srp_success:1;
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@ -45,6 +45,7 @@
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#include <linux/platform_device.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_data/s3c-hsotg.h>
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#include <linux/reset.h>
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#include <linux/usb/of.h>
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@ -337,6 +338,24 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
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{
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int i, ret;
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hsotg->reset = devm_reset_control_get_optional(hsotg->dev, "dwc2");
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if (IS_ERR(hsotg->reset)) {
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ret = PTR_ERR(hsotg->reset);
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switch (ret) {
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case -ENOENT:
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case -ENOTSUPP:
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hsotg->reset = NULL;
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break;
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default:
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dev_err(hsotg->dev, "error getting reset control %d\n",
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ret);
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return ret;
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}
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}
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if (hsotg->reset)
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reset_control_deassert(hsotg->reset);
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/* Set default UTMI width */
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hsotg->phyif = GUSBCFG_PHYIF16;
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@ -434,6 +453,9 @@ static int dwc2_driver_remove(struct platform_device *dev)
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if (hsotg->ll_hw_enabled)
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dwc2_lowlevel_hw_disable(hsotg);
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if (hsotg->reset)
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reset_control_assert(hsotg->reset);
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return 0;
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}
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