[PATCH v2 4/9] usb: chipidea: usb2: add optional reset support

[Junzhong Pan]

The USB2 controller of SpacemiT K1 SoC requires reset support, to keep
compatibility, add optional reset support.

Acked-by: Peter Chen <peter.chen@xxxxxxxxxx>
Tested-by: Ze Huang <huang.ze@xxxxxxxxx>
Reviewed-by: Troy Mitchell <troy.mitchell@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Junzhong Pan <panjunzhong@xxxxxxxxxxxxxxxxxx>
---
 drivers/usb/chipidea/ci_hdrc_usb2.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_usb2.c b/drivers/usb/chipidea/ci_hdrc_usb2.c
index 6fae2d4a053a..f81673edca3c 100644
--- a/drivers/usb/chipidea/ci_hdrc_usb2.c
+++ b/drivers/usb/chipidea/ci_hdrc_usb2.c
@@ -12,6 +12,7 @@
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
+#include <linux/reset.h>
 #include <linux/usb/chipidea.h>
 #include <linux/usb/hcd.h>
 #include <linux/usb/ulpi.h>
@@ -21,6 +22,7 @@
 struct ci_hdrc_usb2_priv {
 	struct platform_device	*ci_pdev;
 	struct clk		*clk;
+	struct reset_control	*reset;
 };
 
 static const struct ci_hdrc_platform_data ci_default_pdata = {
@@ -75,6 +77,11 @@ static int ci_hdrc_usb2_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, PTR_ERR(priv->clk),
 				     "failed to get or enable the clock\n");
 
+	priv->reset = devm_reset_control_get_optional_exclusive_deasserted(dev, NULL);
+	if (IS_ERR(priv->reset))
+		return dev_err_probe(dev, PTR_ERR(priv->reset),
+				     "failed to get or deassert the reset control\n");
+
 	ci_pdata->name = dev_name(dev);
 
 	priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,

-- 
2.34.1