Merge "USB: dwc3-msm: Add support for setting specific frequency for core clock"

Documentation/devicetree/bindings/usb/msm-ssusb.txt

@@ -50,6 +50,7 @@ Optional properties :
 - qcom,disable-dev-mode-pm: If present, it disables PM runtime functionality for device mode.
 - qcom,disable-host-mode-pm: If present, it disables XHCI PM runtime functionality when USB
   host mode is used.
+- qcom,core-clk-rate: If present, indicates clock frequency to be set for USB master clock.
 - extcon: phandles to external connector devices. First phandle should point to
 	  external connector, which provide "USB" cable events, the second
 	  should point to external connector device, which provide "USB-HOST"

drivers/usb/dwc3/dwc3-msm.c

@@ -2338,14 +2338,23 @@ static int dwc3_msm_get_clk_gdsc(struct dwc3_msm *mdwc)
 		return ret;
 	}
 
-	/*
+	if (!of_property_read_u32(mdwc->dev->of_node, "qcom,core-clk-rate",
-	 * Get Max supported clk frequency for USB Core CLK and request
+				(u32 *)&mdwc->core_clk_rate)) {
-	 * to set the same.
+		mdwc->core_clk_rate = clk_round_rate(mdwc->core_clk,
-	 */
+							mdwc->core_clk_rate);
-	mdwc->core_clk_rate = clk_round_rate(mdwc->core_clk, LONG_MAX);
+	} else {
+		/*
+		 * Get Max supported clk frequency for USB Core CLK and request
+		 * to set the same.
+		 */
+		mdwc->core_clk_rate = clk_round_rate(mdwc->core_clk, LONG_MAX);
+	}
+
 	if (IS_ERR_VALUE(mdwc->core_clk_rate)) {
 		dev_err(mdwc->dev, "fail to get core clk max freq.\n");
 	} else {
+		dev_dbg(mdwc->dev, "USB core frequency = %ld\n",
+							mdwc->core_clk_rate);
 		ret = clk_set_rate(mdwc->core_clk, mdwc->core_clk_rate);
 		if (ret)
 			dev_err(mdwc->dev, "fail to set core_clk freq:%d\n",