ipq806x: usb: Control USB master reset

Picking commit from QSDK
https://source.codeaurora.org/quic/qsdk/oss/kernel/linux-msm/commit/?h=eggplant&id=a86bda9f8a7965f0cedd347a9c04800eb9f41ea3

Commit message:
"During removal of the glue layer(dwc3-of-simple), USB master reset is set to active and during insertion it is de-activated."

Change-Id: I537dc810f6cb2a46664ee674840145066432b957
Signed-off-by: Vasudevan Murugesan <vmuruges@codeaurora.org>
(cherry picked from commit 4611e13580a216812f85f0801b95442d02eeb836)"

Signed-off-by: Pavel Kubelun <be.dissent@gmail.com>

target/linux/ipq806x/files-4.9/arch/arm/boot/dts/qcom-ipq8064.dtsi

@@ -967,6 +967,9 @@
 
 			ranges;
 
+			resets = <&gcc USB30_0_MASTER_RESET>;
+			reset-names = "usb30_mstr_rst";
+
 			status = "disabled";
 
 			dwc3@11000000 {

target/linux/ipq806x/patches-4.9/0074-ipq806x-usb-Control-USB-master-reset.patch

@@ -0,0 +1,64 @@
+From a86bda9f8a7965f0cedd347a9c04800eb9f41ea3 Mon Sep 17 00:00:00 2001
+From: Vasudevan Murugesan <vmuruges@codeaurora.org>
+Date: Tue, 21 Jul 2015 10:22:38 +0530
+Subject: ipq806x: usb: Control USB master reset
+
+During removal of the glue layer(dwc3-of-simple),
+USB master reset is set to active and during insertion
+it is de-activated.
+
+Change-Id: I537dc810f6cb2a46664ee674840145066432b957
+Signed-off-by: Vasudevan Murugesan <vmuruges@codeaurora.org>
+(cherry picked from commit 4611e13580a216812f85f0801b95442d02eeb836)
+---
+ drivers/usb/dwc3/dwc3-of-simple.c | 12 ++++++++++++
+ 1 file changed, 12 insertions(+)
+
+(limited to 'drivers/usb/dwc3/dwc3-of-simple.c')
+
+diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
+index f9e92ef..49bf556 100644
+--- a/drivers/usb/dwc3/dwc3-of-simple.c
++++ b/drivers/usb/dwc3/dwc3-of-simple.c
+@@ -26,6 +26,7 @@
+ #include <linux/dma-mapping.h>
+ #include <linux/clk.h>
+ #include <linux/clk-provider.h>
++#include <linux/reset.h>
+ #include <linux/of.h>
+ #include <linux/of_platform.h>
+ #include <linux/pm_runtime.h>
+@@ -34,6 +35,7 @@ struct dwc3_of_simple {
+ 	struct device		*dev;
+ 	struct clk		**clks;
+ 	int			num_clocks;
++	struct reset_control	*mstr_rst;
+ };
+ 
+ static int dwc3_of_simple_probe(struct platform_device *pdev)
+@@ -89,6 +91,13 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
+ 		simple->clks[i] = clk;
+ 	}
+ 
++	simple->mstr_rst = devm_reset_control_get(dev, "usb30_mstr_rst");
++
++	if (!IS_ERR(simple->mstr_rst))
++		reset_control_deassert(simple->mstr_rst);
++	else
++		dev_dbg(simple->dev, "cannot get handle for master reset control\n");
++
+ 	ret = of_platform_populate(np, NULL, NULL, dev);
+ 	if (ret) {
+ 		for (i = 0; i < simple->num_clocks; i++) {
+@@ -117,6 +126,9 @@ static int dwc3_of_simple_remove(struct platform_device *pdev)
+ 		clk_put(simple->clks[i]);
+ 	}
+ 
++	if (!IS_ERR(simple->mstr_rst))
++		reset_control_assert(simple->mstr_rst);
++
+ 	of_platform_depopulate(dev);
+ 
+ 	pm_runtime_put_sync(dev);
+-- 
+cgit v1.1