Merge tag 'char-misc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here's the big char/misc driver pull request for 4.2-rc1.

  Lots of mei, extcon, coresight, uio, mic, and other driver updates in
  here.  Full details in the shortlog.  All of these have been in
  linux-next for some time with no reported problems"

* tag 'char-misc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (176 commits)
  mei: me: wait for power gating exit confirmation
  mei: reset flow control on the last client disconnection
  MAINTAINERS: mei: add mei_cl_bus.h to maintained file list
  misc: sram: sort and clean up included headers
  misc: sram: move reserved block logic out of probe function
  misc: sram: add private struct device and virt_base members
  misc: sram: report correct SRAM pool size
  misc: sram: bump error message level on unclean driver unbinding
  misc: sram: fix device node reference leak on error
  misc: sram: fix enabled clock leak on error path
  misc: mic: Fix reported static checker warning
  misc: mic: Fix randconfig build error by including errno.h
  uio: pruss: Drop depends on ARCH_DAVINCI_DA850 from config
  uio: pruss: Add CONFIG_HAS_IOMEM dependence
  uio: pruss: Include <linux/sizes.h>
  extcon: Redefine the unique id of supported external connectors without 'enum extcon' type
  char:xilinx_hwicap:buffer_icap - change 1/0 to true/false for bool type variable in function buffer_icap_set_configuration().
  Drivers: hv: vmbus: Allocate ring buffer memory in NUMA aware fashion
  parport: check exclusive access before register
  w1: use correct lock on error in w1_seq_show()
  ...

1 files changed, 44 insertions, 16 deletions

diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
index 3b33af2416bb..7214efd10db5 100644
--- a/drivers/hwtracing/coresight/coresight-tpiu.c
+++ b/drivers/hwtracing/coresight/coresight-tpiu.c
@@ -17,9 +17,10 @@
 #include <linux/io.h>
 #include <linux/err.h>
 #include <linux/slab.h>
-#include <linux/clk.h>
+#include <linux/pm_runtime.h>
 #include <linux/coresight.h>
 #include <linux/amba/bus.h>
+#include <linux/clk.h>
 
 #include "coresight-priv.h"
 
@@ -50,14 +51,14 @@
 /**
  * @base:	memory mapped base address for this component.
  * @dev:	the device entity associated to this component.
+ * @atclk:	optional clock for the core parts of the TPIU.
  * @csdev:	component vitals needed by the framework.
- * @clk:	the clock this component is associated to.
  */
 struct tpiu_drvdata {
 	void __iomem		*base;
 	struct device		*dev;
+	struct clk		*atclk;
 	struct coresight_device	*csdev;
-	struct clk		*clk;
 };
 
 static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
@@ -72,12 +73,8 @@ static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
 static int tpiu_enable(struct coresight_device *csdev)
 {
 	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
-	int ret;
-
-	ret = clk_prepare_enable(drvdata->clk);
-	if (ret)
-		return ret;
 
+	pm_runtime_get_sync(csdev->dev.parent);
 	tpiu_enable_hw(drvdata);
 
 	dev_info(drvdata->dev, "TPIU enabled\n");
@@ -101,8 +98,7 @@ static void tpiu_disable(struct coresight_device *csdev)
 	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 
 	tpiu_disable_hw(drvdata);
-
-	clk_disable_unprepare(drvdata->clk);
+	pm_runtime_put(csdev->dev.parent);
 
 	dev_info(drvdata->dev, "TPIU disabled\n");
 }
@@ -139,6 +135,12 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 		return -ENOMEM;
 
 	drvdata->dev = &adev->dev;
+	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
+	if (!IS_ERR(drvdata->atclk)) {
+		ret = clk_prepare_enable(drvdata->atclk);
+		if (ret)
+			return ret;
+	}
 	dev_set_drvdata(dev, drvdata);
 
 	/* Validity for the resource is already checked by the AMBA core */
@@ -148,15 +150,10 @@ static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
 
 	drvdata->base = base;
 
-	drvdata->clk = adev->pclk;
-	ret = clk_prepare_enable(drvdata->clk);
-	if (ret)
-		return ret;
-
 	/* Disable tpiu to support older devices */
 	tpiu_disable_hw(drvdata);
 
-	clk_disable_unprepare(drvdata->clk);
+	pm_runtime_put(&adev->dev);
 
 	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
 	if (!desc)
@@ -183,11 +180,41 @@ static int tpiu_remove(struct amba_device *adev)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int tpiu_runtime_suspend(struct device *dev)
+{
+	struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
+
+	if (drvdata && !IS_ERR(drvdata->atclk))
+		clk_disable_unprepare(drvdata->atclk);
+
+	return 0;
+}
+
+static int tpiu_runtime_resume(struct device *dev)
+{
+	struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
+
+	if (drvdata && !IS_ERR(drvdata->atclk))
+		clk_prepare_enable(drvdata->atclk);
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops tpiu_dev_pm_ops = {
+	SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
+};
+
 static struct amba_id tpiu_ids[] = {
 	{
 		.id	= 0x0003b912,
 		.mask	= 0x0003ffff,
 	},
+	{
+		.id	= 0x0004b912,
+		.mask	= 0x0007ffff,
+	},
 	{ 0, 0},
 };
 
@@ -195,6 +222,7 @@ static struct amba_driver tpiu_driver = {
 	.drv = {
 		.name	= "coresight-tpiu",
 		.owner	= THIS_MODULE,
+		.pm	= &tpiu_dev_pm_ops,
 	},
 	.probe		= tpiu_probe,
 	.remove		= tpiu_remove,