linux-kernel - [PATCH v2 3/7] usb: dwc3-omap: use runtime API's to enable clocks

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Message-ID: <1349087107-18229-4-git-send-email-kishon@ti.com>
Date:	Mon, 1 Oct 2012 15:55:03 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<grant.likely@...retlab.ca>, <rob.herring@...xeda.com>,
	<rob@...dley.net>, <balbi@...com>, <gregkh@...uxfoundation.org>,
	<kishon@...com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: [PATCH v2 3/7] usb: dwc3-omap: use runtime API's to enable clocks

Before accessing any register, runtime API's should be invoked to enable
the clocks. runtime API's are added here to prevent abort during register
access.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/usb/dwc3/dwc3-omap.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index cb4037a..850a0cf 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -43,6 +43,7 @@
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/dwc3-omap.h>
+#include <linux/pm_runtime.h>
 #include <linux/dma-mapping.h>
 #include <linux/ioport.h>
 #include <linux/io.h>
@@ -272,6 +273,13 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 	omap->irq	= irq;
 	omap->base	= base;
 
+	pm_runtime_enable(dev);
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0) {
+		dev_err(dev, "get_sync failed with err %d\n", ret);
+		return ret;
+	}
+
 	reg = dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS);
 
 	utmi_mode = of_get_property(node, "utmi-mode", &size);
@@ -348,6 +356,8 @@ static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 
 static int __devexit dwc3_omap_remove(struct platform_device *pdev)
 {
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
 	device_for_each_child(&pdev->dev, NULL, dwc3_omap_remove_core);
 
 	return 0;
-- 
1.7.9.5

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