linux-kernel - [PATCH v2 2/2] usb: phy: omap-usb2: enable 960Mhz clock for omap5

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Date:	Thu, 27 Sep 2012 19:34:08 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<grant.likely@...retlab.ca>, <rob.herring@...xeda.com>,
	<rob@...dley.net>, <linux@....linux.org.uk>,
	<linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
CC:	Kishon Vijay Abraham I <kishon@...com>
Subject: [PATCH v2 2/2] usb: phy: omap-usb2: enable 960Mhz clock for omap5

"usb_otg_ss_refclk960m" is needed for usb2 phy present in omap5. For
omap4, the clk_get of this clock will fail since it does not have this
clock.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/usb/phy/omap-usb2.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/phy/omap-usb2.c b/drivers/usb/phy/omap-usb2.c
index d36c282..5512207 100644
--- a/drivers/usb/phy/omap-usb2.c
+++ b/drivers/usb/phy/omap-usb2.c
@@ -190,6 +190,12 @@ static int __devinit omap_usb2_probe(struct platform_device *pdev)
 	}
 	clk_prepare(phy->wkupclk);
 
+	phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
+	if (IS_ERR(phy->optclk))
+		dev_vdbg(&pdev->dev, "unable to get refclk960m\n");
+	else
+		clk_prepare(phy->optclk);
+
 	usb_add_phy(&phy->phy, USB_PHY_TYPE_USB2);
 
 	platform_set_drvdata(pdev, phy);
@@ -204,6 +210,7 @@ static int __devexit omap_usb2_remove(struct platform_device *pdev)
 	struct omap_usb	*phy = platform_get_drvdata(pdev);
 
 	clk_unprepare(phy->wkupclk);
+	clk_unprepare(phy->optclk);
 	usb_remove_phy(&phy->phy);
 
 	return 0;
@@ -217,6 +224,7 @@ static int omap_usb2_runtime_suspend(struct device *dev)
 	struct omap_usb	*phy = platform_get_drvdata(pdev);
 
 	clk_disable(phy->wkupclk);
+	clk_disable(phy->optclk);
 
 	return 0;
 }
@@ -228,10 +236,16 @@ static int omap_usb2_runtime_resume(struct device *dev)
 	struct omap_usb	*phy = platform_get_drvdata(pdev);
 
 	ret = clk_enable(phy->wkupclk);
-	if (ret < 0)
+	if (ret < 0) {
 		dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
+		return ret;
+	}
 
-	return ret;
+	ret = clk_enable(phy->optclk);
+	if (ret < 0)
+		dev_vdbg(phy->dev, "Failed to enable optclk %d\n", ret);
+
+	return 0;
 }
 
 static const struct dev_pm_ops omap_usb2_pm_ops = {
-- 
1.7.9.5

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