From 8c869edaee07c623066266827371235fb9c12e01 Mon Sep 17 00:00:00 2001
From: Andrew Lunn <andrew@lunn.ch>
Date: Sun, 15 Apr 2012 12:53:47 +0200
Subject: ARM: Orion: EHCI: Add support for enabling clocks

Not all platforms support gating the clock, so it is not an error if
the clock does not exist. However, if it does exist, we should
enable/disable it as appropriate.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index c9fef5b..b0f20c0 100644
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -96,7 +96,7 @@ void __init kirkwood_clk_init(void)
 	ge1 = kirkwood_register_gate("ge1",    CGC_BIT_GE1);
 	sata0 = kirkwood_register_gate("sata0",  CGC_BIT_SATA0);
 	sata1 = kirkwood_register_gate("sata1",  CGC_BIT_SATA1);
-	kirkwood_register_gate("usb0",   CGC_BIT_USB0);
+	usb0 = kirkwood_register_gate("usb0",   CGC_BIT_USB0);
 	kirkwood_register_gate("sdio",   CGC_BIT_SDIO);
 	kirkwood_register_gate("crypto", CGC_BIT_CRYPTO);
 	kirkwood_register_gate("xor0",   CGC_BIT_XOR0);
@@ -115,6 +115,7 @@ void __init kirkwood_clk_init(void)
 	orion_clkdev_add(NULL, "orion_wdt", tclk);
 	orion_clkdev_add("0", "sata_mv.0", sata0);
 	orion_clkdev_add("1", "sata_mv.0", sata1);
+	orion_clkdev_add(NULL, "orion-ehci.0", usb0);
 }
 
 /*****************************************************************************
diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
index 6c6a5a3..82de107 100644
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/mbus.h>
+#include <linux/clk.h>
 #include <plat/ehci-orion.h>
 
 #define rdl(off)	__raw_readl(hcd->regs + (off))
@@ -198,6 +199,7 @@ static int __devinit ehci_orion_drv_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct usb_hcd *hcd;
 	struct ehci_hcd *ehci;
+	struct clk *clk;
 	void __iomem *regs;
 	int irq, err;
 
@@ -238,6 +240,14 @@ static int __devinit ehci_orion_drv_probe(struct platform_device *pdev)
 		goto err2;
 	}
 
+	/* Not all platforms can gate the clock, so it is not
+	   an error if the clock does not exists. */
+	clk = clk_get(&pdev->dev, NULL);
+	if (!IS_ERR(clk)) {
+		clk_prepare_enable(clk);
+		clk_put(clk);
+	}
+
 	hcd = usb_create_hcd(&ehci_orion_hc_driver,
 			&pdev->dev, dev_name(&pdev->dev));
 	if (!hcd) {
@@ -301,12 +311,18 @@ err1:
 static int __exit ehci_orion_drv_remove(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct clk *clk;
 
 	usb_remove_hcd(hcd);
 	iounmap(hcd->regs);
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 	usb_put_hcd(hcd);
 
+	clk = clk_get(&pdev->dev, NULL);
+	if (!IS_ERR(clk)) {
+		clk_disable_unprepare(clk);
+		clk_put(clk);
+	}
 	return 0;
 }
 
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