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| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2010-07-19 16:01:42 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 14:35:43 -0700 |
| commit | 31ee04de7e670de4199572595cce4aaa7f7f6351 (patch) | |
| tree | 87757aa24d1654239d96fdaa152ec1f198e96ae6 | |
| parent | 1eb838d3e2a473acbb9b21278e75b79640fb2c7b (diff) | |
| download | kernel_samsung_aries-31ee04de7e670de4199572595cce4aaa7f7f6351.zip kernel_samsung_aries-31ee04de7e670de4199572595cce4aaa7f7f6351.tar.gz kernel_samsung_aries-31ee04de7e670de4199572595cce4aaa7f7f6351.tar.bz2 | |
USB: s3c-hsotg: add support for clock gating
This patch adds support for clock gating of the HS/OTG block. On S5PV210
otg gating clock is initally disabled so the driver needs to get and
enable it before it can access its registers.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/gadget/s3c-hsotg.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c index 258ca01..521ebed 100644 --- a/drivers/usb/gadget/s3c-hsotg.c +++ b/drivers/usb/gadget/s3c-hsotg.c @@ -152,6 +152,7 @@ struct s3c_hsotg { void __iomem *regs; struct resource *regs_res; int irq; + struct clk *clk; unsigned int dedicated_fifos:1; @@ -3258,13 +3259,20 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev) hsotg->dev = dev; hsotg->plat = plat; + hsotg->clk = clk_get(&pdev->dev, "otg"); + if (IS_ERR(hsotg->clk)) { + dev_err(dev, "cannot get otg clock\n"); + ret = -EINVAL; + goto err_mem; + } + platform_set_drvdata(pdev, hsotg); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(dev, "cannot find register resource 0\n"); ret = -EINVAL; - goto err_mem; + goto err_clk; } hsotg->regs_res = request_mem_region(res->start, resource_size(res), @@ -3272,7 +3280,7 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev) if (!hsotg->regs_res) { dev_err(dev, "cannot reserve registers\n"); ret = -ENOENT; - goto err_mem; + goto err_clk; } hsotg->regs = ioremap(res->start, resource_size(res)); @@ -3325,6 +3333,8 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev) /* reset the system */ + clk_enable(hsotg->clk); + s3c_hsotg_gate(pdev, true); s3c_hsotg_otgreset(hsotg); @@ -3348,7 +3358,8 @@ err_regs: err_regs_res: release_resource(hsotg->regs_res); kfree(hsotg->regs_res); - +err_clk: + clk_put(hsotg->clk); err_mem: kfree(hsotg); return ret; @@ -3370,6 +3381,9 @@ static int __devexit s3c_hsotg_remove(struct platform_device *pdev) s3c_hsotg_gate(pdev, false); + clk_disable(hsotg->clk); + clk_put(hsotg->clk); + kfree(hsotg); return 0; } |