From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
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;
}
--
1.7.2
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