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authorBoris BREZILLON <b.brezillon@overkiz.com>2013-08-02 10:37:34 +0200
committerFelipe Balbi <balbi@ti.com>2013-08-02 14:17:03 +0200
commitc0aefc75ce2512bc308a89ca3cb7bece63c1128f (patch)
treeae223d608eb593e7acd63b644db8e34698fd49dc
parentusb: gadget: at91_udc: add missing clk_put on fclk and iclk (diff)
downloadlinux-c0aefc75ce2512bc308a89ca3cb7bece63c1128f.tar.xz
linux-c0aefc75ce2512bc308a89ca3cb7bece63c1128f.zip
usb: gadget: at91_udc: add usb_clk for transition to common clk framework
The AT91 PMC (Power Management Controller) provides an USB clock used by USB Full Speed host (ohci) and USB Full Speed device (udc). The usb drivers (ohci and udc) must configure this clock to 48Mhz. This configuration was formely done in mach-at91/clock.c, but this implementation will be removed when moving to common clk framework. This patch adds support for usb clock retrieval and configuration, and is backward compatible with the current at91 clk implementation (if usb clk is not found, it does not configure/enable it). Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
-rw-r--r--drivers/usb/gadget/at91_udc.c17
-rw-r--r--drivers/usb/gadget/at91_udc.h2
2 files changed, 16 insertions, 3 deletions
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index 94d1d3cacce8..4cc4fd6d1473 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -870,6 +870,11 @@ static void clk_on(struct at91_udc *udc)
if (udc->clocked)
return;
udc->clocked = 1;
+
+ if (IS_ENABLED(CONFIG_COMMON_CLK)) {
+ clk_set_rate(udc->uclk, 48000000);
+ clk_prepare_enable(udc->uclk);
+ }
clk_prepare_enable(udc->iclk);
clk_prepare_enable(udc->fclk);
}
@@ -882,6 +887,8 @@ static void clk_off(struct at91_udc *udc)
udc->gadget.speed = USB_SPEED_UNKNOWN;
clk_disable_unprepare(udc->fclk);
clk_disable_unprepare(udc->iclk);
+ if (IS_ENABLED(CONFIG_COMMON_CLK))
+ clk_disable_unprepare(udc->uclk);
}
/*
@@ -1774,10 +1781,12 @@ static int at91udc_probe(struct platform_device *pdev)
/* get interface and function clocks */
udc->iclk = clk_get(dev, "udc_clk");
udc->fclk = clk_get(dev, "udpck");
- if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
+ if (IS_ENABLED(CONFIG_COMMON_CLK))
+ udc->uclk = clk_get(dev, "usb_clk");
+ if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk) ||
+ (IS_ENABLED(CONFIG_COMMON_CLK) && IS_ERR(udc->uclk))) {
DBG("clocks missing\n");
retval = -ENODEV;
- /* NOTE: we "know" here that refcounts on these are NOPs */
goto fail1;
}
@@ -1851,6 +1860,8 @@ fail3:
fail2:
free_irq(udc->udp_irq, udc);
fail1:
+ if (IS_ENABLED(CONFIG_COMMON_CLK) && !IS_ERR(udc->uclk))
+ clk_put(udc->uclk);
if (!IS_ERR(udc->fclk))
clk_put(udc->fclk);
if (!IS_ERR(udc->iclk))
@@ -1898,6 +1909,8 @@ static int __exit at91udc_remove(struct platform_device *pdev)
clk_put(udc->iclk);
clk_put(udc->fclk);
+ if (IS_ENABLED(CONFIG_COMMON_CLK))
+ clk_put(udc->uclk);
return 0;
}
diff --git a/drivers/usb/gadget/at91_udc.h b/drivers/usb/gadget/at91_udc.h
index e647d1c2ada4..017524663381 100644
--- a/drivers/usb/gadget/at91_udc.h
+++ b/drivers/usb/gadget/at91_udc.h
@@ -126,7 +126,7 @@ struct at91_udc {
unsigned active_suspend:1;
u8 addr;
struct at91_udc_data board;
- struct clk *iclk, *fclk;
+ struct clk *iclk, *fclk, *uclk;
struct platform_device *pdev;
struct proc_dir_entry *pde;
void __iomem *udp_baseaddr;