On 12/08/2013 22:42, boris brezillon :
Hello Nicolas,
On 12/08/2013 15:52, Nicolas Ferre wrote:
On 01/08/2013 08:18, Boris BREZILLON :
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@xxxxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
Is there a reason you acked this version but not the 3rd one
(https://lkml.org/lkml/2013/8/2/102).
No, only flow of emails while getting back online ;-)
Bye,
---
drivers/usb/gadget/at91_udc.c | 17 ++++++++++++++++-
drivers/usb/gadget/at91_udc.h | 2 +-
2 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/at91_udc.c
b/drivers/usb/gadget/at91_udc.c
index fce8e4e..ae06585 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_ERR(udc->uclk)) {
+ 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_ERR(udc->uclk))
+ clk_disable_unprepare(udc->uclk);
}
/*
@@ -1774,10 +1781,10 @@ 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");
+ udc->uclk = clk_get(dev, "usb_clk");
if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
DBG("clocks missing\n");
retval = -ENODEV;
- /* NOTE: we "know" here that refcounts on these are NOPs */
goto fail1;
}
@@ -1851,6 +1858,12 @@ fail3:
fail2:
free_irq(udc->udp_irq, udc);
fail1:
+ if (!IS_ERR(udc->uclk))
+ clk_put(udc->uclk);
+ if (!IS_ERR(udc->fclk))
+ clk_put(udc->fclk);
+ if (!IS_ERR(udc->iclk))
+ clk_put(udc->iclk);
iounmap(udc->udp_baseaddr);
fail0a:
if (cpu_is_at91rm9200())
@@ -1894,6 +1907,8 @@ static int __exit at91udc_remove(struct
platform_device *pdev)
clk_put(udc->iclk);
clk_put(udc->fclk);
+ if (!IS_ERR(udc->uclk))
+ clk_put(udc->uclk);
return 0;
}
diff --git a/drivers/usb/gadget/at91_udc.h
b/drivers/usb/gadget/at91_udc.h
index e647d1c..0175246 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;
--
Nicolas Ferre
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