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usb: gadget: at91_udc: add usb_clk for transition to common clk framework

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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>
This commit is contained in:
Boris BREZILLON 2013-08-02 10:37:34 +02:00 committed by Felipe Balbi
parent 30ce198716
commit c0aefc75ce
2 changed files with 16 additions and 3 deletions
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17
drivers/usb/gadget/at91_udc.c
View file

@ -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 @@ static int at91udc_probe(struct platform_device *pdev)
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;
}

2
drivers/usb/gadget/at91_udc.h
View file

@ -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;