On Tue, 16 Jul 2013, Boris BREZILLON wrote:
> 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 add 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 the usb clk).
This does not take into account any of the changes you discussed with
Russell King and me -- it is exactly the same as the previous version.
> @@ -144,6 +150,11 @@ static int usb_hcd_at91_probe(const struct hc_driver *driver,
> goto err2;
> }
>
> + uclk = clk_get(&pdev->dev, "usb_clk");
> + if (IS_ERR(uclk)) {
> + uclk = NULL;
> + dev_warn(&pdev->dev, "failed to get usb_clk\n");
> + }
> iclk = clk_get(&pdev->dev, "ohci_clk");
> if (IS_ERR(iclk)) {
> dev_err(&pdev->dev, "failed to get ohci_clk\n");
> @@ -212,10 +223,11 @@ static void usb_hcd_at91_remove(struct usb_hcd *hcd,
> release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
> usb_put_hcd(hcd);
>
> + clk_put(uclk);
What will clk_put() do when uclk is NULL?
Alan Stern
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