USB: ohci-at91: 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).

Changes since v1:
 - use IS_ENABLED(CONFIG_COMMON_CLK) to isolate new at91 clk support

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Boris BREZILLON 2013-08-01 19:09:13 +02:00 • committed by Greg Kroah-Hartman

parent 6753f4cf29

commit 6b0a1cf732

1 changed files with 21 additions and 2 deletions

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23

drivers/usb/host/ohci-at91.c

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