can: at91_can: add missing prepare and unprepare of the clock
commit e77980e5 upstream. In order to make the driver work with the common clock framework, this patch converts the clk_enable()/clk_disable() to clk_prepare_enable()/clk_disable_unprepare(). While there, add the missing error handling. Signed-off-by: David Dueck <davidcdueck@googlemail.com> Signed-off-by: Anthony Harivel <anthony.harivel@emtrion.de> Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
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