serial: pxa: fine-tune clk useage

1) add clk_enable/disable in serial_pxa_console_write()
2) add clk_prepare() to follow common clock driver

Signed-off-by: Yi Zhang <yizhang@marvell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed