If the clock framework provides the driver with valid clock,
enable them, otherwise the SCIF might not work if the clock
are not enabled prior to the driver probe.

Signed-off-by: Marek Vasut <marek.vasut+rene...@gmail.com>
Cc: Nobuhiro Iwamatsu <iwama...@nigauri.org>
---
 drivers/serial/serial_sh.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/serial/serial_sh.c b/drivers/serial/serial_sh.c
index 087785f9a2..d9db702803 100644
--- a/drivers/serial/serial_sh.c
+++ b/drivers/serial/serial_sh.c
@@ -226,11 +226,14 @@ static int sh_serial_ofdata_to_platdata(struct udevice 
*dev)
        plat->base = addr;
 
        ret = clk_get_by_name(dev, "fck", &sh_serial_clk);
-       if (!ret)
-               plat->clk = clk_get_rate(&sh_serial_clk);
-       else
+       if (!ret) {
+               ret = clk_enable(&sh_serial_clk);
+               if (!ret)
+                       plat->clk = clk_get_rate(&sh_serial_clk);
+       } else {
                plat->clk = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
                                           "clock", 1);
+       }
 
        plat->type = dev_get_driver_data(dev);
        return 0;
-- 
2.11.0

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