serial: sh: Enable clock if available

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+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

diff --git a/drivers/serial/serial_sh.c b/drivers/serial/serial_sh.c
index 087785f9a249ef7151456ae46b9d09d53db70d54..d9db702803cad66f2c036920af32fd7cadb01ba1 100644 (file)
--- 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;