serial: lpuart: Enable IPG clock

Current codes only ennable the PER clock. However on iMX8 the LPUART
also needs IPG clock which is an LPCG. Should not depend on the default
LPCG setting.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>

diff --git a/drivers/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c
index 51e66abdbc15fd282e422886f987774e5332c620..ce08a6b4486c9e441a51092d69b94c3f3b60baee 100644 (file)
--- a/drivers/serial/serial_lpuart.c
+++ b/drivers/serial/serial_lpuart.c
@@ -480,18 +480,30 @@ static int lpuart_serial_probe(struct udevice *dev)
 {
 #if CONFIG_IS_ENABLED(CLK)
        struct clk per_clk;
+       struct clk ipg_clk;
        int ret;
 
        ret = clk_get_by_name(dev, "per", &per_clk);
        if (!ret) {
                ret = clk_enable(&per_clk);
                if (ret) {
-                       dev_err(dev, "Failed to get per clk: %d\n", ret);
+                       dev_err(dev, "Failed to enable per clk: %d\n", ret);
                        return ret;
                }
        } else {
                debug("%s: Failed to get per clk: %d\n", __func__, ret);
        }
+
+       ret = clk_get_by_name(dev, "ipg", &ipg_clk);
+       if (!ret) {
+               ret = clk_enable(&ipg_clk);
+               if (ret) {
+                       dev_err(dev, "Failed to enable ipg clk: %d\n", ret);
+                       return ret;
+               }
+       } else {
+               debug("%s: Failed to get ipg clk: %d\n", __func__, ret);
+       }
 #endif
 
        if (is_lpuart32(dev))