[PATCH 3/4] serial: lpuart: Enable IPG clock

[Sébastien Szymanski]

From: Ye Li <ye.li at nxp.com>

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 at nxp.com>
Reviewed-by: Peng Fan <peng.fan at nxp.com>
Signed-off-by: Sébastien Szymanski <sebastien.szymanski at armadeus.com>
---

This commit comes from downstream U-Boot:
https://github.com/nxp-imx/uboot-imx/commit/16aa73211a260c6f04d489ff8aa3476c670a7022

 drivers/serial/serial_lpuart.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c
index 51e66abdbc15..ce08a6b4486c 100644
--- 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))
-- 
2.41.0