MLK-17426 imx: lpi2c: add debug message when i2c peripheral clk doesn't work

add debug message when i2c peripheral clk rate is 0, then
directly return -EINVAL.

Signed-off-by: Gao Pan <pandy.gao@nxp.com>
Reviewed-by: Andy Duan <fugang.duan@nxp.com>
(Vipul: Fixed merge conflicts)
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>

drivers/i2c/busses/i2c-imx-lpi2c.c

@@ -216,7 +216,12 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
 
 	lpi2c_imx_set_mode(lpi2c_imx);
 
-	clk_rate = clk_get_rate(lpi2c_imx->clk);
+	clk_rate = clk_get_rate(lpi2c_imx->clk_per);
+	if (!clk_rate) {
+		dev_dbg(&lpi2c_imx->adapter.dev, "clk_per rate is 0\n");
+		return -EINVAL;
+	}
+
 	if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
 		filt = 0;
 	else