[PATCH] i2c: imx-lpi2c: add debug message when i2c peripheral clk doesn't work

[carlos . song]

From: Gao Pan <pandy.gao@xxxxxxx>

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

Fixes: a55fa9d0e42e ("i2c: imx-lpi2c: add low power i2c bus driver")
Signed-off-by: Gao Pan <pandy.gao@xxxxxxx>
Signed-off-by: Carlos Song <carlos.song@xxxxxxx>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 11240bf8e8e2..62111fe9f207 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -209,6 +209,11 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
 	lpi2c_imx_set_mode(lpi2c_imx);
 
 	clk_rate = clk_get_rate(lpi2c_imx->clks[0].clk);
+	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
-- 
2.34.1