i2c: imx-lpi2c: return -EINVAL when i2c peripheral clk doesn't work

On MX8X platforms, the default clock rate is 0 if without explicit
clock setting in dts nodes. I2c can't work when i2c peripheral clk
rate is 0.

Add a i2c peripheral clk rate check before configuring the clock
register. When i2c peripheral clk rate is 0 and directly return
-EINVAL.

Signed-off-by: Carlos Song <carlos.song@nxp.com>
Acked-by: Dong Aisheng <Aisheng.dong@nxp.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index c3287c8..150d923 100644 (file)
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -209,6 +209,9 @@ 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)
+               return -EINVAL;
+
        if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
                filt = 0;
        else