From: Carlos Song <carlos.song@nxp.com>

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>
---
Changes for V5:
- modify commit log
- modify Signed-off-by list
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index c3287c887c6f..150d923ca7f1 100644
--- 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
-- 
2.34.1

On Wed, Jul 26, 2023 at 05:22:38PM +0800, carlos.song@nxp.com wrote:
> From: Carlos Song <carlos.song@nxp.com>
> 
> 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>

Applied to for-current, thanks!

Hi

On Wed, 26 Jul 2023 17:22:38 +0800, carlos.song@nxp.com wrote:
> 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.
> 
> [...]

Applied to i2c/andi-for-current on

https://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git

Please note that this patch may still undergo further evaluation
and the final decision will be made in collaboration with
Wolfram.

Thank you,
Andi

Patches applied
===============
[1/1] i2c: imx-lpi2c: return -EINVAL when i2c peripheral clk doesn't work
      commit: a83c167c8210a9f289e867bbc084174252f7433f

Hi Carlos,

On Wed, Jul 26, 2023 at 05:22:38PM +0800, carlos.song@nxp.com wrote:
> From: Carlos Song <carlos.song@nxp.com>
> 
> 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>

you are missing here:

Acked-by: Dong Aisheng <Aisheng.dong@nxp.com>

You can also add:

Reviewed-by: Andi Shyti <andi.shyti@kernel.org> 

(no need to resend)

Thanks!
Andi