[PATCH AUTOSEL 6.4 13/17] i2c: imx-lpi2c: return -EINVAL when i2c peripheral clk doesn't work

Sasha Levin
2023-08-29T13:34:49Z

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

[ Upstream commit b610c4bbd153c2cde548db48559e170905d7c369 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 4d24ceb57ee74..338171f76daf7 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
--
2.40.1