[PATCH 1/2] serial: lpuart: fix RXFE filed offset for i.MX9

[Ye Li]

On 2/18/2026 10:59 PM, Sébastien Szymanski wrote:
> Like i.MX8 and i.MXRT, on i.MX9, the Receive RX FIFO Enable (RXFE) field
> in LPUART FIFO register is bit 3, so set FIFO_RXFE to 0x08 on i.MX9 too.
> 
> Signed-off-by: Sébastien Szymanski <sebastien.szymanski at armadeus.com>
> ---
>   drivers/serial/serial_lpuart.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c
> index 9fdb6503085d..bbce59443388 100644
> --- a/drivers/serial/serial_lpuart.c
> +++ b/drivers/serial/serial_lpuart.c
> @@ -53,7 +53,8 @@
>   #define FIFO_RXSIZE_MASK	0x7
>   #define FIFO_RXSIZE_OFF	0
>   #define FIFO_TXFE		0x80
> -#if defined(CONFIG_ARCH_IMX8) || defined(CONFIG_ARCH_IMXRT)
> +#if defined(CONFIG_ARCH_IMX8) || defined (CONFIG_ARCH_IMX9) || \
> +    defined(CONFIG_ARCH_IMXRT)
>   #define FIFO_RXFE		0x08
>   #else
>   #define FIFO_RXFE		0x40

Previous value 0x40 is wrong for all platforms. You can directly change 
it to 0x08 and remove all ARCH marcos.

Best regards,
Ye Li
>