linux-kernel - RE: [PATCH] tty: serial: fsl_lpuart: increase maximum uart

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Date:   Fri, 23 Dec 2022 01:39:01 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Nate Drude <Nate.D@...iscite.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Fugang Duan <fugang.duan@....com>
CC:     "eran.m@...iscite.com" <eran.m@...iscite.com>,
        Nate Drude <Nate.D@...iscite.com>
Subject: RE: [PATCH] tty: serial: fsl_lpuart: increase maximum uart_nr to
 eight



> -----Original Message-----
> From: Nate Drude <nate.d@...iscite.com>
> Sent: 2022年12月22日 22:57
> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Jiri Slaby
> <jirislaby@...nel.org>; linux-serial@...r.kernel.org; linux-
> kernel@...r.kernel.org; Sherry Sun <sherry.sun@....com>; Fugang Duan
> <fugang.duan@....com>
> Cc: eran.m@...iscite.com; Nate Drude <Nate.D@...iscite.com>
> Subject: [PATCH] tty: serial: fsl_lpuart: increase maximum uart_nr to eight
> 
> Some SoCs like the i.MX93 have aliases for up to eight UARTs, see:
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub
> .com%2Ftorvalds%2Flinux%2Fblob%2Fv6.1%2Farch%2Farm64%2Fboot%2Fdt
> s%2Ffreescale%2Fimx93.dtsi%23L31-
> L38&data=05%7C01%7Csherry.sun%40nxp.com%7C09285ba3360a490bce660
> 8dae42cc2d3%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638073
> 178147509133%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJ
> QIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdat
> a=JIvAtw9%2B03uZWQ9OHT9VbmuMVQln0E7UsdQ9H%2FtRtdg%3D&reserv
> ed=0
> 
> Increase UART_NR from 6 to 8 to support lpuart7 and lpuart8 and avoid
> initialization failures like the following:
> 
> [    0.837146] fsl-lpuart 42690000.serial: serial6 out of range
> [    0.842814] fsl-lpuart: probe of 42690000.serial failed with error -22
> 
> Signed-off-by: Nate Drude <nate.d@...iscite.com>

Reviewed-by: Sherry Sun <sherry.sun@....com>

Best Regards
Sherry

> ---
>  drivers/tty/serial/fsl_lpuart.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
> index 900f9a0e4a5d..2e4af8e7a5b6 100644
> --- a/drivers/tty/serial/fsl_lpuart.c
> +++ b/drivers/tty/serial/fsl_lpuart.c
> @@ -246,7 +246,7 @@
> 
>  #define DRIVER_NAME	"fsl-lpuart"
>  #define DEV_NAME	"ttyLP"
> -#define UART_NR		6
> +#define UART_NR		8
> 
>  /* IMX lpuart has four extra unused regs located at the beginning */
>  #define IMX_REG_OFF	0x10
> --
> 2.38.2