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

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Message-Id: <20221222145634.2217793-1-nate.d@variscite.com>
Date:   Thu, 22 Dec 2022 08:56:34 -0600
From:   Nate Drude <nate.d@...iscite.com>
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://github.com/torvalds/linux/blob/v6.1/arch/arm64/boot/dts/freescale/imx93.dtsi#L31-L38

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>
---
 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