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serial: uartlite: Use dynamic allocation for major number when uart ports > 4

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Device number 204 has a range of minors on major number.
uart_register_driver is failing due to lack of minor numbers
when more number of uart ports used. So, to avoid minor number
limitation on 204 major number use dynamic major allocation
when more than 4 uart ports used otherwise use static major
allocation.

https://docs.kernel.org/arch/arm/sa1100/serial_uart.html

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
Link: https://lore.kernel.org/r/20231116134003.3762725-3-manikanta.guntupalli@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manikanta Guntupalli 2023-11-16 19:10:03 +05:30 committed by Greg Kroah-Hartman
parent 0be916a68c
commit 01c33b8138
2 changed files with 8 additions and 0 deletions
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3
drivers/tty/serial/Kconfig
View File

@ -532,6 +532,9 @@ config SERIAL_UARTLITE_NR_UARTS
help
Set this to the number of uartlites in your system, or the number
you think you might implement.
If maximum number of uartlite serial ports is more than 4, then the
driver uses dynamic allocation instead of static allocation for major
number.
config SERIAL_SUNCORE
bool

5
drivers/tty/serial/uartlite.c
View File

@ -24,8 +24,13 @@
#include <linux/pm_runtime.h>
#define ULITE_NAME "ttyUL"
#if CONFIG_SERIAL_UARTLITE_NR_UARTS > 4
#define ULITE_MAJOR 0 /* use dynamic node allocation */
#define ULITE_MINOR 0
#else
#define ULITE_MAJOR 204
#define ULITE_MINOR 187
#endif
#define ULITE_NR_UARTS CONFIG_SERIAL_UARTLITE_NR_UARTS
/* ---------------------------------------------------------------------