arm: am335x: add Kconfig range attribute to prevent invalid CONS_INDEX

The help message in board/ti/am335x/Kconfig says AM335x has
6 UARTs, so the valid number for CONFIG_CONS_INDEX is from 1 to 6.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Tom Rini <trini@ti.com>

diff --git a/board/ti/am335x/Kconfig b/board/ti/am335x/Kconfig
index 0e5149c..80701f5 100644 (file)
--- a/board/ti/am335x/Kconfig
+++ b/board/ti/am335x/Kconfig
@@ -22,6 +22,7 @@ config SYS_CONFIG_NAME
 
 config CONS_INDEX
        int "UART used for console"
+       range 1 6
        default 1
        help
          The AM335x SoC has a total of 6 UARTs (UART0 to UART5 as referenced