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authorMasahiro Yamada <yamada.masahiro@socionext.com>2015-10-28 12:46:05 +0900
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-12-13 19:59:48 -0800
commitbd94c4077a0b2ecc35562c294f80f3659ecd8499 (patch)
tree939d81f6945ce1b0925ab4bf6f7e40c399057e17 /include/linux/serial_core.h
parent004e2ed5cc6d89201140ca96693bf9c0b2945f43 (diff)
downloadlwn-bd94c4077a0b2ecc35562c294f80f3659ecd8499.tar.gz
lwn-bd94c4077a0b2ecc35562c294f80f3659ecd8499.zip
serial: support 16-bit register interface for console
Currently, 8-bit (MMIO) and 32-bit (MMIO32) register interfaces are supported for the 8250 console, but the 16-bit (MMIO16) is not. The 8250 UART device on my board is connected to a 16-bit bus and my main motivation is to use earlycon with it. (Refer to arch/arm/boot/dts/uniphier-support-card.dtsi) Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/serial_core.h')
-rw-r--r--include/linux/serial_core.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 297d4fa1cfe5..35aa87b96b71 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -150,6 +150,7 @@ struct uart_port {
#define UPIO_AU (SERIAL_IO_AU) /* Au1x00 and RT288x type IO */
#define UPIO_TSI (SERIAL_IO_TSI) /* Tsi108/109 type IO */
#define UPIO_MEM32BE (SERIAL_IO_MEM32BE) /* 32b big endian */
+#define UPIO_MEM16 (SERIAL_IO_MEM16) /* 16b little endian */
unsigned int read_status_mask; /* driver specific */
unsigned int ignore_status_mask; /* driver specific */