2 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 730ab4b3d686..f93649e22c43 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -74,8 +74,10 @@ struct uart_8250_port {
         struct list_head        list;           /* ports on this IRQ */
         unsigned short          capabilities;   /* port capabilities */
         unsigned short          bugs;           /* port bugs */
+        bool                    fifo_bug;       /* min RX trigger if enabled */
         unsigned int            tx_loadsz;      /* transmit fifo load size */
         unsigned char           acr;
+        unsigned char           fcr;
         unsigned char           ier;
         unsigned char           lcr;
         unsigned char           mcr;
diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h
index 99b47058816a..df6c9ab6b0cd 100644
--- a/include/uapi/linux/serial_reg.h
+++ b/include/uapi/linux/serial_reg.h
@@ -88,6 +88,11 @@
 #define UART_FCR6_T_TRIGGER_30  0x30 /* Mask for transmit trigger set at 30 */
 #define UART_FCR7_64BYTE        0x20 /* Go into 64 byte mode (TI16C750) */
 
+#define UART_FCR_R_TRIG_SHIFT           6
+#define UART_FCR_R_TRIG_BITS(x)         \
+        (((x) & UART_FCR_TRIGGER_MASK) >> UART_FCR_R_TRIG_SHIFT)
+#define UART_FCR_R_TRIG_MAX_STATE       4
+
 #define UART_LCR        3       /* Out: Line Control Register */
 /*
  * Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting