diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index e7ffd01669f5..6236deb28905 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -28,214 +28,7 @@
 #include <linux/serial_core.h>
 #include <linux/clk.h>
 
-#define DRIVER_NAME "stm32-usart"
-
-struct stm32_usart_offsets {
-	u8 cr1;
-	u8 cr2;
-	u8 cr3;
-	u8 brr;
-	u8 gtpr;
-	u8 rtor;
-	u8 rqr;
-	u8 isr;
-	u8 icr;
-	u8 rdr;
-	u8 tdr;
-};
-
-struct stm32_usart_config {
-	u8 uart_enable_bit; /* USART_CR1_UE */
-	bool has_7bits_data;
-};
-
-struct stm32_usart_info {
-	struct stm32_usart_offsets ofs;
-	struct stm32_usart_config cfg;
-};
-
-#define UNDEF_REG ~0
-
-/* Register offsets */
-struct stm32_usart_info stm32f4_info = {
-	.ofs = {
-		.isr	= 0x00,
-		.rdr	= 0x04,
-		.tdr	= 0x04,
-		.brr	= 0x08,
-		.cr1	= 0x0c,
-		.cr2	= 0x10,
-		.cr3	= 0x14,
-		.gtpr	= 0x18,
-		.rtor	= UNDEF_REG,
-		.rqr	= UNDEF_REG,
-		.icr	= UNDEF_REG,
-	},
-	.cfg = {
-		.uart_enable_bit = 13,
-		.has_7bits_data = false,
-	}
-};
-
-struct stm32_usart_info stm32f7_info = {
-	.ofs = {
-		.cr1	= 0x00,
-		.cr2	= 0x04,
-		.cr3	= 0x08,
-		.brr	= 0x0c,
-		.gtpr	= 0x10,
-		.rtor	= 0x14,
-		.rqr	= 0x18,
-		.isr	= 0x1c,
-		.icr	= 0x20,
-		.rdr	= 0x24,
-		.tdr	= 0x28,
-	},
-	.cfg = {
-		.uart_enable_bit = 0,
-		.has_7bits_data = true,
-	}
-};
-
-/* USART_SR (F4) / USART_ISR (F7) */
-#define USART_SR_PE		BIT(0)
-#define USART_SR_FE		BIT(1)
-#define USART_SR_NF		BIT(2)
-#define USART_SR_ORE		BIT(3)
-#define USART_SR_IDLE		BIT(4)
-#define USART_SR_RXNE		BIT(5)
-#define USART_SR_TC		BIT(6)
-#define USART_SR_TXE		BIT(7)
-#define USART_SR_LBD		BIT(8)
-#define USART_SR_CTSIF		BIT(9)
-#define USART_SR_CTS		BIT(10)		/* F7 */
-#define USART_SR_RTOF		BIT(11)		/* F7 */
-#define USART_SR_EOBF		BIT(12)		/* F7 */
-#define USART_SR_ABRE		BIT(14)		/* F7 */
-#define USART_SR_ABRF		BIT(15)		/* F7 */
-#define USART_SR_BUSY		BIT(16)		/* F7 */
-#define USART_SR_CMF		BIT(17)		/* F7 */
-#define USART_SR_SBKF		BIT(18)		/* F7 */
-#define USART_SR_TEACK		BIT(21)		/* F7 */
-#define USART_SR_ERR_MASK	(USART_SR_LBD | USART_SR_ORE | \
-				 USART_SR_FE | USART_SR_PE)
-/* Dummy bits */
-#define USART_SR_DUMMY_RX	BIT(16)
-
-/* USART_DR */
-#define USART_DR_MASK		GENMASK(8, 0)
-
-/* USART_BRR */
-#define USART_BRR_DIV_F_MASK	GENMASK(3, 0)
-#define USART_BRR_DIV_M_MASK	GENMASK(15, 4)
-#define USART_BRR_DIV_M_SHIFT	4
-
-/* USART_CR1 */
-#define USART_CR1_SBK		BIT(0)
-#define USART_CR1_RWU		BIT(1)		/* F4 */
-#define USART_CR1_RE		BIT(2)
-#define USART_CR1_TE		BIT(3)
-#define USART_CR1_IDLEIE	BIT(4)
-#define USART_CR1_RXNEIE	BIT(5)
-#define USART_CR1_TCIE		BIT(6)
-#define USART_CR1_TXEIE		BIT(7)
-#define USART_CR1_PEIE		BIT(8)
-#define USART_CR1_PS		BIT(9)
-#define USART_CR1_PCE		BIT(10)
-#define USART_CR1_WAKE		BIT(11)
-#define USART_CR1_M		BIT(12)
-#define USART_CR1_M0		BIT(12)		/* F7 */
-#define USART_CR1_MME		BIT(13)		/* F7 */
-#define USART_CR1_CMIE		BIT(14)		/* F7 */
-#define USART_CR1_OVER8		BIT(15)
-#define USART_CR1_DEDT_MASK	GENMASK(20, 16)	/* F7 */
-#define USART_CR1_DEAT_MASK	GENMASK(25, 21)	/* F7 */
-#define USART_CR1_RTOIE		BIT(26)		/* F7 */
-#define USART_CR1_EOBIE		BIT(27)		/* F7 */
-#define USART_CR1_M1		BIT(28)		/* F7 */
-#define USART_CR1_IE_MASK	(GENMASK(8, 4) | BIT(14) | BIT(26) | BIT(27))
-
-/* USART_CR2 */
-#define USART_CR2_ADD_MASK	GENMASK(3, 0)	/* F4 */
-#define USART_CR2_ADDM7		BIT(4)		/* F7 */
-#define USART_CR2_LBDL		BIT(5)
-#define USART_CR2_LBDIE		BIT(6)
-#define USART_CR2_LBCL		BIT(8)
-#define USART_CR2_CPHA		BIT(9)
-#define USART_CR2_CPOL		BIT(10)
-#define USART_CR2_CLKEN		BIT(11)
-#define USART_CR2_STOP_2B	BIT(13)
-#define USART_CR2_STOP_MASK	GENMASK(13, 12)
-#define USART_CR2_LINEN		BIT(14)
-#define USART_CR2_SWAP		BIT(15)		/* F7 */
-#define USART_CR2_RXINV		BIT(16)		/* F7 */
-#define USART_CR2_TXINV		BIT(17)		/* F7 */
-#define USART_CR2_DATAINV	BIT(18)		/* F7 */
-#define USART_CR2_MSBFIRST	BIT(19)		/* F7 */
-#define USART_CR2_ABREN		BIT(20)		/* F7 */
-#define USART_CR2_ABRMOD_MASK	GENMASK(22, 21)	/* F7 */
-#define USART_CR2_RTOEN		BIT(23)		/* F7 */
-#define USART_CR2_ADD_F7_MASK	GENMASK(31, 24)	/* F7 */
-
-/* USART_CR3 */
-#define USART_CR3_EIE		BIT(0)
-#define USART_CR3_IREN		BIT(1)
-#define USART_CR3_IRLP		BIT(2)
-#define USART_CR3_HDSEL		BIT(3)
-#define USART_CR3_NACK		BIT(4)
-#define USART_CR3_SCEN		BIT(5)
-#define USART_CR3_DMAR		BIT(6)
-#define USART_CR3_DMAT		BIT(7)
-#define USART_CR3_RTSE		BIT(8)
-#define USART_CR3_CTSE		BIT(9)
-#define USART_CR3_CTSIE		BIT(10)
-#define USART_CR3_ONEBIT	BIT(11)
-#define USART_CR3_OVRDIS	BIT(12)		/* F7 */
-#define USART_CR3_DDRE		BIT(13)		/* F7 */
-#define USART_CR3_DEM		BIT(14)		/* F7 */
-#define USART_CR3_DEP		BIT(15)		/* F7 */
-#define USART_CR3_SCARCNT_MASK	GENMASK(19, 17)	/* F7 */
-
-/* USART_GTPR */
-#define USART_GTPR_PSC_MASK	GENMASK(7, 0)
-#define USART_GTPR_GT_MASK	GENMASK(15, 8)
-
-/* USART_RTOR */
-#define USART_RTOR_RTO_MASK	GENMASK(23, 0)	/* F7 */
-#define USART_RTOR_BLEN_MASK	GENMASK(31, 24)	/* F7 */
-
-/* USART_RQR */
-#define USART_RQR_ABRRQ		BIT(0)		/* F7 */
-#define USART_RQR_SBKRQ		BIT(1)		/* F7 */
-#define USART_RQR_MMRQ		BIT(2)		/* F7 */
-#define USART_RQR_RXFRQ		BIT(3)		/* F7 */
-#define USART_RQR_TXFRQ		BIT(4)		/* F7 */
-
-/* USART_ICR */
-#define USART_ICR_PECF		BIT(0)		/* F7 */
-#define USART_ICR_FFECF		BIT(1)		/* F7 */
-#define USART_ICR_NCF		BIT(2)		/* F7 */
-#define USART_ICR_ORECF		BIT(3)		/* F7 */
-#define USART_ICR_IDLECF	BIT(4)		/* F7 */
-#define USART_ICR_TCCF		BIT(6)		/* F7 */
-#define USART_ICR_LBDCF		BIT(8)		/* F7 */
-#define USART_ICR_CTSCF		BIT(9)		/* F7 */
-#define USART_ICR_RTOCF		BIT(11)		/* F7 */
-#define USART_ICR_EOBCF		BIT(12)		/* F7 */
-#define USART_ICR_CMCF		BIT(17)		/* F7 */
-
-#define STM32_SERIAL_NAME "ttyS"
-#define STM32_MAX_PORTS 6
-
-struct stm32_port {
-	struct uart_port port;
-	struct clk *clk;
-	struct stm32_usart_info *info;
-	bool hw_flow_control;
-};
-
-static struct stm32_port stm32_ports[STM32_MAX_PORTS];
-static struct uart_driver stm32_usart_driver;
+#include "stm32-usart.h"
 
 static void stm32_stop_tx(struct uart_port *port);
 
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
new file mode 100644
index 000000000000..75f8388c91df
--- /dev/null
+++ b/drivers/tty/serial/stm32-usart.h
@@ -0,0 +1,215 @@
+/*
+ * Copyright (C) Maxime Coquelin 2015
+ * Authors:  Maxime Coquelin <mcoquelin.stm32@gmail.com>
+ *	     Gerald Baeza <gerald_baeza@yahoo.fr>
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#define DRIVER_NAME "stm32-usart"
+
+struct stm32_usart_offsets {
+	u8 cr1;
+	u8 cr2;
+	u8 cr3;
+	u8 brr;
+	u8 gtpr;
+	u8 rtor;
+	u8 rqr;
+	u8 isr;
+	u8 icr;
+	u8 rdr;
+	u8 tdr;
+};
+
+struct stm32_usart_config {
+	u8 uart_enable_bit; /* USART_CR1_UE */
+	bool has_7bits_data;
+};
+
+struct stm32_usart_info {
+	struct stm32_usart_offsets ofs;
+	struct stm32_usart_config cfg;
+};
+
+#define UNDEF_REG ~0
+
+/* Register offsets */
+struct stm32_usart_info stm32f4_info = {
+	.ofs = {
+		.isr	= 0x00,
+		.rdr	= 0x04,
+		.tdr	= 0x04,
+		.brr	= 0x08,
+		.cr1	= 0x0c,
+		.cr2	= 0x10,
+		.cr3	= 0x14,
+		.gtpr	= 0x18,
+		.rtor	= UNDEF_REG,
+		.rqr	= UNDEF_REG,
+		.icr	= UNDEF_REG,
+	},
+	.cfg = {
+		.uart_enable_bit = 13,
+		.has_7bits_data = false,
+	}
+};
+
+struct stm32_usart_info stm32f7_info = {
+	.ofs = {
+		.cr1	= 0x00,
+		.cr2	= 0x04,
+		.cr3	= 0x08,
+		.brr	= 0x0c,
+		.gtpr	= 0x10,
+		.rtor	= 0x14,
+		.rqr	= 0x18,
+		.isr	= 0x1c,
+		.icr	= 0x20,
+		.rdr	= 0x24,
+		.tdr	= 0x28,
+	},
+	.cfg = {
+		.uart_enable_bit = 0,
+		.has_7bits_data = true,
+	}
+};
+
+/* USART_SR (F4) / USART_ISR (F7) */
+#define USART_SR_PE		BIT(0)
+#define USART_SR_FE		BIT(1)
+#define USART_SR_NF		BIT(2)
+#define USART_SR_ORE		BIT(3)
+#define USART_SR_IDLE		BIT(4)
+#define USART_SR_RXNE		BIT(5)
+#define USART_SR_TC		BIT(6)
+#define USART_SR_TXE		BIT(7)
+#define USART_SR_LBD		BIT(8)
+#define USART_SR_CTSIF		BIT(9)
+#define USART_SR_CTS		BIT(10)		/* F7 */
+#define USART_SR_RTOF		BIT(11)		/* F7 */
+#define USART_SR_EOBF		BIT(12)		/* F7 */
+#define USART_SR_ABRE		BIT(14)		/* F7 */
+#define USART_SR_ABRF		BIT(15)		/* F7 */
+#define USART_SR_BUSY		BIT(16)		/* F7 */
+#define USART_SR_CMF		BIT(17)		/* F7 */
+#define USART_SR_SBKF		BIT(18)		/* F7 */
+#define USART_SR_TEACK		BIT(21)		/* F7 */
+#define USART_SR_ERR_MASK	(USART_SR_LBD | USART_SR_ORE | \
+				 USART_SR_FE | USART_SR_PE)
+/* Dummy bits */
+#define USART_SR_DUMMY_RX	BIT(16)
+
+/* USART_DR */
+#define USART_DR_MASK		GENMASK(8, 0)
+
+/* USART_BRR */
+#define USART_BRR_DIV_F_MASK	GENMASK(3, 0)
+#define USART_BRR_DIV_M_MASK	GENMASK(15, 4)
+#define USART_BRR_DIV_M_SHIFT	4
+
+/* USART_CR1 */
+#define USART_CR1_SBK		BIT(0)
+#define USART_CR1_RWU		BIT(1)		/* F4 */
+#define USART_CR1_RE		BIT(2)
+#define USART_CR1_TE		BIT(3)
+#define USART_CR1_IDLEIE	BIT(4)
+#define USART_CR1_RXNEIE	BIT(5)
+#define USART_CR1_TCIE		BIT(6)
+#define USART_CR1_TXEIE		BIT(7)
+#define USART_CR1_PEIE		BIT(8)
+#define USART_CR1_PS		BIT(9)
+#define USART_CR1_PCE		BIT(10)
+#define USART_CR1_WAKE		BIT(11)
+#define USART_CR1_M		BIT(12)
+#define USART_CR1_M0		BIT(12)		/* F7 */
+#define USART_CR1_MME		BIT(13)		/* F7 */
+#define USART_CR1_CMIE		BIT(14)		/* F7 */
+#define USART_CR1_OVER8		BIT(15)
+#define USART_CR1_DEDT_MASK	GENMASK(20, 16)	/* F7 */
+#define USART_CR1_DEAT_MASK	GENMASK(25, 21)	/* F7 */
+#define USART_CR1_RTOIE		BIT(26)		/* F7 */
+#define USART_CR1_EOBIE		BIT(27)		/* F7 */
+#define USART_CR1_M1		BIT(28)		/* F7 */
+#define USART_CR1_IE_MASK	(GENMASK(8, 4) | BIT(14) | BIT(26) | BIT(27))
+
+/* USART_CR2 */
+#define USART_CR2_ADD_MASK	GENMASK(3, 0)	/* F4 */
+#define USART_CR2_ADDM7		BIT(4)		/* F7 */
+#define USART_CR2_LBDL		BIT(5)
+#define USART_CR2_LBDIE		BIT(6)
+#define USART_CR2_LBCL		BIT(8)
+#define USART_CR2_CPHA		BIT(9)
+#define USART_CR2_CPOL		BIT(10)
+#define USART_CR2_CLKEN		BIT(11)
+#define USART_CR2_STOP_2B	BIT(13)
+#define USART_CR2_STOP_MASK	GENMASK(13, 12)
+#define USART_CR2_LINEN		BIT(14)
+#define USART_CR2_SWAP		BIT(15)		/* F7 */
+#define USART_CR2_RXINV		BIT(16)		/* F7 */
+#define USART_CR2_TXINV		BIT(17)		/* F7 */
+#define USART_CR2_DATAINV	BIT(18)		/* F7 */
+#define USART_CR2_MSBFIRST	BIT(19)		/* F7 */
+#define USART_CR2_ABREN		BIT(20)		/* F7 */
+#define USART_CR2_ABRMOD_MASK	GENMASK(22, 21)	/* F7 */
+#define USART_CR2_RTOEN		BIT(23)		/* F7 */
+#define USART_CR2_ADD_F7_MASK	GENMASK(31, 24)	/* F7 */
+
+/* USART_CR3 */
+#define USART_CR3_EIE		BIT(0)
+#define USART_CR3_IREN		BIT(1)
+#define USART_CR3_IRLP		BIT(2)
+#define USART_CR3_HDSEL		BIT(3)
+#define USART_CR3_NACK		BIT(4)
+#define USART_CR3_SCEN		BIT(5)
+#define USART_CR3_DMAR		BIT(6)
+#define USART_CR3_DMAT		BIT(7)
+#define USART_CR3_RTSE		BIT(8)
+#define USART_CR3_CTSE		BIT(9)
+#define USART_CR3_CTSIE		BIT(10)
+#define USART_CR3_ONEBIT	BIT(11)
+#define USART_CR3_OVRDIS	BIT(12)		/* F7 */
+#define USART_CR3_DDRE		BIT(13)		/* F7 */
+#define USART_CR3_DEM		BIT(14)		/* F7 */
+#define USART_CR3_DEP		BIT(15)		/* F7 */
+#define USART_CR3_SCARCNT_MASK	GENMASK(19, 17)	/* F7 */
+
+/* USART_GTPR */
+#define USART_GTPR_PSC_MASK	GENMASK(7, 0)
+#define USART_GTPR_GT_MASK	GENMASK(15, 8)
+
+/* USART_RTOR */
+#define USART_RTOR_RTO_MASK	GENMASK(23, 0)	/* F7 */
+#define USART_RTOR_BLEN_MASK	GENMASK(31, 24)	/* F7 */
+
+/* USART_RQR */
+#define USART_RQR_ABRRQ		BIT(0)		/* F7 */
+#define USART_RQR_SBKRQ		BIT(1)		/* F7 */
+#define USART_RQR_MMRQ		BIT(2)		/* F7 */
+#define USART_RQR_RXFRQ		BIT(3)		/* F7 */
+#define USART_RQR_TXFRQ		BIT(4)		/* F7 */
+
+/* USART_ICR */
+#define USART_ICR_PECF		BIT(0)		/* F7 */
+#define USART_ICR_FFECF		BIT(1)		/* F7 */
+#define USART_ICR_NCF		BIT(2)		/* F7 */
+#define USART_ICR_ORECF		BIT(3)		/* F7 */
+#define USART_ICR_IDLECF	BIT(4)		/* F7 */
+#define USART_ICR_TCCF		BIT(6)		/* F7 */
+#define USART_ICR_LBDCF		BIT(8)		/* F7 */
+#define USART_ICR_CTSCF		BIT(9)		/* F7 */
+#define USART_ICR_RTOCF		BIT(11)		/* F7 */
+#define USART_ICR_EOBCF		BIT(12)		/* F7 */
+#define USART_ICR_CMCF		BIT(17)		/* F7 */
+
+#define STM32_SERIAL_NAME "ttyS"
+#define STM32_MAX_PORTS 6
+
+struct stm32_port {
+	struct uart_port port;
+	struct clk *clk;
+	struct stm32_usart_info *info;
+	bool hw_flow_control;
+};
+
+static struct stm32_port stm32_ports[STM32_MAX_PORTS];
+static struct uart_driver stm32_usart_driver;