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[PATCH 0/9] Add support for STM32H7 serial

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  [PATCH 0/9] Add support for STM32H7 serial Bich HEMON <bich.hemon@st.com> - 2017-07-13 17:10 +0200
    [PATCH 4/9] serial: stm32: fix pio transmit timeout Bich HEMON <bich.hemon@st.com> - 2017-07-13 17:10 +0200
    [PATCH 1/9] serial: stm32: fix copyright Bich HEMON <bich.hemon@st.com> - 2017-07-13 17:20 +0200
    [PATCH 3/9] serial: stm32: Increase maximum number of ports Bich HEMON <bich.hemon@st.com> - 2017-07-13 17:20 +0200
    [PATCH 6/9] serial: stm32: fix error handling in probe Bich HEMON <bich.hemon@st.com> - 2017-07-13 17:20 +0200
    [PATCH 5/9] serial: stm32: add RTS support Bich HEMON <bich.hemon@st.com> - 2017-07-13 17:20 +0200
    [PATCH 8/9] serial: stm32: add wakeup mechanism Bich HEMON <bich.hemon@st.com> - 2017-07-13 17:20 +0200
    [PATCH 9/9] serial: stm32: add fifo support Bich HEMON <bich.hemon@st.com> - 2017-07-13 17:20 +0200
    [PATCH 7/9] dt-bindings: serial: add compatible for stm32h7 Bich HEMON <bich.hemon@st.com> - 2017-07-13 17:20 +0200
      Re: [PATCH 7/9] dt-bindings: serial: add compatible for stm32h7 Rob Herring <robh@kernel.org> - 2017-07-17 20:50 +0200

#1686608 — [PATCH 0/9] Add support for STM32H7 serial

This patchset updates existing stm32 usart driver:
- Misc fixes: copyright, mutliport management and timeout issue
- Add support for STM32H7
- Add support for wake-up and fifo management (for STM32H7)

Bich Hemon (2):
  serial: stm32: fix copyright
  serial: stm32: add RTS support

Fabrice Gasnier (3):
  serial: stm32: fix error handling in probe
  dt-bindings: serial: add compatible for stm32h7
  serial: stm32: add wakeup mechanism

Gerald Baeza (4):
  serial: stm32: fix multi-ports management
  serial: stm32: Increase maximum number of ports
  serial: stm32: fix pio transmit timeout
  serial: stm32: add fifo support

 .../devicetree/bindings/serial/st,stm32-usart.txt  |  17 ++-
 drivers/tty/serial/stm32-usart.c                   | 123 +++++++++++++++++++--
 drivers/tty/serial/stm32-usart.h                   |  37 ++++++-
 3 files changed, 162 insertions(+), 15 deletions(-)

-- 
1.9.1

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#1686610 — [PATCH 4/9] serial: stm32: fix pio transmit timeout

From: Gerald Baeza <gerald.baeza@st.com>

100µs was too short for low speed transmission
(9600bps)

Signed-off-by: Gerald Baeza <gerald.baeza@st.com>
Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 drivers/tty/serial/stm32-usart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index a12d79c..ca61bfe 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -202,7 +202,7 @@ static void stm32_transmit_chars_pio(struct uart_port *port)
 	ret = readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr,
 						isr,
 						(isr & USART_SR_TXE),
-						10, 100);
+						10, 100000);
 
 	if (ret)
 		dev_err(port->dev, "tx empty not set\n");
-- 
1.9.1

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#1686611 — [PATCH 1/9] serial: stm32: fix copyright

Fix missing copyright for STMicroelectronics

Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 drivers/tty/serial/stm32-usart.c | 1 +
 drivers/tty/serial/stm32-usart.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 0338562..ebc49e4 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) Maxime Coquelin 2015
+ * Copyright (C) STMicroelectronics SA 2017
  * Authors:  Maxime Coquelin <mcoquelin.stm32@gmail.com>
  *	     Gerald Baeza <gerald.baeza@st.com>
  * License terms:  GNU General Public License (GPL), version 2
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index cd97ceb..0532b2f 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) Maxime Coquelin 2015
+ * Copyright (C) STMicroelectronics SA 2017
  * Authors:  Maxime Coquelin <mcoquelin.stm32@gmail.com>
  *	     Gerald Baeza <gerald_baeza@yahoo.fr>
  * License terms:  GNU General Public License (GPL), version 2
-- 
1.9.1

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#1686614 — [PATCH 3/9] serial: stm32: Increase maximum number of ports

From: Gerald Baeza <gerald.baeza@st.com>

Increase max number of ports for stm32h7
which supports up to 8 uart and usart instances.

Signed-off-by: Gerald Baeza <gerald.baeza@st.com>
Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 drivers/tty/serial/stm32-usart.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index 65b4ffa..6092789 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -206,7 +206,7 @@ struct stm32_usart_info stm32f7_info = {
 #define USART_ICR_CMCF		BIT(17)		/* F7 */
 
 #define STM32_SERIAL_NAME "ttyS"
-#define STM32_MAX_PORTS 6
+#define STM32_MAX_PORTS 8
 
 #define RX_BUF_L 200		 /* dma rx buffer length     */
 #define RX_BUF_P RX_BUF_L	 /* dma rx buffer period     */
-- 
1.9.1

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#1686617 — [PATCH 6/9] serial: stm32: fix error handling in probe

From: Fabrice Gasnier <fabrice.gasnier@st.com>

Disable clock properly in case of error.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 drivers/tty/serial/stm32-usart.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 9158d31..413ff49 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -678,8 +678,10 @@ static int stm32_init_port(struct stm32_port *stm32port,
 		return ret;
 
 	stm32port->port.uartclk = clk_get_rate(stm32port->clk);
-	if (!stm32port->port.uartclk)
+	if (!stm32port->port.uartclk) {
+		clk_disable_unprepare(stm32port->clk);
 		ret = -EINVAL;
+	}
 
 	return ret;
 }
@@ -865,7 +867,7 @@ static int stm32_serial_probe(struct platform_device *pdev)
 
 	ret = uart_add_one_port(&stm32_usart_driver, &stm32port->port);
 	if (ret)
-		return ret;
+		goto err_uninit;
 
 	ret = stm32_of_dma_rx_probe(stm32port, pdev);
 	if (ret)
@@ -878,6 +880,11 @@ static int stm32_serial_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, &stm32port->port);
 
 	return 0;
+
+err_uninit:
+	clk_disable_unprepare(stm32port->clk);
+
+	return ret;
 }
 
 static int stm32_serial_remove(struct platform_device *pdev)
-- 
1.9.1

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#1686619 — [PATCH 5/9] serial: stm32: add RTS support

Implement support of RTS in USART control register

Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 drivers/tty/serial/stm32-usart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index ca61bfe..9158d31 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -518,7 +518,7 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
 	port->status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS);
 	if (cflag & CRTSCTS) {
 		port->status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
-		cr3 |= USART_CR3_CTSE;
+		cr3 |= USART_CR3_CTSE | USART_CR3_RTSE;
 	}
 
 	usartdiv = DIV_ROUND_CLOSEST(port->uartclk, baud);
-- 
1.9.1

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#1686621 — [PATCH 8/9] serial: stm32: add wakeup mechanism

From: Fabrice Gasnier <fabrice.gasnier@st.com>

Add support for wake-up from low power modes. This extends stm32f7.
Introduce new compatible for stm32h7 to manage wake-up capability.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 drivers/tty/serial/stm32-usart.c | 90 +++++++++++++++++++++++++++++++++++++++-
 drivers/tty/serial/stm32-usart.h | 29 +++++++++++++
 2 files changed, 118 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 413ff49..684cbe3 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -26,6 +26,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
 #include <linux/spinlock.h>
@@ -326,6 +327,10 @@ static irqreturn_t stm32_interrupt(int irq, void *ptr)
 
 	sr = readl_relaxed(port->membase + ofs->isr);
 
+	if ((sr & USART_SR_WUF) && (ofs->icr != UNDEF_REG))
+		writel_relaxed(USART_ICR_WUCF,
+			       port->membase + ofs->icr);
+
 	if ((sr & USART_SR_RXNE) && !(stm32_port->rx_ch))
 		stm32_receive_chars(port, false);
 
@@ -442,6 +447,7 @@ static int stm32_startup(struct uart_port *port)
 {
 	struct stm32_port *stm32_port = to_stm32_port(port);
 	struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+	struct stm32_usart_config *cfg = &stm32_port->info->cfg;
 	const char *name = to_platform_device(port->dev)->name;
 	u32 val;
 	int ret;
@@ -452,6 +458,15 @@ static int stm32_startup(struct uart_port *port)
 	if (ret)
 		return ret;
 
+	if (cfg->has_wakeup && stm32_port->wakeirq >= 0) {
+		ret = dev_pm_set_dedicated_wake_irq(port->dev,
+						    stm32_port->wakeirq);
+		if (ret) {
+			free_irq(port->irq, port);
+			return ret;
+		}
+	}
+
 	val = USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
 	stm32_set_bits(port, ofs->cr1, val);
 
@@ -469,6 +484,7 @@ static void stm32_shutdown(struct uart_port *port)
 	val |= BIT(cfg->uart_enable_bit);
 	stm32_clr_bits(port, ofs->cr1, val);
 
+	dev_pm_clear_wake_irq(port->dev);
 	free_irq(port->irq, port);
 }
 
@@ -659,6 +675,7 @@ static int stm32_init_port(struct stm32_port *stm32port,
 	port->ops	= &stm32_uart_ops;
 	port->dev	= &pdev->dev;
 	port->irq	= platform_get_irq(pdev, 0);
+	stm32port->wakeirq = platform_get_irq(pdev, 1);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	port->membase = devm_ioremap_resource(&pdev->dev, res);
@@ -716,6 +733,8 @@ static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
 	{ .compatible = "st,stm32-uart", .data = &stm32f4_info},
 	{ .compatible = "st,stm32f7-usart", .data = &stm32f7_info},
 	{ .compatible = "st,stm32f7-uart", .data = &stm32f7_info},
+	{ .compatible = "st,stm32h7-usart", .data = &stm32h7_info},
+	{ .compatible = "st,stm32h7-uart", .data = &stm32h7_info},
 	{},
 };
 
@@ -865,9 +884,15 @@ static int stm32_serial_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	if (stm32port->info->cfg.has_wakeup && stm32port->wakeirq >= 0) {
+		ret = device_init_wakeup(&pdev->dev, true);
+		if (ret)
+			goto err_uninit;
+	}
+
 	ret = uart_add_one_port(&stm32_usart_driver, &stm32port->port);
 	if (ret)
-		goto err_uninit;
+		goto err_nowup;
 
 	ret = stm32_of_dma_rx_probe(stm32port, pdev);
 	if (ret)
@@ -881,6 +906,10 @@ static int stm32_serial_probe(struct platform_device *pdev)
 
 	return 0;
 
+err_nowup:
+	if (stm32port->info->cfg.has_wakeup && stm32port->wakeirq >= 0)
+		device_init_wakeup(&pdev->dev, false);
+
 err_uninit:
 	clk_disable_unprepare(stm32port->clk);
 
@@ -892,6 +921,7 @@ static int stm32_serial_remove(struct platform_device *pdev)
 	struct uart_port *port = platform_get_drvdata(pdev);
 	struct stm32_port *stm32_port = to_stm32_port(port);
 	struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+	struct stm32_usart_config *cfg = &stm32_port->info->cfg;
 
 	stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAR);
 
@@ -913,6 +943,9 @@ static int stm32_serial_remove(struct platform_device *pdev)
 				  TX_BUF_L, stm32_port->tx_buf,
 				  stm32_port->tx_dma_buf);
 
+	if (cfg->has_wakeup && stm32_port->wakeirq >= 0)
+		device_init_wakeup(&pdev->dev, false);
+
 	clk_disable_unprepare(stm32_port->clk);
 
 	return uart_remove_one_port(&stm32_usart_driver, port);
@@ -1018,11 +1051,66 @@ static int stm32_console_setup(struct console *co, char *options)
 	.cons		= STM32_SERIAL_CONSOLE,
 };
 
+#ifdef CONFIG_PM_SLEEP
+static void stm32_serial_enable_wakeup(struct uart_port *port, bool enable)
+{
+	struct stm32_port *stm32_port = to_stm32_port(port);
+	struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+	struct stm32_usart_config *cfg = &stm32_port->info->cfg;
+	u32 val;
+
+	if (!cfg->has_wakeup || stm32_port->wakeirq < 0)
+		return;
+
+	if (enable) {
+		stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+		stm32_set_bits(port, ofs->cr1, USART_CR1_UESM);
+		val = readl_relaxed(port->membase + ofs->cr3);
+		val &= ~USART_CR3_WUS_MASK;
+		/* Enable Wake up interrupt from low power on start bit */
+		val |= USART_CR3_WUS_START_BIT | USART_CR3_WUFIE;
+		writel_relaxed(val, port->membase + ofs->cr3);
+		stm32_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+	} else {
+		stm32_clr_bits(port, ofs->cr1, USART_CR1_UESM);
+	}
+}
+
+static int stm32_serial_suspend(struct device *dev)
+{
+	struct uart_port *port = dev_get_drvdata(dev);
+
+	uart_suspend_port(&stm32_usart_driver, port);
+
+	if (device_may_wakeup(dev))
+		stm32_serial_enable_wakeup(port, true);
+	else
+		stm32_serial_enable_wakeup(port, false);
+
+	return 0;
+}
+
+static int stm32_serial_resume(struct device *dev)
+{
+	struct uart_port *port = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		stm32_serial_enable_wakeup(port, false);
+
+	return uart_resume_port(&stm32_usart_driver, port);
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops stm32_serial_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(stm32_serial_suspend, stm32_serial_resume)
+};
+
 static struct platform_driver stm32_serial_driver = {
 	.probe		= stm32_serial_probe,
 	.remove		= stm32_serial_remove,
 	.driver	= {
 		.name	= DRIVER_NAME,
+		.pm	= &stm32_serial_pm_ops,
 		.of_match_table = of_match_ptr(stm32_match),
 	},
 };
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index 6092789..5984a66 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -25,6 +25,7 @@ struct stm32_usart_offsets {
 struct stm32_usart_config {
 	u8 uart_enable_bit; /* USART_CR1_UE */
 	bool has_7bits_data;
+	bool has_wakeup;
 };
 
 struct stm32_usart_info {
@@ -75,6 +76,27 @@ struct stm32_usart_info stm32f7_info = {
 	}
 };
 
+struct stm32_usart_info stm32h7_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,
+		.has_wakeup = true,
+	}
+};
+
 /* USART_SR (F4) / USART_ISR (F7) */
 #define USART_SR_PE		BIT(0)
 #define USART_SR_FE		BIT(1)
@@ -94,6 +116,7 @@ struct stm32_usart_info stm32f7_info = {
 #define USART_SR_BUSY		BIT(16)		/* F7 */
 #define USART_SR_CMF		BIT(17)		/* F7 */
 #define USART_SR_SBKF		BIT(18)		/* F7 */
+#define USART_SR_WUF		BIT(20)		/* H7 */
 #define USART_SR_TEACK		BIT(21)		/* F7 */
 #define USART_SR_ERR_MASK	(USART_SR_LBD | USART_SR_ORE | \
 				 USART_SR_FE | USART_SR_PE)
@@ -114,6 +137,7 @@ struct stm32_usart_info stm32f7_info = {
 /* USART_CR1 */
 #define USART_CR1_SBK		BIT(0)
 #define USART_CR1_RWU		BIT(1)		/* F4 */
+#define USART_CR1_UESM		BIT(1)		/* H7 */
 #define USART_CR1_RE		BIT(2)
 #define USART_CR1_TE		BIT(3)
 #define USART_CR1_IDLEIE	BIT(4)
@@ -176,6 +200,9 @@ struct stm32_usart_info stm32f7_info = {
 #define USART_CR3_DEM		BIT(14)		/* F7 */
 #define USART_CR3_DEP		BIT(15)		/* F7 */
 #define USART_CR3_SCARCNT_MASK	GENMASK(19, 17)	/* F7 */
+#define USART_CR3_WUS_MASK	GENMASK(21, 20)	/* H7 */
+#define USART_CR3_WUS_START_BIT	BIT(21)		/* H7 */
+#define USART_CR3_WUFIE		BIT(22)		/* H7 */
 
 /* USART_GTPR */
 #define USART_GTPR_PSC_MASK	GENMASK(7, 0)
@@ -204,6 +231,7 @@ struct stm32_usart_info stm32f7_info = {
 #define USART_ICR_RTOCF		BIT(11)		/* F7 */
 #define USART_ICR_EOBCF		BIT(12)		/* F7 */
 #define USART_ICR_CMCF		BIT(17)		/* F7 */
+#define USART_ICR_WUCF		BIT(20)		/* H7 */
 
 #define STM32_SERIAL_NAME "ttyS"
 #define STM32_MAX_PORTS 8
@@ -225,6 +253,7 @@ struct stm32_port {
 	int last_res;
 	bool tx_dma_busy;	 /* dma tx busy               */
 	bool hw_flow_control;
+	int wakeirq;
 };
 
 static struct stm32_port stm32_ports[STM32_MAX_PORTS];
-- 
1.9.1

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#1686623 — [PATCH 9/9] serial: stm32: add fifo support

From: Gerald Baeza <gerald.baeza@st.com>

This patch adds fifo mode support for rx and tx.

A fifo configuration is set in each port structure.
Add has_fifo flag to usart configuration to use fifo only when possible.

Signed-off-by: Gerald Baeza <gerald.baeza@st.com>
Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 drivers/tty/serial/stm32-usart.c | 7 +++++++
 drivers/tty/serial/stm32-usart.h | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 684cbe3..b16e7e7 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -468,6 +468,8 @@ static int stm32_startup(struct uart_port *port)
 	}
 
 	val = USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
+	if (stm32_port->fifoen)
+		val |= USART_CR1_FIFOEN;
 	stm32_set_bits(port, ofs->cr1, val);
 
 	return 0;
@@ -482,6 +484,8 @@ static void stm32_shutdown(struct uart_port *port)
 
 	val = USART_CR1_TXEIE | USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
 	val |= BIT(cfg->uart_enable_bit);
+	if (stm32_port->fifoen)
+		val |= USART_CR1_FIFOEN;
 	stm32_clr_bits(port, ofs->cr1, val);
 
 	dev_pm_clear_wake_irq(port->dev);
@@ -512,6 +516,8 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
 
 	cr1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;
 	cr1 |= BIT(cfg->uart_enable_bit);
+	if (stm32_port->fifoen)
+		cr1 |= USART_CR1_FIFOEN;
 	cr2 = 0;
 	cr3 = 0;
 
@@ -676,6 +682,7 @@ static int stm32_init_port(struct stm32_port *stm32port,
 	port->dev	= &pdev->dev;
 	port->irq	= platform_get_irq(pdev, 0);
 	stm32port->wakeirq = platform_get_irq(pdev, 1);
+	stm32port->fifoen = stm32port->info->cfg.has_fifo;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	port->membase = devm_ioremap_resource(&pdev->dev, res);
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index 5984a66..ffc0c52 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -26,6 +26,7 @@ struct stm32_usart_config {
 	u8 uart_enable_bit; /* USART_CR1_UE */
 	bool has_7bits_data;
 	bool has_wakeup;
+	bool has_fifo;
 };
 
 struct stm32_usart_info {
@@ -94,6 +95,7 @@ struct stm32_usart_info stm32h7_info = {
 		.uart_enable_bit = 0,
 		.has_7bits_data = true,
 		.has_wakeup = true,
+		.has_fifo = true,
 	}
 };
 
@@ -159,6 +161,7 @@ struct stm32_usart_info stm32h7_info = {
 #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))
+#define USART_CR1_FIFOEN	BIT(29)		/* H7 */
 
 /* USART_CR2 */
 #define USART_CR2_ADD_MASK	GENMASK(3, 0)	/* F4 */
@@ -253,6 +256,7 @@ struct stm32_port {
 	int last_res;
 	bool tx_dma_busy;	 /* dma tx busy               */
 	bool hw_flow_control;
+	bool fifoen;
 	int wakeirq;
 };
 
-- 
1.9.1

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#1686625 — [PATCH 7/9] dt-bindings: serial: add compatible for stm32h7

From: Fabrice Gasnier <fabrice.gasnier@st.com>

Introduce new compatibles for "st,stm32h7-usart" and "st,stm32h7-uart".
This new compatible allow to use optional wake-up interrupt.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Bich Hemon <bich.hemon@st.com>
---
 .../devicetree/bindings/serial/st,stm32-usart.txt       | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/serial/st,stm32-usart.txt b/Documentation/devicetree/bindings/serial/st,stm32-usart.txt
index 85ec5f2..3657f9f 100644
--- a/Documentation/devicetree/bindings/serial/st,stm32-usart.txt
+++ b/Documentation/devicetree/bindings/serial/st,stm32-usart.txt
@@ -1,12 +1,19 @@
 * STMicroelectronics STM32 USART
 
 Required properties:
-- compatible: Can be either "st,stm32-usart", "st,stm32-uart",
-"st,stm32f7-usart" or "st,stm32f7-uart" depending on whether
-the device supports synchronous mode and is compatible with
-stm32(f4) or stm32f7.
+- compatible: can be either:
+  - "st,stm32-usart",
+  - "st,stm32-uart",
+  - "st,stm32f7-usart",
+  - "st,stm32f7-uart",
+  - "st,stm32h7-usart"
+  - "st,stm32h7-uart".
+  depending on whether the device supports synchronous mode
+  and is compatible with stm32(f4), stm32f7 or stm32h7.
 - reg: The address and length of the peripheral registers space
-- interrupts: The interrupt line of the USART instance
+- interrupts:
+  - The interrupt line for the USART instance,
+  - An optional wake-up interrupt.
 - clocks: The input clock of the USART instance
 
 Optional properties:
-- 
1.9.1

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#1689346 — Re: [PATCH 7/9] dt-bindings: serial: add compatible for stm32h7

On Thu, Jul 13, 2017 at 03:08:29PM +0000, Bich HEMON wrote:
> From: Fabrice Gasnier <fabrice.gasnier@st.com>
> 
> Introduce new compatibles for "st,stm32h7-usart" and "st,stm32h7-uart".
> This new compatible allow to use optional wake-up interrupt.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
> Signed-off-by: Bich Hemon <bich.hemon@st.com>
> ---
>  .../devicetree/bindings/serial/st,stm32-usart.txt       | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)

Acked-by: Rob Herring <robh@kernel.org>

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