diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 50abb60..7d97a26 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -39,6 +39,9 @@
 #include <linux/of_device.h>
 #include <linux/io.h>
 #include <linux/dma-mapping.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_wakeup.h>
 
 #include <asm/irq.h>
 #include <linux/platform_data/serial-imx.h>
@@ -219,6 +222,7 @@ struct imx_port {
 	unsigned int            saved_reg[10];
 	bool			context_saved;
 
+	struct device		*dev;
 	bool			is_suspending;
 };
 
@@ -369,6 +373,7 @@ static void imx_stop_tx(struct uart_port *port)
 	if (sport->dma_is_enabled && sport->dma_is_txing)
 		return;
 
+	pm_runtime_get_sync(sport->dev);
 	temp = readl(port->membase + UCR1);
 	writel(temp & ~UCR1_TXMPTYEN, port->membase + UCR1);
 
@@ -386,6 +391,8 @@ static void imx_stop_tx(struct uart_port *port)
 		temp &= ~UCR4_TCEN;
 		writel(temp, port->membase + UCR4);
 	}
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 /*
@@ -405,12 +412,15 @@ static void imx_stop_rx(struct uart_port *port)
 		}
 	}
 
+	pm_runtime_get_sync(sport->dev);
 	temp = readl(sport->port.membase + UCR2);
 	writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2);
 
 	/* disable the `Receiver Ready Interrrupt` */
 	temp = readl(sport->port.membase + UCR1);
 	writel(temp & ~UCR1_RRDYEN, sport->port.membase + UCR1);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 /*
@@ -482,6 +492,7 @@ static void dma_tx_callback(void *data)
 	unsigned long flags;
 	unsigned long temp;
 
+	pm_runtime_get_sync(sport->dev);
 	spin_lock_irqsave(&sport->port.lock, flags);
 
 	dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
@@ -506,13 +517,17 @@ static void dma_tx_callback(void *data)
 	if (waitqueue_active(&sport->dma_wait)) {
 		wake_up(&sport->dma_wait);
 		dev_dbg(sport->port.dev, "exit in %s.\n", __func__);
-		return;
+		goto mark_last;
 	}
 
 	spin_lock_irqsave(&sport->port.lock, flags);
 	if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port))
 		imx_dma_tx(sport);
 	spin_unlock_irqrestore(&sport->port.lock, flags);
+
+mark_last:
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 static void imx_dma_tx(struct imx_port *sport)
@@ -579,6 +594,7 @@ static void imx_start_tx(struct uart_port *port)
 	struct imx_port *sport = (struct imx_port *)port;
 	unsigned long temp;
 
+	pm_runtime_get_sync(sport->dev);
 	if (port->rs485.flags & SER_RS485_ENABLED) {
 		/* enable transmitter and shifter empty irq */
 		temp = readl(port->membase + UCR2);
@@ -606,14 +622,18 @@ static void imx_start_tx(struct uart_port *port)
 			temp &= ~UCR1_TDMAEN;
 			temp |= UCR1_TXMPTYEN;
 			writel(temp, sport->port.membase + UCR1);
-			return;
+			goto mark_last;
 		}
 
 		if (!uart_circ_empty(&port->state->xmit) &&
 		    !uart_tx_stopped(port))
 			imx_dma_tx(sport);
-		return;
+		goto mark_last;
 	}
+
+mark_last:
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 static irqreturn_t imx_rtsint(int irq, void *dev_id)
@@ -622,6 +642,7 @@ static irqreturn_t imx_rtsint(int irq, void *dev_id)
 	unsigned int val;
 	unsigned long flags;
 
+	pm_runtime_get_sync(sport->dev);
 	spin_lock_irqsave(&sport->port.lock, flags);
 
 	writel(USR1_RTSD, sport->port.membase + USR1);
@@ -630,6 +651,9 @@ static irqreturn_t imx_rtsint(int irq, void *dev_id)
 	wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
 
 	spin_unlock_irqrestore(&sport->port.lock, flags);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
+
 	return IRQ_HANDLED;
 }
 
@@ -638,9 +662,13 @@ static irqreturn_t imx_txint(int irq, void *dev_id)
 	struct imx_port *sport = dev_id;
 	unsigned long flags;
 
+	pm_runtime_get_sync(sport->dev);
 	spin_lock_irqsave(&sport->port.lock, flags);
 	imx_transmit_buffer(sport);
 	spin_unlock_irqrestore(&sport->port.lock, flags);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
+
 	return IRQ_HANDLED;
 }
 
@@ -651,6 +679,7 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 	struct tty_port *port = &sport->port.state->port;
 	unsigned long flags, temp;
 
+	pm_runtime_get_sync(sport->dev);
 	spin_lock_irqsave(&sport->port.lock, flags);
 
 	while (readl(sport->port.membase + USR2) & USR2_RDR) {
@@ -711,6 +740,8 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 out:
 	spin_unlock_irqrestore(&sport->port.lock, flags);
 	tty_flip_buffer_push(port);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 	return IRQ_HANDLED;
 }
 
@@ -748,6 +779,7 @@ static irqreturn_t imx_int(int irq, void *dev_id)
 	unsigned int sts;
 	unsigned int sts2;
 
+	pm_runtime_get_sync(sport->dev);
 	sts = readl(sport->port.membase + USR1);
 	sts2 = readl(sport->port.membase + USR2);
 
@@ -774,6 +806,8 @@ static irqreturn_t imx_int(int irq, void *dev_id)
 		sport->port.icount.overrun++;
 		writel(USR2_ORE, sport->port.membase + USR2);
 	}
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 
 	return IRQ_HANDLED;
 }
@@ -786,11 +820,14 @@ static unsigned int imx_tx_empty(struct uart_port *port)
 	struct imx_port *sport = (struct imx_port *)port;
 	unsigned int ret;
 
+	pm_runtime_get_sync(sport->dev);
 	ret = (readl(sport->port.membase + USR2) & USR2_TXDC) ?  TIOCSER_TEMT : 0;
 
 	/* If the TX DMA is working, return 0. */
 	if (sport->dma_is_enabled && sport->dma_is_txing)
 		ret = 0;
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 
 	return ret;
 }
@@ -803,6 +840,7 @@ static unsigned int imx_get_mctrl(struct uart_port *port)
 	struct imx_port *sport = (struct imx_port *)port;
 	unsigned int tmp = TIOCM_DSR | TIOCM_CAR;
 
+	pm_runtime_get_sync(sport->dev);
 	if (readl(sport->port.membase + USR1) & USR1_RTSS)
 		tmp |= TIOCM_CTS;
 
@@ -811,6 +849,8 @@ static unsigned int imx_get_mctrl(struct uart_port *port)
 
 	if (readl(sport->port.membase + uts_reg(sport)) & UTS_LOOP)
 		tmp |= TIOCM_LOOP;
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 
 	return tmp;
 }
@@ -820,6 +860,7 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	struct imx_port *sport = (struct imx_port *)port;
 	unsigned long temp;
 
+	pm_runtime_get_sync(sport->dev);
 	if (!(port->rs485.flags & SER_RS485_ENABLED)) {
 		temp = readl(sport->port.membase + UCR2);
 		temp &= ~(UCR2_CTS | UCR2_CTSC);
@@ -832,6 +873,8 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	if (mctrl & TIOCM_LOOP)
 		temp |= UTS_LOOP;
 	writel(temp, sport->port.membase + uts_reg(sport));
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 /*
@@ -842,6 +885,7 @@ static void imx_break_ctl(struct uart_port *port, int break_state)
 	struct imx_port *sport = (struct imx_port *)port;
 	unsigned long flags, temp;
 
+	pm_runtime_get_sync(sport->dev);
 	spin_lock_irqsave(&sport->port.lock, flags);
 
 	temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK;
@@ -852,6 +896,8 @@ static void imx_break_ctl(struct uart_port *port, int break_state)
 	writel(temp, sport->port.membase + UCR1);
 
 	spin_unlock_irqrestore(&sport->port.lock, flags);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 #define TXTL 2 /* reset default */
@@ -909,6 +955,7 @@ static void dma_rx_callback(void *data)
 	enum dma_status status;
 	unsigned int count;
 
+	pm_runtime_get_sync(sport->dev);
 	/* unmap it first */
 	dma_unmap_sg(sport->port.dev, sgl, 1, DMA_FROM_DEVICE);
 
@@ -950,6 +997,8 @@ static void dma_rx_callback(void *data)
 		 */
 		imx_rx_dma_done(sport);
 	}
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 static int start_rx_dma(struct imx_port *sport)
@@ -1105,18 +1154,10 @@ static void imx_disable_dma(struct imx_port *sport)
 static int imx_startup(struct uart_port *port)
 {
 	struct imx_port *sport = (struct imx_port *)port;
-	int retval, i;
+	int i;
 	unsigned long flags, temp;
 
-	retval = clk_prepare_enable(sport->clk_per);
-	if (retval)
-		return retval;
-	retval = clk_prepare_enable(sport->clk_ipg);
-	if (retval) {
-		clk_disable_unprepare(sport->clk_per);
-		return retval;
-	}
-
+	pm_runtime_get_sync(sport->dev);
 	imx_setup_ufcr(sport, 0);
 
 	/* disable the DREN bit (Data Ready interrupt enable) before
@@ -1173,6 +1214,8 @@ static int imx_startup(struct uart_port *port)
 	 */
 	imx_enable_ms(&sport->port);
 	spin_unlock_irqrestore(&sport->port.lock, flags);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 
 	return 0;
 }
@@ -1183,6 +1226,7 @@ static void imx_shutdown(struct uart_port *port)
 	unsigned long temp;
 	unsigned long flags;
 
+	pm_runtime_get_sync(sport->dev);
 	if (sport->dma_is_enabled) {
 		int ret;
 
@@ -1225,8 +1269,8 @@ static void imx_shutdown(struct uart_port *port)
 	writel(temp, sport->port.membase + UCR1);
 	spin_unlock_irqrestore(&sport->port.lock, flags);
 
-	clk_disable_unprepare(sport->clk_per);
-	clk_disable_unprepare(sport->clk_ipg);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 static void imx_flush_buffer(struct uart_port *port)
@@ -1239,6 +1283,7 @@ static void imx_flush_buffer(struct uart_port *port)
 	if (!sport->dma_chan_tx)
 		return;
 
+	pm_runtime_get_sync(sport->dev);
 	sport->tx_bytes = 0;
 	dmaengine_terminate_all(sport->dma_chan_tx);
 	if (sport->dma_is_txing) {
@@ -1272,6 +1317,8 @@ static void imx_flush_buffer(struct uart_port *port)
 	writel(ubir, sport->port.membase + UBIR);
 	writel(ubmr, sport->port.membase + UBMR);
 	writel(uts, sport->port.membase + IMX21_UTS);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 static void
@@ -1286,6 +1333,7 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
 	unsigned long num, denom;
 	uint64_t tdiv64;
 
+	pm_runtime_get_sync(sport->dev);
 	/*
 	 * We only support CS7 and CS8.
 	 */
@@ -1441,6 +1489,8 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
 	if (sport->dma_is_inited && !sport->dma_is_enabled)
 		imx_enable_dma(sport);
 	spin_unlock_irqrestore(&sport->port.lock, flags);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 static const char *imx_type(struct uart_port *port)
@@ -1498,13 +1548,7 @@ static int imx_poll_init(struct uart_port *port)
 	unsigned long temp;
 	int retval;
 
-	retval = clk_prepare_enable(sport->clk_ipg);
-	if (retval)
-		return retval;
-	retval = clk_prepare_enable(sport->clk_per);
-	if (retval)
-		clk_disable_unprepare(sport->clk_ipg);
-
+	pm_runtime_get_sync(sport->dev);
 	imx_setup_ufcr(sport, 0);
 
 	spin_lock_irqsave(&sport->port.lock, flags);
@@ -1521,22 +1565,34 @@ static int imx_poll_init(struct uart_port *port)
 	writel(temp, sport->port.membase + UCR2);
 
 	spin_unlock_irqrestore(&sport->port.lock, flags);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 
 	return 0;
 }
 
 static int imx_poll_get_char(struct uart_port *port)
 {
-	if (!(readl_relaxed(port->membase + USR2) & USR2_RDR))
-		return NO_POLL_CHAR;
+	int ret;
+
+	pm_runtime_get_sync(sport->dev);
+	if (!(readl_relaxed(port->membase + USR2) & USR2_RDR)) {
+		ret = NO_POLL_CHAR;
+		goto mark_last;
+	}
 
-	return readl_relaxed(port->membase + URXD0) & URXD_RX_DATA;
+	ret = readl_relaxed(port->membase + URXD0) & URXD_RX_DATA;
+
+mark_last:
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 static void imx_poll_put_char(struct uart_port *port, unsigned char c)
 {
 	unsigned int status;
 
+	pm_runtime_get_sync(sport->dev);
 	/* drain */
 	do {
 		status = readl_relaxed(port->membase + USR1);
@@ -1549,6 +1605,8 @@ static void imx_poll_put_char(struct uart_port *port, unsigned char c)
 	do {
 		status = readl_relaxed(port->membase + USR2);
 	} while (~status & USR2_TXDC);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 #endif
 
@@ -1569,6 +1627,7 @@ static int imx_rs485_config(struct uart_port *port,
 	if (rs485conf->flags & SER_RS485_ENABLED) {
 		unsigned long temp;
 
+		pm_runtime_get_sync(sport->dev);
 		/* disable transmitter */
 		temp = readl(sport->port.membase + UCR2);
 		temp &= ~UCR2_CTSC;
@@ -1577,6 +1636,8 @@ static int imx_rs485_config(struct uart_port *port,
 		else
 			temp |= UCR2_CTS;
 		writel(temp, sport->port.membase + UCR2);
+		pm_runtime_mark_last_busy(sport->dev);
+		pm_runtime_put_autosuspend(sport->dev);
 	}
 
 	port->rs485 = *rs485conf;
@@ -1631,17 +1692,8 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
 	unsigned int ucr1;
 	unsigned long flags = 0;
 	int locked = 1;
-	int retval;
-
-	retval = clk_prepare_enable(sport->clk_per);
-	if (retval)
-		return;
-	retval = clk_prepare_enable(sport->clk_ipg);
-	if (retval) {
-		clk_disable_unprepare(sport->clk_per);
-		return;
-	}
 
+	pm_runtime_get_sync(sport->dev);
 	if (sport->port.sysrq)
 		locked = 0;
 	else if (oops_in_progress)
@@ -1677,8 +1729,8 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
 	if (locked)
 		spin_unlock_irqrestore(&sport->port.lock, flags);
 
-	clk_disable_unprepare(sport->clk_ipg);
-	clk_disable_unprepare(sport->clk_per);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 }
 
 /*
@@ -1765,10 +1817,7 @@ imx_console_setup(struct console *co, char *options)
 	if (sport == NULL)
 		return -ENODEV;
 
-	/* For setting the registers, we only need to enable the ipg clock. */
-	retval = clk_prepare_enable(sport->clk_ipg);
-	if (retval)
-		goto error_console;
+	pm_runtime_get_sync(sport->dev);
 
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
@@ -1779,9 +1828,8 @@ imx_console_setup(struct console *co, char *options)
 
 	retval = uart_set_options(&sport->port, co, baud, parity, bits, flow);
 
-	clk_disable_unprepare(sport->clk_ipg);
-
-error_console:
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
 	return retval;
 }
 
@@ -1963,16 +2011,39 @@ static int serial_imx_probe(struct platform_device *pdev)
 
 	imx_ports[sport->port.line] = sport;
 
+	sport->dev = &pdev->dev;
 	platform_set_drvdata(pdev, sport);
 
-	return uart_add_one_port(&imx_reg, &sport->port);
+	device_init_wakeup(sport->dev, true);
+	pm_runtime_use_autosuspend(sport->dev);
+	pm_runtime_set_autosuspend_delay(sport->dev, 5000);
+
+	pm_runtime_irq_safe(sport->dev);
+	pm_runtime_enable(sport->dev);
+
+	clk_prepare(sport->clk_per);
+	clk_prepare(sport->clk_ipg);
+	pm_runtime_get_sync(sport->dev);
+	ret = uart_add_one_port(&imx_reg, &sport->port);
+	pm_runtime_mark_last_busy(sport->dev);
+	pm_runtime_put_autosuspend(sport->dev);
+
+	return ret;
 }
 
 static int serial_imx_remove(struct platform_device *pdev)
 {
 	struct imx_port *sport = platform_get_drvdata(pdev);
+	int ret;
 
-	return uart_remove_one_port(&imx_reg, &sport->port);
+	pm_runtime_put_sync(sport->dev);
+	pm_runtime_disable(sport->dev);
+	clk_unprepare(sport->clk_per);
+	clk_unprepare(sport->clk_ipg);
+	ret = uart_remove_one_port(&imx_reg, &sport->port);
+	device_init_wakeup(&pdev->dev, false);
+
+	return ret;
 }
 
 static void serial_imx_restore_context(struct imx_port *sport)
@@ -2028,6 +2099,49 @@ static void serial_imx_enable_wakeup(struct imx_port *sport, bool on)
 	writel(val, sport->port.membase + UCR1);
 }
 
+static int serial_imx_runtime_suspend(struct device *dev)
+{
+	struct imx_port *sport = dev_get_drvdata(dev);
+
+	if (!sport)
+		return -EINVAL;
+
+	/*
+	* When using 'no_console_suspend', the console UART must not be
+	* suspended. Since driver suspend is managed by runtime suspend,
+	* preventing runtime suspend (by returning error) will keep device
+	* active during suspend.
+	*/
+	if (sport->is_suspending && !console_suspend_enabled &&
+	    uart_console(&sport->port))
+		return -EBUSY;
+
+	serial_imx_save_context(sport);
+	serial_imx_enable_wakeup(sport, true);
+
+	sport->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
+	schedule_work(&sport->qos_work);
+	clk_disable(sport->clk_per);
+	clk_disable(sport->clk_ipg);
+
+	return 0;
+}
+
+static int serial_imx_runtime_resume(struct device *dev)
+{
+	struct imx_port *sport = dev_get_drvdata(dev);
+
+	clk_enable(sport->clk_per);
+	clk_enable(sport->clk_ipg);
+	serial_imx_enable_wakeup(sport, false);
+
+	sport->latency = sport->calc_latency;
+	schedule_work(&sport->qos_work);
+	serial_imx_restore_context(sport);
+
+	return 0;
+}
+
 static int serial_imx_prepare(struct device *dev)
 {
 	struct imx_port *sport = dev_get_drvdata(dev);
@@ -2087,6 +2201,8 @@ static int imx_serial_port_suspend(struct device *dev)
 	serial_imx_enable_wakeup(sport, true);
 
 	uart_suspend_port(&imx_reg, &sport->port);
+	clk_disable_unprepare(sport->clk_per);
+	clk_disable_unprepare(sport->clk_ipg);
 
 	return 0;
 }
@@ -2096,6 +2212,8 @@ static int imx_serial_port_resume(struct device *dev)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct imx_port *sport = platform_get_drvdata(pdev);
 
+	clk_prepare_enable(sport->clk_per);
+	clk_prepare_enable(sport->clk_ipg);
 	/* disable wakeup from i.MX UART */
 	serial_imx_enable_wakeup(sport, false);
 
@@ -2105,6 +2223,8 @@ static int imx_serial_port_resume(struct device *dev)
 }
 
 static const struct dev_pm_ops imx_serial_port_pm_ops = {
+	SET_RUNTIME_PM_OPS(serial_imx_runtime_suspend,
+			   serial_imx_runtime_resume, NULL)
 	.suspend_noirq = imx_serial_port_suspend_noirq,
 	.resume_noirq = imx_serial_port_resume_noirq,
 	.suspend = imx_serial_port_suspend,
