[PATCH v6] can: xilinx: Convert to runtime_pm

[PATCH v6] can: xilinx: Convert to runtime_pm

[Kedareswara rao Appana]

Instead of enabling/disabling clocks at several locations in the driver,
Use the runtime_pm framework. This consolidates the actions for runtime PM
In the appropriate callbacks and makes the driver more readable and mantainable.

Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
---
Sorry for the long delay for sending this next version of the patch.
somehow couldn't manage to send this next version of the patch.
 
Changes for v6:
 - Updated the driver with review comments as suggested by Marc.
Changes for v5:
 - Updated with the review comments.
   Updated the remove fuction to use runtime_pm.
Chnages for v4:
 - Updated with the review comments.
Changes for v3:
  - Converted the driver to use runtime_pm.
Changes for v2:
  - Removed the struct platform_device* from suspend/resume
    as suggest by Lothar.

 drivers/net/can/xilinx_can.c | 176 +++++++++++++++++++++++++++----------------
 1 file changed, 110 insertions(+), 66 deletions(-)

diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
index fc55e8e..6114214 100644
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -32,6 +32,7 @@
 #include <linux/can/dev.h>
 #include <linux/can/error.h>
 #include <linux/can/led.h>
+#include <linux/pm_runtime.h>
 
 #define DRIVER_NAME	"xilinx_can"
 
@@ -138,7 +139,7 @@ struct xcan_priv {
 	u32 (*read_reg)(const struct xcan_priv *priv, enum xcan_reg reg);
 	void (*write_reg)(const struct xcan_priv *priv, enum xcan_reg reg,
 			u32 val);
-	struct net_device *dev;
+	struct device *dev;
 	void __iomem *reg_base;
 	unsigned long irq_flags;
 	struct clk *bus_clk;
@@ -843,6 +844,13 @@ static int xcan_open(struct net_device *ndev)
 	struct xcan_priv *priv = netdev_priv(ndev);
 	int ret;
 
+	ret = pm_runtime_get_sync(priv->dev);
+	if (ret < 0) {
+		netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
+				__func__, ret);
+		return ret;
+	}
+
 	ret = request_irq(ndev->irq, xcan_interrupt, priv->irq_flags,
 			ndev->name, ndev);
 	if (ret < 0) {
@@ -850,29 +858,17 @@ static int xcan_open(struct net_device *ndev)
 		goto err;
 	}
 
-	ret = clk_prepare_enable(priv->can_clk);
-	if (ret) {
-		netdev_err(ndev, "unable to enable device clock\n");
-		goto err_irq;
-	}
-
-	ret = clk_prepare_enable(priv->bus_clk);
-	if (ret) {
-		netdev_err(ndev, "unable to enable bus clock\n");
-		goto err_can_clk;
-	}
-
 	/* Set chip into reset mode */
 	ret = set_reset_mode(ndev);
 	if (ret < 0) {
 		netdev_err(ndev, "mode resetting failed!\n");
-		goto err_bus_clk;
+		goto err_irq;
 	}
 
 	/* Common open */
 	ret = open_candev(ndev);
 	if (ret)
-		goto err_bus_clk;
+		goto err_irq;
 
 	ret = xcan_chip_start(ndev);
 	if (ret < 0) {
@@ -888,13 +884,11 @@ static int xcan_open(struct net_device *ndev)
 
 err_candev:
 	close_candev(ndev);
-err_bus_clk:
-	clk_disable_unprepare(priv->bus_clk);
-err_can_clk:
-	clk_disable_unprepare(priv->can_clk);
 err_irq:
 	free_irq(ndev->irq, ndev);
 err:
+	pm_runtime_put(priv->dev);
+
 	return ret;
 }
 
@@ -911,12 +905,11 @@ static int xcan_close(struct net_device *ndev)
 	netif_stop_queue(ndev);
 	napi_disable(&priv->napi);
 	xcan_chip_stop(ndev);
-	clk_disable_unprepare(priv->bus_clk);
-	clk_disable_unprepare(priv->can_clk);
 	free_irq(ndev->irq, ndev);
 	close_candev(ndev);
 
 	can_led_event(ndev, CAN_LED_EVENT_STOP);
+	pm_runtime_put(priv->dev);
 
 	return 0;
 }
@@ -935,27 +928,20 @@ static int xcan_get_berr_counter(const struct net_device *ndev,
 	struct xcan_priv *priv = netdev_priv(ndev);
 	int ret;
 
-	ret = clk_prepare_enable(priv->can_clk);
-	if (ret)
-		goto err;
-
-	ret = clk_prepare_enable(priv->bus_clk);
-	if (ret)
-		goto err_clk;
+	ret = pm_runtime_get_sync(priv->dev);
+	if (ret < 0) {
+		netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
+				__func__, ret);
+		return ret;
+	}
 
 	bec->txerr = priv->read_reg(priv, XCAN_ECR_OFFSET) & XCAN_ECR_TEC_MASK;
 	bec->rxerr = ((priv->read_reg(priv, XCAN_ECR_OFFSET) &
 			XCAN_ECR_REC_MASK) >> XCAN_ESR_REC_SHIFT);
 
-	clk_disable_unprepare(priv->bus_clk);
-	clk_disable_unprepare(priv->can_clk);
+	pm_runtime_put(priv->dev);
 
 	return 0;
-
-err_clk:
-	clk_disable_unprepare(priv->can_clk);
-err:
-	return ret;
 }
 
 
@@ -968,15 +954,45 @@ static const struct net_device_ops xcan_netdev_ops = {
 
 /**
  * xcan_suspend - Suspend method for the driver
- * @dev:	Address of the platform_device structure
+ * @dev:	Address of the device structure
  *
  * Put the driver into low power mode.
- * Return: 0 always
+ * Return: 0 on success and failure value on error
  */
 static int __maybe_unused xcan_suspend(struct device *dev)
 {
-	struct platform_device *pdev = dev_get_drvdata(dev);
-	struct net_device *ndev = platform_get_drvdata(pdev);
+	if (!device_may_wakeup(dev))
+		return pm_runtime_force_suspend(dev);
+
+	return 0;
+}
+
+/**
+ * xcan_resume - Resume from suspend
+ * @dev:	Address of the device structure
+ *
+ * Resume operation after suspend.
+ * Return: 0 on success and failure value on error
+ */
+static int __maybe_unused xcan_resume(struct device *dev)
+{
+	if (!device_may_wakeup(dev))
+		return pm_runtime_force_resume(dev);
+
+	return 0;
+
+}
+
+/**
+ * xcan_runtime_suspend - Runtime suspend method for the driver
+ * @dev:	Address of the device structure
+ *
+ * Put the driver into low power mode.
+ * Return: 0 always
+ */
+static int __maybe_unused xcan_runtime_suspend(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
 	struct xcan_priv *priv = netdev_priv(ndev);
 
 	if (netif_running(ndev)) {
@@ -987,43 +1003,55 @@ static int __maybe_unused xcan_suspend(struct device *dev)
 	priv->write_reg(priv, XCAN_MSR_OFFSET, XCAN_MSR_SLEEP_MASK);
 	priv->can.state = CAN_STATE_SLEEPING;
 
-	clk_disable(priv->bus_clk);
-	clk_disable(priv->can_clk);
+	clk_disable_unprepare(priv->bus_clk);
+	clk_disable_unprepare(priv->can_clk);
 
 	return 0;
 }
 
 /**
- * xcan_resume - Resume from suspend
- * @dev:	Address of the platformdevice structure
+ * xcan_runtime_resume - Runtime resume from suspend
+ * @dev:	Address of the device structure
  *
  * Resume operation after suspend.
  * Return: 0 on success and failure value on error
  */
-static int __maybe_unused xcan_resume(struct device *dev)
+static int __maybe_unused xcan_runtime_resume(struct device *dev)
 {
-	struct platform_device *pdev = dev_get_drvdata(dev);
-	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct net_device *ndev = dev_get_drvdata(dev);
 	struct xcan_priv *priv = netdev_priv(ndev);
 	int ret;
+	u32 isr, status;
 
-	ret = clk_enable(priv->bus_clk);
+	ret = clk_prepare_enable(priv->bus_clk);
 	if (ret) {
 		dev_err(dev, "Cannot enable clock.\n");
 		return ret;
 	}
-	ret = clk_enable(priv->can_clk);
+	ret = clk_prepare_enable(priv->can_clk);
 	if (ret) {
 		dev_err(dev, "Cannot enable clock.\n");
 		clk_disable_unprepare(priv->bus_clk);
 		return ret;
 	}
 
-	priv->write_reg(priv, XCAN_MSR_OFFSET, 0);
-	priv->write_reg(priv, XCAN_SRR_OFFSET, XCAN_SRR_CEN_MASK);
-	priv->can.state = CAN_STATE_ERROR_ACTIVE;
+	priv->write_reg(priv, XCAN_SRR_OFFSET, XCAN_SRR_RESET_MASK);
+	isr = priv->read_reg(priv, XCAN_ISR_OFFSET);
+	status = priv->read_reg(priv, XCAN_SR_OFFSET);
 
 	if (netif_running(ndev)) {
+		if (isr & XCAN_IXR_BSOFF_MASK) {
+			priv->can.state = CAN_STATE_BUS_OFF;
+			priv->write_reg(priv, XCAN_SRR_OFFSET,
+					XCAN_SRR_RESET_MASK);
+		} else if ((status & XCAN_SR_ESTAT_MASK) ==
+					XCAN_SR_ESTAT_MASK) {
+			priv->can.state = CAN_STATE_ERROR_PASSIVE;
+		} else if (status & XCAN_SR_ERRWRN_MASK) {
+			priv->can.state = CAN_STATE_ERROR_WARNING;
+		} else {
+			priv->can.state = CAN_STATE_ERROR_ACTIVE;
+		}
 		netif_device_attach(ndev);
 		netif_start_queue(ndev);
 	}
@@ -1031,7 +1059,10 @@ static int __maybe_unused xcan_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(xcan_dev_pm_ops, xcan_suspend, xcan_resume);
+static const struct dev_pm_ops xcan_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(xcan_suspend, xcan_resume)
+	SET_RUNTIME_PM_OPS(xcan_runtime_suspend, xcan_runtime_resume, NULL)
+};
 
 /**
  * xcan_probe - Platform registration call
@@ -1072,7 +1103,7 @@ static int xcan_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	priv = netdev_priv(ndev);
-	priv->dev = ndev;
+	priv->dev = &pdev->dev;
 	priv->can.bittiming_const = &xcan_bittiming_const;
 	priv->can.do_set_mode = xcan_do_set_mode;
 	priv->can.do_get_berr_counter = xcan_get_berr_counter;
@@ -1114,21 +1145,30 @@ static int xcan_probe(struct platform_device *pdev)
 		}
 	}
 
-	ret = clk_prepare_enable(priv->can_clk);
+	ret = clk_prepare(priv->can_clk);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to enable device clock\n");
 		goto err_free;
 	}
 
-	ret = clk_prepare_enable(priv->bus_clk);
+	ret = clk_prepare(priv->bus_clk);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to enable bus clock\n");
-		goto err_unprepare_disable_dev;
+		goto err_unprepare_dev;
 	}
 
 	priv->write_reg = xcan_write_reg_le;
 	priv->read_reg = xcan_read_reg_le;
 
+	pm_runtime_irq_safe(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	ret = pm_runtime_get_sync(&pdev->dev);
+	if (ret < 0) {
+		netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
+			__func__, ret);
+		goto err_unprepare_busclk;
+	}
+
 	if (priv->read_reg(priv, XCAN_SR_OFFSET) != XCAN_SR_CONFIG_MASK) {
 		priv->write_reg = xcan_write_reg_be;
 		priv->read_reg = xcan_read_reg_be;
@@ -1141,22 +1181,26 @@ static int xcan_probe(struct platform_device *pdev)
 	ret = register_candev(ndev);
 	if (ret) {
 		dev_err(&pdev->dev, "fail to register failed (err=%d)\n", ret);
-		goto err_unprepare_disable_busclk;
+		goto err_disableclks;
 	}
 
 	devm_can_led_init(ndev);
-	clk_disable_unprepare(priv->bus_clk);
-	clk_disable_unprepare(priv->can_clk);
+
+	pm_runtime_put(&pdev->dev);
+
 	netdev_dbg(ndev, "reg_base=0x%p irq=%d clock=%d, tx fifo depth:%d\n",
 			priv->reg_base, ndev->irq, priv->can.clock.freq,
 			priv->tx_max);
 
 	return 0;
 
-err_unprepare_disable_busclk:
-	clk_disable_unprepare(priv->bus_clk);
-err_unprepare_disable_dev:
-	clk_disable_unprepare(priv->can_clk);
+err_disableclks:
+	pm_runtime_put(priv->dev);
+err_unprepare_busclk:
+	pm_runtime_disable(&pdev->dev);
+	clk_unprepare(priv->bus_clk);
+err_unprepare_dev:
+	clk_unprepare(priv->can_clk);
 err_free:
 	free_candev(ndev);
 err:
@@ -1175,11 +1219,11 @@ static int xcan_remove(struct platform_device *pdev)
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct xcan_priv *priv = netdev_priv(ndev);
 
-	if (set_reset_mode(ndev) < 0)
-		netdev_err(ndev, "mode resetting failed!\n");
-
 	unregister_candev(ndev);
+	pm_runtime_disable(&pdev->dev);
 	netif_napi_del(&priv->napi);
+	clk_unprepare(priv->bus_clk);
+	clk_unprepare(priv->can_clk);
 	free_candev(ndev);
 
 	return 0;
-- 
2.1.2

[PATCH v6] can: xilinx: Convert to runtime_pm

[Sören Brinkmann]

Hi Kedar,

On Thu, 2015-10-22 at 10:15AM +0530, Kedareswara rao Appana wrote:
> Instead of enabling/disabling clocks at several locations in the driver,
> Use the runtime_pm framework. This consolidates the actions for runtime PM
> In the appropriate callbacks and makes the driver more readable and mantainable.
> 
> Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
[...]
>  /**
>   * xcan_probe - Platform registration call
> @@ -1072,7 +1103,7 @@ static int xcan_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	priv = netdev_priv(ndev);
> -	priv->dev = ndev;
> +	priv->dev = &pdev->dev;
>  	priv->can.bittiming_const = &xcan_bittiming_const;
>  	priv->can.do_set_mode = xcan_do_set_mode;
>  	priv->can.do_get_berr_counter = xcan_get_berr_counter;
> @@ -1114,21 +1145,30 @@ static int xcan_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -	ret = clk_prepare_enable(priv->can_clk);
> +	ret = clk_prepare(priv->can_clk);
>  	if (ret) {
>  		dev_err(&pdev->dev, "unable to enable device clock\n");
>  		goto err_free;
>  	}
>  
> -	ret = clk_prepare_enable(priv->bus_clk);
> +	ret = clk_prepare(priv->bus_clk);

Are these clk_prepare calls needed here? The runtime PM calls do
clk_prepare_enable and clk_disable_unprepare.

>  	if (ret) {
>  		dev_err(&pdev->dev, "unable to enable bus clock\n");
> -		goto err_unprepare_disable_dev;
> +		goto err_unprepare_dev;
>  	}
>  
>  	priv->write_reg = xcan_write_reg_le;
>  	priv->read_reg = xcan_read_reg_le;
>  
> +	pm_runtime_irq_safe(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);
> +	ret = pm_runtime_get_sync(&pdev->dev);
> +	if (ret < 0) {
> +		netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
> +			__func__, ret);
> +		goto err_unprepare_busclk;
> +	}
> +
>  	if (priv->read_reg(priv, XCAN_SR_OFFSET) != XCAN_SR_CONFIG_MASK) {
>  		priv->write_reg = xcan_write_reg_be;
>  		priv->read_reg = xcan_read_reg_be;
> @@ -1141,22 +1181,26 @@ static int xcan_probe(struct platform_device *pdev)
>  	ret = register_candev(ndev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "fail to register failed (err=%d)\n", ret);
> -		goto err_unprepare_disable_busclk;
> +		goto err_disableclks;
>  	}
>  
>  	devm_can_led_init(ndev);
> -	clk_disable_unprepare(priv->bus_clk);
> -	clk_disable_unprepare(priv->can_clk);
> +
> +	pm_runtime_put(&pdev->dev);
> +
>  	netdev_dbg(ndev, "reg_base=0x%p irq=%d clock=%d, tx fifo depth:%d\n",
>  			priv->reg_base, ndev->irq, priv->can.clock.freq,
>  			priv->tx_max);
>  
>  	return 0;
>  
> -err_unprepare_disable_busclk:
> -	clk_disable_unprepare(priv->bus_clk);
> -err_unprepare_disable_dev:
> -	clk_disable_unprepare(priv->can_clk);
> +err_disableclks:
> +	pm_runtime_put(priv->dev);
> +err_unprepare_busclk:
> +	pm_runtime_disable(&pdev->dev);
> +	clk_unprepare(priv->bus_clk);
> +err_unprepare_dev:
> +	clk_unprepare(priv->can_clk);
>  err_free:
>  	free_candev(ndev);
>  err:
> @@ -1175,11 +1219,11 @@ static int xcan_remove(struct platform_device *pdev)
>  	struct net_device *ndev = platform_get_drvdata(pdev);
>  	struct xcan_priv *priv = netdev_priv(ndev);
>  
> -	if (set_reset_mode(ndev) < 0)
> -		netdev_err(ndev, "mode resetting failed!\n");
> -
>  	unregister_candev(ndev);
> +	pm_runtime_disable(&pdev->dev);
>  	netif_napi_del(&priv->napi);
> +	clk_unprepare(priv->bus_clk);
> +	clk_unprepare(priv->can_clk);

I think this can go away when the prepare calls in probe go away.

	Thanks,
	S?ren

[PATCH v6] can: xilinx: Convert to runtime_pm

[Appana Durga Kedareswara Rao]

Hi Soren,

> -----Original Message-----
> From: S?ren Brinkmann [mailto:soren.brinkmann at xilinx.com]
> Sent: Friday, October 23, 2015 3:43 AM
> To: Appana Durga Kedareswara Rao
> Cc: Anirudha Sarangi; wg at grandegger.com; mkl at pengutronix.de; Michal
> Simek; linux-can at vger.kernel.org; netdev at vger.kernel.org; linux-arm-
> kernel at lists.infradead.org; linux-kernel at vger.kernel.org; Appana Durga
> Kedareswara Rao
> Subject: Re: [PATCH v6] can: xilinx: Convert to runtime_pm
> 
> Hi Kedar,
> 
> On Thu, 2015-10-22 at 10:15AM +0530, Kedareswara rao Appana wrote:
> > Instead of enabling/disabling clocks at several locations in the
> > driver, Use the runtime_pm framework. This consolidates the actions
> > for runtime PM In the appropriate callbacks and makes the driver more
> readable and mantainable.
> >
> > Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
> [...]
> >  /**
> >   * xcan_probe - Platform registration call @@ -1072,7 +1103,7 @@
> > static int xcan_probe(struct platform_device *pdev)
> >  		return -ENOMEM;
> >
> >  	priv = netdev_priv(ndev);
> > -	priv->dev = ndev;
> > +	priv->dev = &pdev->dev;
> >  	priv->can.bittiming_const = &xcan_bittiming_const;
> >  	priv->can.do_set_mode = xcan_do_set_mode;
> >  	priv->can.do_get_berr_counter = xcan_get_berr_counter; @@ -
> 1114,21
> > +1145,30 @@ static int xcan_probe(struct platform_device *pdev)
> >  		}
> >  	}
> >
> > -	ret = clk_prepare_enable(priv->can_clk);
> > +	ret = clk_prepare(priv->can_clk);
> >  	if (ret) {
> >  		dev_err(&pdev->dev, "unable to enable device clock\n");
> >  		goto err_free;
> >  	}
> >
> > -	ret = clk_prepare_enable(priv->bus_clk);
> > +	ret = clk_prepare(priv->bus_clk);
> 
> Are these clk_prepare calls needed here? The runtime PM calls do
> clk_prepare_enable and clk_disable_unprepare.

Ok Sure will remove.

> 
> >  	if (ret) {
> >  		dev_err(&pdev->dev, "unable to enable bus clock\n");
> > -		goto err_unprepare_disable_dev;
> > +		goto err_unprepare_dev;
> >  	}
> >
> >  	priv->write_reg = xcan_write_reg_le;
> >  	priv->read_reg = xcan_read_reg_le;
> >
> > +	pm_runtime_irq_safe(&pdev->dev);
> > +	pm_runtime_enable(&pdev->dev);
> > +	ret = pm_runtime_get_sync(&pdev->dev);
> > +	if (ret < 0) {
> > +		netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
> > +			__func__, ret);
> > +		goto err_unprepare_busclk;
> > +	}
> > +
> >  	if (priv->read_reg(priv, XCAN_SR_OFFSET) != XCAN_SR_CONFIG_MASK) {
> >  		priv->write_reg = xcan_write_reg_be;
> >  		priv->read_reg = xcan_read_reg_be;
> > @@ -1141,22 +1181,26 @@ static int xcan_probe(struct platform_device
> *pdev)
> >  	ret = register_candev(ndev);
> >  	if (ret) {
> >  		dev_err(&pdev->dev, "fail to register failed (err=%d)\n", ret);
> > -		goto err_unprepare_disable_busclk;
> > +		goto err_disableclks;
> >  	}
> >
> >  	devm_can_led_init(ndev);
> > -	clk_disable_unprepare(priv->bus_clk);
> > -	clk_disable_unprepare(priv->can_clk);
> > +
> > +	pm_runtime_put(&pdev->dev);
> > +
> >  	netdev_dbg(ndev, "reg_base=0x%p irq=%d clock=%d, tx fifo
> depth:%d\n",
> >  			priv->reg_base, ndev->irq, priv->can.clock.freq,
> >  			priv->tx_max);
> >
> >  	return 0;
> >
> > -err_unprepare_disable_busclk:
> > -	clk_disable_unprepare(priv->bus_clk);
> > -err_unprepare_disable_dev:
> > -	clk_disable_unprepare(priv->can_clk);
> > +err_disableclks:
> > +	pm_runtime_put(priv->dev);
> > +err_unprepare_busclk:
> > +	pm_runtime_disable(&pdev->dev);
> > +	clk_unprepare(priv->bus_clk);
> > +err_unprepare_dev:
> > +	clk_unprepare(priv->can_clk);
> >  err_free:
> >  	free_candev(ndev);
> >  err:
> > @@ -1175,11 +1219,11 @@ static int xcan_remove(struct platform_device
> *pdev)
> >  	struct net_device *ndev = platform_get_drvdata(pdev);
> >  	struct xcan_priv *priv = netdev_priv(ndev);
> >
> > -	if (set_reset_mode(ndev) < 0)
> > -		netdev_err(ndev, "mode resetting failed!\n");
> > -
> >  	unregister_candev(ndev);
> > +	pm_runtime_disable(&pdev->dev);
> >  	netif_napi_del(&priv->napi);
> > +	clk_unprepare(priv->bus_clk);
> > +	clk_unprepare(priv->can_clk);
> 
> I think this can go away when the prepare calls in probe go away.

Ok will fix and will send next version of the patch.

Regards,
Kedar.

> 
> 	Thanks,
> 	S?ren