Merge tag 'linux-can-next-for-6.6-20230719' of...

Merge tag 'linux-can-next-for-6.6-20230719' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
pull-request: can-next 2023-07-19

The first 2 patches are by Judith Mendez, target the m_can driver and
add hrtimer based polling support for TI AM62x SoCs, where the
interrupt of the MCU domain's m_can cores is not routed to the Cortex
A53 core.

A patch by Rob Herring converts the grcan driver to use the correct DT
include files.

Michal Simek and Srinivas Neeli add support for optional reset control
to the xilinx_can driver.

The next 2 patches are by Jimmy Assarsson and add support for new
Kvaser pciefd to the kvaser_pciefd driver.

Mao Zhu's patch for the ucan driver removes a repeated word from a
comment.

* tag 'linux-can-next-for-6.6-20230719' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next:
  can: ucan: Remove repeated word
  can: kvaser_pciefd: Add support for new Kvaser pciefd devices
  can: kvaser_pciefd: Move hardware specific constants and functions into a driver_data struct
  can: Explicitly include correct DT includes
  can: xilinx_can: Add support for controller reset
  dt-bindings: can: xilinx_can: Add reset description
  can: m_can: Add hrtimer to generate software interrupt
  dt-bindings: net: can: Remove interrupt properties for MCAN
====================

Link: https://lore.kernel.org/r/20230719072348.525039-1-mkl@pengutronix.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/devicetree/bindings/net/can/bosch,m_can.yaml

@@ -122,8 +122,6 @@ required:
   - compatible
   - reg
   - reg-names
-  - interrupts
-  - interrupt-names
   - clocks
   - clock-names
   - bosch,mram-cfg
@@ -132,6 +130,7 @@ additionalProperties: false
 
 examples:
   - |
+    // Example with interrupts
     #include <dt-bindings/clock/imx6sx-clock.h>
     can@20e8000 {
       compatible = "bosch,m_can";
@@ -149,4 +148,21 @@ examples:
       };
     };
 
+  - |
+    // Example with timer polling
+    #include <dt-bindings/clock/imx6sx-clock.h>
+    can@20e8000 {
+      compatible = "bosch,m_can";
+      reg = <0x020e8000 0x4000>, <0x02298000 0x4000>;
+      reg-names = "m_can", "message_ram";
+      clocks = <&clks IMX6SX_CLK_CANFD>,
+               <&clks IMX6SX_CLK_CANFD>;
+      clock-names = "hclk", "cclk";
+      bosch,mram-cfg = <0x0 0 0 32 0 0 0 1>;
+
+      can-transceiver {
+        max-bitrate = <5000000>;
+      };
+    };
+
 ...

Documentation/devicetree/bindings/net/can/xilinx,can.yaml

@@ -46,6 +46,9 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: CAN Tx mailbox buffer count (CAN FD)
 
+  resets:
+    maxItems: 1
+
 required:
   - compatible
   - reg

drivers/net/can/Kconfig

@@ -160,8 +160,13 @@ config CAN_KVASER_PCIEFD
 	    Kvaser PCIEcan 4xHS
 	    Kvaser PCIEcan 2xHS v2
 	    Kvaser PCIEcan HS v2
+	    Kvaser PCIEcan 1xCAN v3
+	    Kvaser PCIEcan 2xCAN v3
+	    Kvaser PCIEcan 4xCAN v2
 	    Kvaser Mini PCI Express HS v2
 	    Kvaser Mini PCI Express 2xHS v2
+	    Kvaser Mini PCI Express 1xCAN v3
+	    Kvaser Mini PCI Express 2xCAN v3
 
 config CAN_SLCAN
 	tristate "Serial / USB serial CAN Adaptors (slcan)"

drivers/net/can/grcan.c

@@ -30,8 +30,9 @@
 #include <linux/ethtool.h>
 #include <linux/io.h>
 #include <linux/can/dev.h>
+#include <linux/platform_device.h>
 #include <linux/spinlock.h>
-#include <linux/of_platform.h>
+#include <linux/of.h>
 #include <linux/of_irq.h>
 
 #include <linux/dma-mapping.h>

drivers/net/can/m_can/m_can.c

@@ -11,6 +11,7 @@
 #include <linux/bitfield.h>
 #include <linux/can/dev.h>
 #include <linux/ethtool.h>
+#include <linux/hrtimer.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
@@ -308,6 +309,9 @@ enum m_can_reg {
 #define TX_EVENT_MM_MASK	GENMASK(31, 24)
 #define TX_EVENT_TXTS_MASK	GENMASK(15, 0)
 
+/* Hrtimer polling interval */
+#define HRTIMER_POLL_INTERVAL_MS		1
+
 /* The ID and DLC registers are adjacent in M_CAN FIFO memory,
  * and we can save a (potentially slow) bus round trip by combining
  * reads and writes to them.
@@ -1414,6 +1418,12 @@ static int m_can_start(struct net_device *dev)
 
 	m_can_enable_all_interrupts(cdev);
 
+	if (!dev->irq) {
+		dev_dbg(cdev->dev, "Start hrtimer\n");
+		hrtimer_start(&cdev->hrtimer, ms_to_ktime(HRTIMER_POLL_INTERVAL_MS),
+			      HRTIMER_MODE_REL_PINNED);
+	}
+
 	return 0;
 }
 
@@ -1568,6 +1578,11 @@ static void m_can_stop(struct net_device *dev)
 {
 	struct m_can_classdev *cdev = netdev_priv(dev);
 
+	if (!dev->irq) {
+		dev_dbg(cdev->dev, "Stop hrtimer\n");
+		hrtimer_cancel(&cdev->hrtimer);
+	}
+
 	/* disable all interrupts */
 	m_can_disable_all_interrupts(cdev);
 
@@ -1793,6 +1808,18 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
 	return NETDEV_TX_OK;
 }
 
+static enum hrtimer_restart hrtimer_callback(struct hrtimer *timer)
+{
+	struct m_can_classdev *cdev = container_of(timer, struct
+						   m_can_classdev, hrtimer);
+
+	m_can_isr(0, cdev->net);
+
+	hrtimer_forward_now(timer, ms_to_ktime(HRTIMER_POLL_INTERVAL_MS));
+
+	return HRTIMER_RESTART;
+}
+
 static int m_can_open(struct net_device *dev)
 {
 	struct m_can_classdev *cdev = netdev_priv(dev);
@@ -1831,7 +1858,7 @@ static int m_can_open(struct net_device *dev)
 		err = request_threaded_irq(dev->irq, NULL, m_can_isr,
 					   IRQF_ONESHOT,
 					   dev->name, dev);
-	} else {
+	} else if (dev->irq) {
 		err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
 				  dev);
 	}
@@ -2027,6 +2054,9 @@ int m_can_class_register(struct m_can_classdev *cdev)
 			goto clk_disable;
 	}
 
+	if (!cdev->net->irq)
+		cdev->hrtimer.function = &hrtimer_callback;
+
 	ret = m_can_dev_setup(cdev);
 	if (ret)
 		goto rx_offload_del;

drivers/net/can/m_can/m_can.h

@@ -15,6 +15,7 @@
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/freezer.h>
+#include <linux/hrtimer.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
@@ -93,6 +94,8 @@ struct m_can_classdev {
 	int is_peripheral;
 
 	struct mram_cfg mcfg[MRAM_CFG_NUM];
+
+	struct hrtimer hrtimer;
 };
 
 struct m_can_classdev *m_can_class_allocate_dev(struct device *dev, int sizeof_priv);

drivers/net/can/m_can/m_can_platform.c

@@ -5,6 +5,7 @@
 //
 // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
 
+#include <linux/hrtimer.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 
@@ -82,7 +83,7 @@ static int m_can_plat_probe(struct platform_device *pdev)
 	void __iomem *addr;
 	void __iomem *mram_addr;
 	struct phy *transceiver;
-	int irq, ret = 0;
+	int irq = 0, ret = 0;
 
 	mcan_class = m_can_class_allocate_dev(&pdev->dev,
 					      sizeof(struct m_can_plat_priv));
@@ -96,12 +97,24 @@ static int m_can_plat_probe(struct platform_device *pdev)
 		goto probe_fail;
 
 	addr = devm_platform_ioremap_resource_byname(pdev, "m_can");
-	irq = platform_get_irq_byname(pdev, "int0");
-	if (IS_ERR(addr) || irq < 0) {
-		ret = -EINVAL;
+	if (IS_ERR(addr)) {
+		ret = PTR_ERR(addr);
 		goto probe_fail;
 	}
 
+	if (device_property_present(mcan_class->dev, "interrupts") ||
+	    device_property_present(mcan_class->dev, "interrupt-names")) {
+		irq = platform_get_irq_byname(pdev, "int0");
+		if (irq < 0) {
+			ret = irq;
+			goto probe_fail;
+		}
+	} else {
+		dev_dbg(mcan_class->dev, "Polling enabled, initialize hrtimer");
+		hrtimer_init(&mcan_class->hrtimer, CLOCK_MONOTONIC,
+			     HRTIMER_MODE_REL_PINNED);
+	}
+
 	/* message ram could be shared */
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
 	if (!res) {

drivers/net/can/usb/ucan.c

@@ -284,7 +284,7 @@ struct ucan_priv {
 	 */
 	spinlock_t echo_skb_lock;
 
-	/* usb device information information */
+	/* usb device information */
 	u8 intf_index;
 	u8 in_ep_addr;
 	u8 out_ep_addr;

drivers/net/can/xilinx_can.c

@@ -30,6 +30,7 @@
 #include <linux/can/error.h>
 #include <linux/phy/phy.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 
 #define DRIVER_NAME	"xilinx_can"
 
@@ -200,6 +201,7 @@ struct xcan_devtype_data {
  * @can_clk:			Pointer to struct clk
  * @devtype:			Device type specific constants
  * @transceiver:		Optional pointer to associated CAN transceiver
+ * @rstc:			Pointer to reset control
  */
 struct xcan_priv {
 	struct can_priv can;
@@ -218,6 +220,7 @@ struct xcan_priv {
 	struct clk *can_clk;
 	struct xcan_devtype_data devtype;
 	struct phy *transceiver;
+	struct reset_control *rstc;
 };
 
 /* CAN Bittiming constants as per Xilinx CAN specs */
@@ -1799,6 +1802,16 @@ static int xcan_probe(struct platform_device *pdev)
 	priv->can.do_get_berr_counter = xcan_get_berr_counter;
 	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
 					CAN_CTRLMODE_BERR_REPORTING;
+	priv->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+	if (IS_ERR(priv->rstc)) {
+		dev_err(&pdev->dev, "Cannot get CAN reset.\n");
+		ret = PTR_ERR(priv->rstc);
+		goto err_free;
+	}
+
+	ret = reset_control_reset(priv->rstc);
+	if (ret)
+		goto err_free;
 
 	if (devtype->cantype == XAXI_CANFD) {
 		priv->can.data_bittiming_const =
@@ -1827,7 +1840,7 @@ static int xcan_probe(struct platform_device *pdev)
 	/* Get IRQ for the device */
 	ret = platform_get_irq(pdev, 0);
 	if (ret < 0)
-		goto err_free;
+		goto err_reset;
 
 	ndev->irq = ret;
 
@@ -1843,21 +1856,21 @@ static int xcan_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->can_clk)) {
 		ret = dev_err_probe(&pdev->dev, PTR_ERR(priv->can_clk),
 				    "device clock not found\n");
-		goto err_free;
+		goto err_reset;
 	}
 
 	priv->bus_clk = devm_clk_get(&pdev->dev, devtype->bus_clk_name);
 	if (IS_ERR(priv->bus_clk)) {
 		ret = dev_err_probe(&pdev->dev, PTR_ERR(priv->bus_clk),
 				    "bus clock not found\n");
-		goto err_free;
+		goto err_reset;
 	}
 
 	transceiver = devm_phy_optional_get(&pdev->dev, NULL);
 	if (IS_ERR(transceiver)) {
 		ret = PTR_ERR(transceiver);
 		dev_err_probe(&pdev->dev, ret, "failed to get phy\n");
-		goto err_free;
+		goto err_reset;
 	}
 	priv->transceiver = transceiver;
 
@@ -1904,6 +1917,8 @@ static int xcan_probe(struct platform_device *pdev)
 err_disableclks:
 	pm_runtime_put(priv->dev);
 	pm_runtime_disable(&pdev->dev);
+err_reset:
+	reset_control_assert(priv->rstc);
 err_free:
 	free_candev(ndev);
 err:
@@ -1920,9 +1935,11 @@ static int xcan_probe(struct platform_device *pdev)
 static void xcan_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct xcan_priv *priv = netdev_priv(ndev);
 
 	unregister_candev(ndev);
 	pm_runtime_disable(&pdev->dev);
+	reset_control_assert(priv->rstc);
 	free_candev(ndev);
 }