Merge tag 'linux-can-next-for-5.17-20211208' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
can-next 2021-12-08

The first patch is by Vincent Mailhol and replaces the custom CAN
units with generic one form linux/units.h.

The next 3 patches are by Evgeny Boger and add Allwinner R40 support
to the sun4i CAN driver.

Andy Shevchenko contributes 4 patches to the hi311x CAN driver,
consisting of cleanups and converting the driver to the device
property API.

* tag 'linux-can-next-for-5.17-20211208' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next:
  can: hi311x: hi3110_can_probe(): convert to use dev_err_probe()
  can: hi311x: hi3110_can_probe(): make use of device property API
  can: hi311x: hi3110_can_probe(): try to get crystal clock rate from property
  can: hi311x: hi3110_can_probe(): use devm_clk_get_optional() to get the input clock
  ARM: dts: sun8i: r40: add node for CAN controller
  can: sun4i_can: add support for R40 CAN controller
  dt-bindings: net: can: add support for Allwinner R40 CAN controller
  can: bittiming: replace CAN units with the generic ones from linux/units.h
====================

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: kuba-moo

Documentation/devicetree/bindings/net/can/allwinner,sun4i-a10-can.yaml

@@ -17,6 +17,7 @@ properties:
           - const: allwinner,sun7i-a20-can
           - const: allwinner,sun4i-a10-can
       - const: allwinner,sun4i-a10-can
+      - const: allwinner,sun8i-r40-can
 
   reg:
     maxItems: 1
@@ -27,6 +28,19 @@ properties:
   clocks:
     maxItems: 1
 
+  resets:
+    maxItems: 1
+
+if:
+  properties:
+    compatible:
+      contains:
+        const: allwinner,sun8i-r40-can
+
+then:
+  required:
+    - resets
+
 required:
   - compatible
   - reg
@@ -47,5 +61,15 @@ examples:
         interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
         clocks = <&ccu CLK_APB1_CAN>;
     };
+  - |
+    #define RST_BUS_CAN		68
+    #define CLK_BUS_CAN		91
+    can1: can@1c2bc00 {
+        compatible = "allwinner,sun8i-r40-can";
+        reg = <0x01c2bc00 0x400>;
+        interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&ccu CLK_BUS_CAN>;
+        resets = <&ccu RST_BUS_CAN>;
+    };
 
 ...

arch/arm/boot/dts/sun8i-r40.dtsi

@@ -511,6 +511,16 @@
 			#interrupt-cells = <3>;
 			#gpio-cells = <3>;
 
+			can_ph_pins: can-ph-pins {
+				pins = "PH20", "PH21";
+				function = "can";
+			};
+
+			can_pa_pins: can-pa-pins {
+				pins = "PA16", "PA17";
+				function = "can";
+			};
+
 			clk_out_a_pin: clk-out-a-pin {
 				pins = "PI12";
 				function = "clk_out_a";
@@ -926,6 +936,15 @@
 			#size-cells = <0>;
 		};
 
+		can0: can@1c2bc00 {
+			compatible = "allwinner,sun8i-r40-can";
+			reg = <0x01c2bc00 0x400>;
+			interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&ccu CLK_BUS_CAN>;
+			resets = <&ccu RST_BUS_CAN>;
+			status = "disabled";
+		};
+
 		i2c4: i2c@1c2c000 {
 			compatible = "allwinner,sun6i-a31-i2c";
 			reg = <0x01c2c000 0x400>;

drivers/net/can/dev/bittiming.c

@@ -4,6 +4,7 @@
  * Copyright (C) 2008-2009 Wolfgang Grandegger <[email protected]>
  */
 
+#include <linux/units.h>
 #include <linux/can/dev.h>
 
 #ifdef CONFIG_CAN_CALC_BITTIMING
@@ -81,9 +82,9 @@ int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt,
 	if (bt->sample_point) {
 		sample_point_nominal = bt->sample_point;
 	} else {
-		if (bt->bitrate > 800 * CAN_KBPS)
+		if (bt->bitrate > 800 * KILO /* BPS */)
 			sample_point_nominal = 750;
-		else if (bt->bitrate > 500 * CAN_KBPS)
+		else if (bt->bitrate > 500 * KILO /* BPS */)
 			sample_point_nominal = 800;
 		else
 			sample_point_nominal = 875;

drivers/net/can/spi/hi311x.c

@@ -25,11 +25,11 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/spi/spi.h>
@@ -828,19 +828,25 @@ MODULE_DEVICE_TABLE(spi, hi3110_id_table);
 
 static int hi3110_can_probe(struct spi_device *spi)
 {
-	const struct of_device_id *of_id = of_match_device(hi3110_of_match,
-							   &spi->dev);
+	struct device *dev = &spi->dev;
 	struct net_device *net;
 	struct hi3110_priv *priv;
+	const void *match;
 	struct clk *clk;
-	int freq, ret;
+	u32 freq;
+	int ret;
+
+	clk = devm_clk_get_optional(&spi->dev, NULL);
+	if (IS_ERR(clk))
+		return dev_err_probe(dev, PTR_ERR(clk), "no CAN clock source defined\n");
 
-	clk = devm_clk_get(&spi->dev, NULL);
-	if (IS_ERR(clk)) {
-		dev_err(&spi->dev, "no CAN clock source defined\n");
-		return PTR_ERR(clk);
+	if (clk) {
+		freq = clk_get_rate(clk);
+	} else {
+		ret = device_property_read_u32(dev, "clock-frequency", &freq);
+		if (ret)
+			return dev_err_probe(dev, ret, "Failed to get clock-frequency!\n");
 	}
-	freq = clk_get_rate(clk);
 
 	/* Sanity check */
 	if (freq > 40000000)
@@ -851,11 +857,9 @@ static int hi3110_can_probe(struct spi_device *spi)
 	if (!net)
 		return -ENOMEM;
 
-	if (!IS_ERR(clk)) {
-		ret = clk_prepare_enable(clk);
-		if (ret)
-			goto out_free;
-	}
+	ret = clk_prepare_enable(clk);
+	if (ret)
+		goto out_free;
 
 	net->netdev_ops = &hi3110_netdev_ops;
 	net->flags |= IFF_ECHO;
@@ -870,8 +874,9 @@ static int hi3110_can_probe(struct spi_device *spi)
 		CAN_CTRLMODE_LISTENONLY |
 		CAN_CTRLMODE_BERR_REPORTING;
 
-	if (of_id)
-		priv->model = (enum hi3110_model)(uintptr_t)of_id->data;
+	match = device_get_match_data(dev);
+	if (match)
+		priv->model = (enum hi3110_model)(uintptr_t)match;
 	else
 		priv->model = spi_get_device_id(spi)->driver_data;
 	priv->net = net;
@@ -918,9 +923,7 @@ static int hi3110_can_probe(struct spi_device *spi)
 
 	ret = hi3110_hw_probe(spi);
 	if (ret) {
-		if (ret == -ENODEV)
-			dev_err(&spi->dev, "Cannot initialize %x. Wrong wiring?\n",
-				priv->model);
+		dev_err_probe(dev, ret, "Cannot initialize %x. Wrong wiring?\n", priv->model);
 		goto error_probe;
 	}
 	hi3110_hw_sleep(spi);
@@ -938,14 +941,12 @@ static int hi3110_can_probe(struct spi_device *spi)
 	hi3110_power_enable(priv->power, 0);
 
  out_clk:
-	if (!IS_ERR(clk))
-		clk_disable_unprepare(clk);
+	clk_disable_unprepare(clk);
 
  out_free:
 	free_candev(net);
 
-	dev_err(&spi->dev, "Probe failed, err=%d\n", -ret);
-	return ret;
+	return dev_err_probe(dev, ret, "Probe failed\n");
 }
 
 static int hi3110_can_remove(struct spi_device *spi)
@@ -957,8 +958,7 @@ static int hi3110_can_remove(struct spi_device *spi)
 
 	hi3110_power_enable(priv->power, 0);
 
-	if (!IS_ERR(priv->clk))
-		clk_disable_unprepare(priv->clk);
+	clk_disable_unprepare(priv->clk);
 
 	free_candev(net);
 

drivers/net/can/sun4i_can.c

@@ -61,6 +61,7 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/reset.h>
 
 #define DRV_NAME "sun4i_can"
 
@@ -200,10 +201,20 @@
 #define SUN4I_CAN_MAX_IRQ	20
 #define SUN4I_MODE_MAX_RETRIES	100
 
+/**
+ * struct sun4ican_quirks - Differences between SoC variants.
+ *
+ * @has_reset: SoC needs reset deasserted.
+ */
+struct sun4ican_quirks {
+	bool has_reset;
+};
+
 struct sun4ican_priv {
 	struct can_priv can;
 	void __iomem *base;
 	struct clk *clk;
+	struct reset_control *reset;
 	spinlock_t cmdreg_lock;	/* lock for concurrent cmd register writes */
 };
 
@@ -702,6 +713,13 @@ static int sun4ican_open(struct net_device *dev)
 		goto exit_irq;
 	}
 
+	/* software reset deassert */
+	err = reset_control_deassert(priv->reset);
+	if (err) {
+		netdev_err(dev, "could not deassert CAN reset\n");
+		goto exit_soft_reset;
+	}
+
 	/* turn on clocking for CAN peripheral block */
 	err = clk_prepare_enable(priv->clk);
 	if (err) {
@@ -723,6 +741,8 @@ static int sun4ican_open(struct net_device *dev)
 exit_can_start:
 	clk_disable_unprepare(priv->clk);
 exit_clock:
+	reset_control_assert(priv->reset);
+exit_soft_reset:
 	free_irq(dev->irq, dev);
 exit_irq:
 	close_candev(dev);
@@ -736,6 +756,7 @@ static int sun4ican_close(struct net_device *dev)
 	netif_stop_queue(dev);
 	sun4i_can_stop(dev);
 	clk_disable_unprepare(priv->clk);
+	reset_control_assert(priv->reset);
 
 	free_irq(dev->irq, dev);
 	close_candev(dev);
@@ -750,9 +771,27 @@ static const struct net_device_ops sun4ican_netdev_ops = {
 	.ndo_start_xmit = sun4ican_start_xmit,
 };
 
+static const struct sun4ican_quirks sun4ican_quirks_a10 = {
+	.has_reset = false,
+};
+
+static const struct sun4ican_quirks sun4ican_quirks_r40 = {
+	.has_reset = true,
+};
+
 static const struct of_device_id sun4ican_of_match[] = {
-	{.compatible = "allwinner,sun4i-a10-can"},
-	{},
+	{
+		.compatible = "allwinner,sun4i-a10-can",
+		.data = &sun4ican_quirks_a10
+	}, {
+		.compatible = "allwinner,sun7i-a20-can",
+		.data = &sun4ican_quirks_a10
+	}, {
+		.compatible = "allwinner,sun8i-r40-can",
+		.data = &sun4ican_quirks_r40
+	}, {
+		/* sentinel */
+	},
 };
 
 MODULE_DEVICE_TABLE(of, sun4ican_of_match);
@@ -771,10 +810,28 @@ static int sun4ican_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct clk *clk;
+	struct reset_control *reset = NULL;
 	void __iomem *addr;
 	int err, irq;
 	struct net_device *dev;
 	struct sun4ican_priv *priv;
+	const struct sun4ican_quirks *quirks;
+
+	quirks = of_device_get_match_data(&pdev->dev);
+	if (!quirks) {
+		dev_err(&pdev->dev, "failed to determine the quirks to use\n");
+		err = -ENODEV;
+		goto exit;
+	}
+
+	if (quirks->has_reset) {
+		reset = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+		if (IS_ERR(reset)) {
+			dev_err(&pdev->dev, "unable to request reset\n");
+			err = PTR_ERR(reset);
+			goto exit;
+		}
+	}
 
 	clk = of_clk_get(np, 0);
 	if (IS_ERR(clk)) {
@@ -818,6 +875,7 @@ static int sun4ican_probe(struct platform_device *pdev)
 				       CAN_CTRLMODE_3_SAMPLES;
 	priv->base = addr;
 	priv->clk = clk;
+	priv->reset = reset;
 	spin_lock_init(&priv->cmdreg_lock);
 
 	platform_set_drvdata(pdev, dev);

drivers/net/can/usb/etas_es58x/es581_4.c

@@ -10,6 +10,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/units.h>
 #include <asm/unaligned.h>
 
 #include "es58x_core.h"
@@ -469,8 +470,8 @@ const struct es58x_parameters es581_4_param = {
 	.bittiming_const = &es581_4_bittiming_const,
 	.data_bittiming_const = NULL,
 	.tdc_const = NULL,
-	.bitrate_max = 1 * CAN_MBPS,
-	.clock = {.freq = 50 * CAN_MHZ},
+	.bitrate_max = 1 * MEGA /* BPS */,
+	.clock = {.freq = 50 * MEGA /* Hz */},
 	.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC,
 	.tx_start_of_frame = 0xAFAF,
 	.rx_start_of_frame = 0xFAFA,

drivers/net/can/usb/etas_es58x/es58x_fd.c

@@ -12,6 +12,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/units.h>
 #include <asm/unaligned.h>
 
 #include "es58x_core.h"
@@ -522,8 +523,8 @@ const struct es58x_parameters es58x_fd_param = {
 	 * Mbps work in an optimal environment but are not recommended
 	 * for production environment.
 	 */
-	.bitrate_max = 8 * CAN_MBPS,
-	.clock = {.freq = 80 * CAN_MHZ},
+	.bitrate_max = 8 * MEGA /* BPS */,
+	.clock = {.freq = 80 * MEGA /* Hz */},
 	.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY |
 	    CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_FD | CAN_CTRLMODE_FD_NON_ISO |
 	    CAN_CTRLMODE_CC_LEN8_DLC | CAN_CTRLMODE_TDC_AUTO,

include/linux/can/bittiming.h

@@ -12,13 +12,6 @@
 #define CAN_SYNC_SEG 1
 
 
-/* Kilobits and Megabits per second */
-#define CAN_KBPS 1000UL
-#define CAN_MBPS 1000000UL
-
-/* Megahertz */
-#define CAN_MHZ 1000000UL
-
 #define CAN_CTRLMODE_TDC_MASK					\
 	(CAN_CTRLMODE_TDC_AUTO | CAN_CTRLMODE_TDC_MANUAL)