[PATCH v3 0/6] can: tcan4x5x: Introduce tcan4552/4553

[PATCH v3 0/6] can: tcan4x5x: Introduce tcan4552/4553

[Markus Schneider-Pargmann]

Hi everyone,

This series introduces two new chips tcan-4552 and tcan-4553. The
generic driver works in general but needs a few small changes. These are
caused by the removal of wake and state pins.

v3 removes the check of the devicetree compatible and completely relies
on the ID2 register.

Based on v6.5-rc1.

Best,
Markus

Changes in v3:
- Rebased to v6.5-rc1
- Removed devicetree compatible check in tcan driver. The device version
  is now unconditionally detected using the ID2 register

Changes in v2:
- Update the binding documentation to specify tcan4552 and tcan4553 with
  the tcan4x5x as fallback
- Update the driver to use auto detection as well. If compatible differs
  from the ID2 register, use the ID2 register and print a warning.
- Small style changes

Previous versions:
v2 - https://lore.kernel.org/lkml/20230621093103.3134655-1-msp@baylibre.com/
v1 - https://lore.kernel.org/lkml/20230314151201.2317134-1-msp@baylibre.com

Markus Schneider-Pargmann (6):
  dt-bindings: can: tcan4x5x: Add tcan4552 and tcan4553 variants
  can: tcan4x5x: Remove reserved register 0x814 from writable table
  can: tcan4x5x: Check size of mram configuration
  can: tcan4x5x: Rename ID registers to match datasheet
  can: tcan4x5x: Add support for tcan4552/4553
  can: tcan4x5x: Add error messages in probe

 .../devicetree/bindings/net/can/tcan4x5x.txt  |  11 +-
 drivers/net/can/m_can/m_can.c                 |  16 ++
 drivers/net/can/m_can/m_can.h                 |   1 +
 drivers/net/can/m_can/tcan4x5x-core.c         | 139 +++++++++++++++---
 drivers/net/can/m_can/tcan4x5x-regmap.c       |   1 -
 5 files changed, 142 insertions(+), 26 deletions(-)


base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
-- 
2.40.1

[PATCH v3 1/6] dt-bindings: can: tcan4x5x: Add tcan4552 and tcan4553 variants

[Markus Schneider-Pargmann]

These two new chips do not have state or wake pins.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 .../devicetree/bindings/net/can/tcan4x5x.txt          | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/can/tcan4x5x.txt b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt
index e3501bfa22e9..170e23f0610d 100644
--- a/Documentation/devicetree/bindings/net/can/tcan4x5x.txt
+++ b/Documentation/devicetree/bindings/net/can/tcan4x5x.txt
@@ -4,7 +4,10 @@ Texas Instruments TCAN4x5x CAN Controller
 This file provides device node information for the TCAN4x5x interface contains.
 
 Required properties:
-	- compatible: "ti,tcan4x5x"
+	- compatible:
+		"ti,tcan4552", "ti,tcan4x5x"
+		"ti,tcan4553", "ti,tcan4x5x" or
+		"ti,tcan4x5x"
 	- reg: 0
 	- #address-cells: 1
 	- #size-cells: 0
@@ -21,8 +24,10 @@ Optional properties:
 	- reset-gpios: Hardwired output GPIO. If not defined then software
 		       reset.
 	- device-state-gpios: Input GPIO that indicates if the device is in
-			      a sleep state or if the device is active.
-	- device-wake-gpios: Wake up GPIO to wake up the TCAN device.
+			      a sleep state or if the device is active. Not
+			      available with tcan4552/4553.
+	- device-wake-gpios: Wake up GPIO to wake up the TCAN device. Not
+			     available with tcan4552/4553.
 
 Example:
 tcan4x5x: tcan4x5x@0 {
-- 
2.40.1

[PATCH v3 2/6] can: tcan4x5x: Remove reserved register 0x814 from writable table

[Markus Schneider-Pargmann]

The mentioned register is not writable. It is reserved and should not be
written.

Fixes: 39dbb21b6a29 ("can: tcan4x5x: Specify separate read/write ranges")
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
---
 drivers/net/can/m_can/tcan4x5x-regmap.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/can/m_can/tcan4x5x-regmap.c b/drivers/net/can/m_can/tcan4x5x-regmap.c
index 2b218ce04e9f..fafa6daa67e6 100644
--- a/drivers/net/can/m_can/tcan4x5x-regmap.c
+++ b/drivers/net/can/m_can/tcan4x5x-regmap.c
@@ -95,7 +95,6 @@ static const struct regmap_range tcan4x5x_reg_table_wr_range[] = {
 	regmap_reg_range(0x000c, 0x0010),
 	/* Device configuration registers and Interrupt Flags*/
 	regmap_reg_range(0x0800, 0x080c),
-	regmap_reg_range(0x0814, 0x0814),
 	regmap_reg_range(0x0820, 0x0820),
 	regmap_reg_range(0x0830, 0x0830),
 	/* M_CAN */
-- 
2.40.1

[PATCH v3 3/6] can: tcan4x5x: Check size of mram configuration

[Markus Schneider-Pargmann]

To reduce debugging effort in case the mram is misconfigured, add this
size check of the DT configuration. Currently if the mram configuration
doesn't fit into the available MRAM it just overwrites other areas of
the MRAM.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
---
 drivers/net/can/m_can/m_can.c         | 16 ++++++++++++++++
 drivers/net/can/m_can/m_can.h         |  1 +
 drivers/net/can/m_can/tcan4x5x-core.c |  5 +++++
 3 files changed, 22 insertions(+)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index c5af92bcc9c9..9210cf0705a1 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1887,6 +1887,22 @@ static int register_m_can_dev(struct net_device *dev)
 	return register_candev(dev);
 }
 
+int m_can_check_mram_cfg(struct m_can_classdev *cdev, u32 mram_max_size)
+{
+	u32 total_size;
+
+	total_size = cdev->mcfg[MRAM_TXB].off - cdev->mcfg[MRAM_SIDF].off +
+			cdev->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
+	if (total_size > mram_max_size) {
+		dev_err(cdev->dev, "Total size of mram config(%u) exceeds mram(%u)\n",
+			total_size, mram_max_size);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(m_can_check_mram_cfg);
+
 static void m_can_of_parse_mram(struct m_can_classdev *cdev,
 				const u32 *mram_config_vals)
 {
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index a839dc71dc9b..d8150d8128e7 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@@ -101,6 +101,7 @@ int m_can_class_register(struct m_can_classdev *cdev);
 void m_can_class_unregister(struct m_can_classdev *cdev);
 int m_can_class_get_clocks(struct m_can_classdev *cdev);
 int m_can_init_ram(struct m_can_classdev *priv);
+int m_can_check_mram_cfg(struct m_can_classdev *cdev, u32 mram_max_size);
 
 int m_can_class_suspend(struct device *dev);
 int m_can_class_resume(struct device *dev);
diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 2342aa011647..e706518176e4 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -80,6 +80,7 @@
 	 TCAN4X5X_MCAN_IR_RF1F)
 
 #define TCAN4X5X_MRAM_START 0x8000
+#define TCAN4X5X_MRAM_SIZE 0x800
 #define TCAN4X5X_MCAN_OFFSET 0x1000
 
 #define TCAN4X5X_CLEAR_ALL_INT 0xffffffff
@@ -307,6 +308,10 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	if (!mcan_class)
 		return -ENOMEM;
 
+	ret = m_can_check_mram_cfg(mcan_class, TCAN4X5X_MRAM_SIZE);
+	if (ret)
+		goto out_m_can_class_free_dev;
+
 	priv = cdev_to_priv(mcan_class);
 
 	priv->power = devm_regulator_get_optional(&spi->dev, "vsup");
-- 
2.40.1

[PATCH v3 4/6] can: tcan4x5x: Rename ID registers to match datasheet

[Markus Schneider-Pargmann]

The datasheet calls these registers ID1 and ID2. Rename these to avoid
confusion.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
---
 drivers/net/can/m_can/tcan4x5x-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index e706518176e4..fb9375fa20ec 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -6,8 +6,8 @@
 
 #define TCAN4X5X_EXT_CLK_DEF 40000000
 
-#define TCAN4X5X_DEV_ID0 0x00
-#define TCAN4X5X_DEV_ID1 0x04
+#define TCAN4X5X_DEV_ID1 0x00
+#define TCAN4X5X_DEV_ID2 0x04
 #define TCAN4X5X_REV 0x08
 #define TCAN4X5X_STATUS 0x0C
 #define TCAN4X5X_ERROR_STATUS_MASK 0x10
-- 
2.40.1

[PATCH v3 5/6] can: tcan4x5x: Add support for tcan4552/4553

[Markus Schneider-Pargmann]

tcan4552 and tcan4553 do not have wake or state pins, so they are
currently not compatible with the generic driver. The generic driver
uses tcan4x5x_disable_state() and tcan4x5x_disable_wake() if the gpios
are not defined. These functions use register bits that are not
available in tcan4552/4553.

This patch adds support by introducing version information to reflect if
the chip has wake and state pins. Also the version is now checked.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 drivers/net/can/m_can/tcan4x5x-core.c | 104 ++++++++++++++++++++++----
 1 file changed, 90 insertions(+), 14 deletions(-)

diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index fb9375fa20ec..2d329b4e4f52 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -7,6 +7,7 @@
 #define TCAN4X5X_EXT_CLK_DEF 40000000
 
 #define TCAN4X5X_DEV_ID1 0x00
+#define TCAN4X5X_DEV_ID1_TCAN 0x4e414354 /* ASCII TCAN */
 #define TCAN4X5X_DEV_ID2 0x04
 #define TCAN4X5X_REV 0x08
 #define TCAN4X5X_STATUS 0x0C
@@ -103,6 +104,37 @@
 #define TCAN4X5X_WD_3_S_TIMER BIT(29)
 #define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29))
 
+struct tcan4x5x_version_info {
+	const char *name;
+	u32 id2_register;
+
+	bool has_wake_pin;
+	bool has_state_pin;
+};
+
+enum {
+	TCAN4552 = 0,
+	TCAN4553,
+	TCAN4X5X,
+};
+
+static const struct tcan4x5x_version_info tcan4x5x_versions[] = {
+	[TCAN4552] = {
+		.name = "4552",
+		.id2_register = 0x32353534,
+	},
+	[TCAN4553] = {
+		.name = "4553",
+		.id2_register = 0x32353534,
+	},
+	/* generic version with no id2_register at the end */
+	[TCAN4X5X] = {
+		.name = "generic",
+		.has_wake_pin = true,
+		.has_state_pin = true,
+	},
+};
+
 static inline struct tcan4x5x_priv *cdev_to_priv(struct m_can_classdev *cdev)
 {
 	return container_of(cdev, struct tcan4x5x_priv, cdev);
@@ -254,18 +286,53 @@ static int tcan4x5x_disable_state(struct m_can_classdev *cdev)
 				  TCAN4X5X_DISABLE_INH_MSK, 0x01);
 }
 
-static int tcan4x5x_get_gpios(struct m_can_classdev *cdev)
+static const struct tcan4x5x_version_info
+*tcan4x5x_find_version(struct tcan4x5x_priv *priv)
+{
+	u32 val;
+	int ret;
+
+	ret = regmap_read(priv->regmap, TCAN4X5X_DEV_ID1, &val);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (val != TCAN4X5X_DEV_ID1_TCAN) {
+		dev_err(&priv->spi->dev, "Not a tcan device %x\n", val);
+		return ERR_PTR(-ENODEV);
+	}
+
+	ret = regmap_read(priv->regmap, TCAN4X5X_DEV_ID2, &val);
+	if (ret)
+		return ERR_PTR(ret);
+
+	for (int i = 0; i != ARRAY_SIZE(tcan4x5x_versions); ++i) {
+		const struct tcan4x5x_version_info *vinfo = &tcan4x5x_versions[i];
+
+		if (!vinfo->id2_register || val == vinfo->id2_register) {
+			dev_info(&priv->spi->dev, "Detected TCAN device version %s\n",
+				 vinfo->name);
+			return vinfo;
+		}
+	}
+
+	return &tcan4x5x_versions[TCAN4X5X];
+}
+
+static int tcan4x5x_get_gpios(struct m_can_classdev *cdev,
+			      const struct tcan4x5x_version_info *version_info)
 {
 	struct tcan4x5x_priv *tcan4x5x = cdev_to_priv(cdev);
 	int ret;
 
-	tcan4x5x->device_wake_gpio = devm_gpiod_get(cdev->dev, "device-wake",
-						    GPIOD_OUT_HIGH);
-	if (IS_ERR(tcan4x5x->device_wake_gpio)) {
-		if (PTR_ERR(tcan4x5x->device_wake_gpio) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
+	if (version_info->has_wake_pin) {
+		tcan4x5x->device_wake_gpio = devm_gpiod_get(cdev->dev, "device-wake",
+							    GPIOD_OUT_HIGH);
+		if (IS_ERR(tcan4x5x->device_wake_gpio)) {
+			if (PTR_ERR(tcan4x5x->device_wake_gpio) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
 
-		tcan4x5x_disable_wake(cdev);
+			tcan4x5x_disable_wake(cdev);
+		}
 	}
 
 	tcan4x5x->reset_gpio = devm_gpiod_get_optional(cdev->dev, "reset",
@@ -277,12 +344,14 @@ static int tcan4x5x_get_gpios(struct m_can_classdev *cdev)
 	if (ret)
 		return ret;
 
-	tcan4x5x->device_state_gpio = devm_gpiod_get_optional(cdev->dev,
-							      "device-state",
-							      GPIOD_IN);
-	if (IS_ERR(tcan4x5x->device_state_gpio)) {
-		tcan4x5x->device_state_gpio = NULL;
-		tcan4x5x_disable_state(cdev);
+	if (version_info->has_state_pin) {
+		tcan4x5x->device_state_gpio = devm_gpiod_get_optional(cdev->dev,
+								      "device-state",
+								      GPIOD_IN);
+		if (IS_ERR(tcan4x5x->device_state_gpio)) {
+			tcan4x5x->device_state_gpio = NULL;
+			tcan4x5x_disable_state(cdev);
+		}
 	}
 
 	return 0;
@@ -299,6 +368,7 @@ static struct m_can_ops tcan4x5x_ops = {
 
 static int tcan4x5x_can_probe(struct spi_device *spi)
 {
+	const struct tcan4x5x_version_info *version_info;
 	struct tcan4x5x_priv *priv;
 	struct m_can_classdev *mcan_class;
 	int freq, ret;
@@ -361,7 +431,13 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	if (ret)
 		goto out_m_can_class_free_dev;
 
-	ret = tcan4x5x_get_gpios(mcan_class);
+	version_info = tcan4x5x_find_version(priv);
+	if (IS_ERR(version_info)) {
+		ret = PTR_ERR(version_info);
+		goto out_power;
+	}
+
+	ret = tcan4x5x_get_gpios(mcan_class, version_info);
 	if (ret)
 		goto out_power;
 
-- 
2.40.1

Re: [PATCH v3 5/6] can: tcan4x5x: Add support for tcan4552/4553

[Sean Anderson]

On 7/21/23 09:50, Markus Schneider-Pargmann wrote:
> +static const struct tcan4x5x_version_info tcan4x5x_versions[] = {
> +	[TCAN4552] = {
> +		.name = "4552",
> +		.id2_register = 0x32353534,
> +	},
> +	[TCAN4553] = {
> +		.name = "4553",
> +		.id2_register = 0x32353534,

Should this be 0x33353534?

> +	},
> +	/* generic version with no id2_register at the end */
> +	[TCAN4X5X] = {
> +		.name = "generic",
> +		.has_wake_pin = true,
> +		.has_state_pin = true,
> +	},
> +};

--Sean

Re: [PATCH v3 5/6] can: tcan4x5x: Add support for tcan4552/4553

[Markus Schneider-Pargmann]

Hi Sean,

On Fri, Sep 15, 2023 at 11:36:49AM -0400, Sean Anderson wrote:
> On 7/21/23 09:50, Markus Schneider-Pargmann wrote:
> > +static const struct tcan4x5x_version_info tcan4x5x_versions[] = {
> > +	[TCAN4552] = {
> > +		.name = "4552",
> > +		.id2_register = 0x32353534,
> > +	},
> > +	[TCAN4553] = {
> > +		.name = "4553",
> > +		.id2_register = 0x32353534,
> 
> Should this be 0x33353534?

Thank you for noticing! Yes. Probably slipped through in the last
refactoring. I will send a fix.

Best,
Markus

[PATCH v3 6/6] can: tcan4x5x: Add error messages in probe

[Markus Schneider-Pargmann]

To be able to understand issues during probe easier, add error messages
if something fails.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 drivers/net/can/m_can/tcan4x5x-core.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 2d329b4e4f52..60380b50e553 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -402,6 +402,8 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 
 	/* Sanity check */
 	if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF) {
+		dev_err(&spi->dev, "Clock frequency is out of supported range %d\n",
+			freq);
 		ret = -ERANGE;
 		goto out_m_can_class_free_dev;
 	}
@@ -420,16 +422,22 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	/* Configure the SPI bus */
 	spi->bits_per_word = 8;
 	ret = spi_setup(spi);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "SPI setup failed %d\n", ret);
 		goto out_m_can_class_free_dev;
+	}
 
 	ret = tcan4x5x_regmap_init(priv);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "regmap init failed %d\n", ret);
 		goto out_m_can_class_free_dev;
+	}
 
 	ret = tcan4x5x_power_enable(priv->power, 1);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "Enabling regulator failed %d\n", ret);
 		goto out_m_can_class_free_dev;
+	}
 
 	version_info = tcan4x5x_find_version(priv);
 	if (IS_ERR(version_info)) {
@@ -438,16 +446,22 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	}
 
 	ret = tcan4x5x_get_gpios(mcan_class, version_info);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "Getting gpios failed %d\n", ret);
 		goto out_power;
+	}
 
 	ret = tcan4x5x_init(mcan_class);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "tcan initialization failed %d\n", ret);
 		goto out_power;
+	}
 
 	ret = m_can_class_register(mcan_class);
-	if (ret)
+	if (ret) {
+		dev_err(&spi->dev, "Failed registering m_can device %d\n", ret);
 		goto out_power;
+	}
 
 	netdev_info(mcan_class->net, "TCAN4X5X successfully initialized.\n");
 	return 0;
-- 
2.40.1

Re: [PATCH v3 6/6] can: tcan4x5x: Add error messages in probe

[Marc Kleine-Budde]

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On 21.07.2023 15:50:09, Markus Schneider-Pargmann wrote:
> To be able to understand issues during probe easier, add error messages
> if something fails.

Can you print the error codes as "%pe", ERR_PTR(err)?

Marc

-- 
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Re: [PATCH v3 6/6] can: tcan4x5x: Add error messages in probe

[Markus Schneider-Pargmann]

On Mon, Jul 24, 2023 at 10:37:51AM +0200, Marc Kleine-Budde wrote:
> On 21.07.2023 15:50:09, Markus Schneider-Pargmann wrote:
> > To be able to understand issues during probe easier, add error messages
> > if something fails.
> 
> Can you print the error codes as "%pe", ERR_PTR(err)?

Yes, thank you, I will use that instead.

Best,
Markus

> 
> Marc
> 
> -- 
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