[PATCH v2 0/2] phy: add basic support for NXPs TJA1145 CAN transceiver

[PATCH v2 0/2] phy: add basic support for NXPs TJA1145 CAN transceiver

[Dimitri Fedrau via B4 Relay]

Add basic driver support for NXPs TJA1145 CAN transceiver which brings the
PHY up/down by switching to normal/standby mode using SPI commands.

Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
---
Changes in v2:
- bindings: Change node name in example to can-phy
- bindings: Fix order of properties, reg property is second
- bindings: Change compatible to match filename
- change compatible to nxp,tja1145-can
- Link to v1: https://lore.kernel.org/r/20250728-tja1145-support-v1-0-ebd8494d545c@liebherr.com

---
Dimitri Fedrau (2):
      dt-bindings: phy: add support for NXPs TJA1145 CAN transceiver
      phy: add basic support for NXPs TJA1145 CAN transceiver

 .../devicetree/bindings/phy/nxp,tja1145-can.yaml   |  79 +++++++++
 drivers/phy/Kconfig                                |  10 ++
 drivers/phy/Makefile                               |   1 +
 drivers/phy/phy-nxp-tja1145.c                      | 185 +++++++++++++++++++++
 4 files changed, 275 insertions(+)
---
base-commit: e373c183bc8a4a421f14ea0dd1edf4f8fd79537f
change-id: 20250726-tja1145-support-d6ccdc4d2da3

Best regards,
-- 
Dimitri Fedrau <dimitri.fedrau@liebherr.com>

[PATCH v2 1/2] dt-bindings: phy: add support for NXPs TJA1145 CAN transceiver

[Dimitri Fedrau via B4 Relay]

From: Dimitri Fedrau <dimitri.fedrau@liebherr.com>

Adding documentation for NXPs TJA1145 CAN transceiver.

Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
---
 .../devicetree/bindings/phy/nxp,tja1145-can.yaml   | 79 ++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/nxp,tja1145-can.yaml b/Documentation/devicetree/bindings/phy/nxp,tja1145-can.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..12a8880267ef65cd9c55dd542f053ae967c7d6f3
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/nxp,tja1145-can.yaml
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/nxp,tja1145-can.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TJA1145 CAN transceiver
+
+maintainers:
+  - Dimitri Fedrau <dimitri.fedrau@liebherr.com>
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    const: nxp,tja1145-can
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 0
+
+  spi-max-frequency:
+    maximum: 4000000
+
+  spi-cpha: true
+
+  spi-cs-setup-delay-ns:
+    minimum: 50
+    default: 50
+
+  spi-cs-hold-delay-ns:
+    minimum: 50
+    default: 50
+
+  spi-cs-inactive-delay-ns:
+    minimum: 250
+    default: 250
+
+  vcc-supply:
+    description:
+      CAN transceiver supply voltage
+
+  vio-supply:
+    description:
+      Supply voltage for I/O level adaptor
+
+  vbat-supply:
+    description:
+      Battery supply voltage
+
+required:
+  - compatible
+  - reg
+  - "#phy-cells"
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        can-phy {
+            compatible = "nxp,tja1145-can";
+            reg = <0>;
+            #phy-cells = <0>;
+            spi-max-frequency = <4000000>;
+            spi-cpha;
+            spi-cs-setup-delay-ns = <50>;
+            spi-cs-hold-delay-ns = <50>;
+            spi-cs-inactive-delay-ns = <250>;
+            vcc-supply = <&reg_5v0>;
+            vio-supply = <&reg_3v3>;
+            vbat-supply = <&reg_24v0>;
+        };
+    };

-- 
2.39.5

Re: [PATCH v2 1/2] dt-bindings: phy: add support for NXPs TJA1145 CAN transceiver

[Krzysztof Kozlowski]

On 29/08/2025 11:19, Dimitri Fedrau via B4 Relay wrote:
> From: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
> 
> Adding documentation for NXPs TJA1145 CAN transceiver.

Pity you did not include resolution of discussions about directory and
can phy bindings here. You have entire commit msg for that, but instead
it is a copy paste of subject.

> 
> Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
> ---
>  .../devicetree/bindings/phy/nxp,tja1145-can.yaml   | 79 ++++++++++++++++++++++
>  1 file changed, 79 insertions(+)

> 


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof

Re: [PATCH v2 1/2] dt-bindings: phy: add support for NXPs TJA1145 CAN transceiver

[Krzysztof Kozlowski]

On 29/08/2025 15:12, Krzysztof Kozlowski wrote:
> On 29/08/2025 11:19, Dimitri Fedrau via B4 Relay wrote:
>> From: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
>>
>> Adding documentation for NXPs TJA1145 CAN transceiver.
> 
> Pity you did not include resolution of discussions about directory and
> can phy bindings here. You have entire commit msg for that, but instead
> it is a copy paste of subject.
> 
>>
>> Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
>> ---
>>  .../devicetree/bindings/phy/nxp,tja1145-can.yaml   | 79 ++++++++++++++++++++++
>>  1 file changed, 79 insertions(+)
> 
>>
> 
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

And un-reviewed, I missed messed example and this was never tested.

Sending untested code only makes us grumpy.

Best regards,
Krzysztof

Re: [PATCH v2 1/2] dt-bindings: phy: add support for NXPs TJA1145 CAN transceiver

[Rob Herring (Arm)]

On Fri, 29 Aug 2025 11:19:58 +0200, Dimitri Fedrau wrote:
> Adding documentation for NXPs TJA1145 CAN transceiver.
> 
> Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
> ---
>  .../devicetree/bindings/phy/nxp,tja1145-can.yaml   | 79 ++++++++++++++++++++++
>  1 file changed, 79 insertions(+)
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
Documentation/devicetree/bindings/phy/nxp,tja1145-can.example.dts:21.21-33.15: Warning (unit_address_vs_reg): /example-0/spi/can-phy: node has a reg or ranges property, but no unit name
Documentation/devicetree/bindings/phy/nxp,tja1145-can.example.dts:21.21-33.15: Warning (spi_bus_reg): /example-0/spi/can-phy: SPI bus unit address format error, expected "0"

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20250829-tja1145-support-v2-1-60997f328979@liebherr.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

[PATCH v2 2/2] phy: add basic support for NXPs TJA1145 CAN transceiver

[Dimitri Fedrau via B4 Relay]

From: Dimitri Fedrau <dimitri.fedrau@liebherr.com>

Add basic driver support for NXPs TJA1145 CAN transceiver which brings the
PHY up/down by switching to normal/standby mode using SPI commands.

Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
---
 drivers/phy/Kconfig           |  10 +++
 drivers/phy/Makefile          |   1 +
 drivers/phy/phy-nxp-tja1145.c | 185 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 196 insertions(+)

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 58c911e1b2d20a0398f02550e938ce62633230d4..c47e2b62fa6279ee610493b028d3c14f6499ca85 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -101,6 +101,16 @@ config PHY_NXP_PTN3222
 	  schemes. It supports all three USB 2.0 data rates: Low Speed, Full
 	  Speed and High Speed.
 
+config PHY_NXP_TJA1145
+	tristate "NXP TJA1145 CAN transceiver PHY"
+	select GENERIC_PHY
+	select REGMAP_SPI
+	depends on SPI
+	help
+	  This option enables support for NXPs TJA1145 CAN transceiver as a PHY.
+	  This driver provides function for putting the transceiver in various
+	  functional modes using SPI commands.
+
 source "drivers/phy/allwinner/Kconfig"
 source "drivers/phy/amlogic/Kconfig"
 source "drivers/phy/broadcom/Kconfig"
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index c670a8dac46807863c9ef990beb149082238ad16..16da564c74b0f14befb486366dcd10cd5fc67741 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_PHY_SNPS_EUSB2)		+= phy-snps-eusb2.o
 obj-$(CONFIG_USB_LGM_PHY)		+= phy-lgm-usb.o
 obj-$(CONFIG_PHY_AIROHA_PCIE)		+= phy-airoha-pcie.o
 obj-$(CONFIG_PHY_NXP_PTN3222)		+= phy-nxp-ptn3222.o
+obj-$(CONFIG_PHY_NXP_TJA1145)		+= phy-nxp-tja1145.o
 obj-y					+= allwinner/	\
 					   amlogic/	\
 					   broadcom/	\
diff --git a/drivers/phy/phy-nxp-tja1145.c b/drivers/phy/phy-nxp-tja1145.c
new file mode 100644
index 0000000000000000000000000000000000000000..4d3aa5bfcd88d5755fa37e0d42bfa8293dee2155
--- /dev/null
+++ b/drivers/phy/phy-nxp-tja1145.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2025 Liebherr-Electronics and Drives GmbH
+ */
+#include <linux/bitfield.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include <linux/phy/phy.h>
+#include <linux/spi/spi.h>
+
+#define TJA1145_MODE_CTRL		0x01
+#define TJA1145_MODE_CTRL_MC		GENMASK(2, 0)
+#define TJA1145_MODE_CRTL_STBY		BIT(2)
+#define TJA1145_MODE_CRTL_NORMAL	TJA1145_MODE_CTRL_MC
+
+#define TJA1145_CAN_CTRL		0x20
+#define TJA1145_CAN_CTRL_CMC		GENMASK(1, 0)
+#define TJA1145_CAN_CTRL_ACTIVE		BIT(1)
+
+#define TJA1145_IDENT			0x7e
+#define TJA1145_IDENT_TJA1145T		0x70
+
+#define TJA1145_SPI_READ_BIT		BIT(0)
+#define TJA1145T_MAX_BITRATE		1000000
+
+static int tja1145_phy_power_on(struct phy *phy)
+{
+	struct regmap *map = phy_get_drvdata(phy);
+	int ret;
+
+	/*
+	 * Switch operating mode to normal which is the active operating mode.
+	 * In this mode, the device is fully operational.
+	 */
+	ret = regmap_update_bits(map, TJA1145_MODE_CTRL, TJA1145_MODE_CTRL_MC,
+				 TJA1145_MODE_CRTL_NORMAL);
+	if (ret)
+		return ret;
+
+	/*
+	 * Switch to CAN operating mode active where the PHY can transmit and
+	 * receive data.
+	 */
+	return regmap_update_bits(map, TJA1145_CAN_CTRL, TJA1145_CAN_CTRL_CMC,
+				  TJA1145_CAN_CTRL_ACTIVE);
+}
+
+static int tja1145_phy_power_off(struct phy *phy)
+{
+	struct regmap *map = phy_get_drvdata(phy);
+
+	/*
+	 * Switch to operating mode standby, the PHY is unable to transmit or
+	 * receive data in standby mode.
+	 */
+	return regmap_update_bits(map, TJA1145_MODE_CTRL, TJA1145_MODE_CTRL_MC,
+				  TJA1145_MODE_CRTL_STBY);
+}
+
+static const struct phy_ops tja1145_phy_ops = {
+	.power_on = tja1145_phy_power_on,
+	.power_off = tja1145_phy_power_off,
+};
+
+static const struct regmap_range tja1145_wr_holes_ranges[] = {
+	regmap_reg_range(0x00, 0x00),
+	regmap_reg_range(0x02, 0x03),
+	regmap_reg_range(0x05, 0x05),
+	regmap_reg_range(0x0b, 0x1f),
+	regmap_reg_range(0x21, 0x22),
+	regmap_reg_range(0x24, 0x25),
+	regmap_reg_range(0x30, 0x4b),
+	regmap_reg_range(0x4d, 0x60),
+	regmap_reg_range(0x62, 0x62),
+	regmap_reg_range(0x65, 0x67),
+	regmap_reg_range(0x70, 0xff),
+};
+
+static const struct regmap_access_table tja1145_wr_table = {
+	.no_ranges = tja1145_wr_holes_ranges,
+	.n_no_ranges = ARRAY_SIZE(tja1145_wr_holes_ranges),
+};
+
+static const struct regmap_range tja1145_rd_holes_ranges[] = {
+	regmap_reg_range(0x00, 0x00),
+	regmap_reg_range(0x02, 0x02),
+	regmap_reg_range(0x05, 0x05),
+	regmap_reg_range(0x0b, 0x1f),
+	regmap_reg_range(0x21, 0x21),
+	regmap_reg_range(0x24, 0x25),
+	regmap_reg_range(0x30, 0x4a),
+	regmap_reg_range(0x4d, 0x5f),
+	regmap_reg_range(0x62, 0x62),
+	regmap_reg_range(0x65, 0x67),
+	regmap_reg_range(0x70, 0x7d),
+	regmap_reg_range(0x7f, 0xff),
+};
+
+static const struct regmap_access_table tja1145_rd_table = {
+	.no_ranges = tja1145_rd_holes_ranges,
+	.n_no_ranges = ARRAY_SIZE(tja1145_rd_holes_ranges),
+};
+
+
+static const struct regmap_config tja1145_regmap_config = {
+	.reg_bits = 8,
+	.reg_shift = -1,
+	.val_bits = 8,
+	.wr_table = &tja1145_wr_table,
+	.rd_table = &tja1145_rd_table,
+	.read_flag_mask = TJA1145_SPI_READ_BIT,
+	.max_register = TJA1145_IDENT,
+};
+
+static int tja1145_check_ident(struct device *dev, struct regmap *map)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(map, TJA1145_IDENT, &val);
+	if (ret)
+		return ret;
+
+	if (val != TJA1145_IDENT_TJA1145T) {
+		dev_err(dev, "Expected device id: 0x%02x, got: 0x%02x\n",
+			TJA1145_IDENT_TJA1145T, val);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int tja1145_probe(struct spi_device *spi)
+{
+	struct phy_provider *phy_provider;
+	struct device *dev = &spi->dev;
+	struct regmap *map;
+	struct phy *phy;
+	int ret;
+
+	map = devm_regmap_init_spi(spi, &tja1145_regmap_config);
+	if (IS_ERR(map))
+		return dev_err_probe(dev, PTR_ERR(map), "failed to init regmap\n");
+
+	ret = tja1145_check_ident(dev, map);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to identify device\n");
+
+	phy = devm_phy_create(dev, dev->of_node, &tja1145_phy_ops);
+	if (IS_ERR(phy))
+		return dev_err_probe(dev, PTR_ERR(phy), "failed to create PHY\n");
+
+	phy->attrs.max_link_rate = TJA1145T_MAX_BITRATE;
+	phy_set_drvdata(phy, map);
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct spi_device_id tja1145_spi_id[] = {
+	{ "tja1145" },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, tja1145_spi_id);
+
+static const struct of_device_id tja1145_of_match[] = {
+	{ .compatible = "nxp,tja1145-can" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tja1145_of_match);
+
+static struct spi_driver tja1145_driver = {
+	.driver = {
+		.name = "tja1145",
+		.of_match_table = tja1145_of_match,
+	},
+	.probe = tja1145_probe,
+	.id_table = tja1145_spi_id,
+};
+module_spi_driver(tja1145_driver);
+
+MODULE_DESCRIPTION("NXP TJA1145 CAN transceiver PHY driver");
+MODULE_AUTHOR("Dimitri Fedrau <dimitri.fedrau@liebherr.com>");
+MODULE_LICENSE("GPL");

-- 
2.39.5