Re: [PATCH v4 4/4] can: tcan4x5x: Add tcan4x5x driver to the kernel

From: Dan Murphy
Date: Tue Jan 29 2019 - 14:27:58 EST

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Wolfgang

Sorry for the late reply

On 1/22/19 4:03 AM, Wolfgang Grandegger wrote:
> Hello,
>
> Am 17.01.19 um 21:06 schrieb Dan Murphy:
>> Add the TCAN4x5x SPI CAN driver. This device
>> uses the Bosch MCAN IP core along with a SPI
>> interface map. Leverage the MCAN common core
>> code to manage the MCAN IP.
>>
>> This device has a special method to indicate a
>> write/read operation on the data payload.
>>
>> Signed-off-by: Dan Murphy <dmurphy@xxxxxx>
>> ---
>> drivers/net/can/m_can/Kconfig | 6 +
>> drivers/net/can/m_can/tcan4x5x.c | 529 +++++++++++++++++++++++++++++++
>> 2 files changed, 535 insertions(+)
>> create mode 100644 drivers/net/can/m_can/tcan4x5x.c
>>
>> diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
>> index b1a9358b7660..b38959b3b8f1 100644
>> --- a/drivers/net/can/m_can/Kconfig
>> +++ b/drivers/net/can/m_can/Kconfig
>> @@ -15,3 +15,9 @@ config CAN_M_CAN_PLATFORM
>> tristate "Bosch M_CAN devices"
>> ---help---
>> Say Y here if you want to support for Bosch M_CAN controller.
>> +
>> +config CAN_M_CAN_TCAN4X5X
>> + depends on CAN_M_CAN
>> + tristate "TCAN4X5X M_CAN device"
>> + ---help---
>> + Say Y here if you want to support for TI M_CAN controller.
>> diff --git a/drivers/net/can/m_can/tcan4x5x.c b/drivers/net/can/m_can/tcan4x5x.c
>> new file mode 100644
>> index 000000000000..3cd6cd5052b6
>> --- /dev/null
>> +++ b/drivers/net/can/m_can/tcan4x5x.c
>> @@ -0,0 +1,529 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +// SPI to CAN driver for the Texas Instruments TCAN4x5x
>> +// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
>> +
>> +#include <linux/regmap.h>
>> +#include <linux/spi/spi.h>
>> +
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/gpio/consumer.h>
>> +
>> +#include "m_can_platform.h"
>> +
>> +#define DEVICE_NAME "tcan4x5x"
>> +#define TCAN4X5X_EXT_CLK_DEF 40000000
>> +
>> +#define TCAN4X5X_DEV_ID0 0x00
>> +#define TCAN4X5X_DEV_ID1 0x04
>> +#define TCAN4X5X_REV 0x08
>> +#define TCAN4X5X_STATUS 0x0C
>> +#define TCAN4X5X_ERROR_STATUS 0x10
>> +#define TCAN4X5X_CONTROL 0x14
>> +
>> +#define TCAN4X5X_CONFIG 0x800
>> +#define TCAN4X5X_TS_PRESCALE 0x804
>> +#define TCAN4X5X_TEST_REG 0x808
>> +#define TCAN4X5X_INT_FLAGS 0x820
>> +#define TCAN4X5X_MCAN_INT_REG 0x824
>> +#define TCAN4X5X_INT_EN 0x830
>> +
>> +
>> +/* Interrupt bits */
>> +#define TCAN4X5X_CANBUSTERMOPEN_INT_EN BIT(30)
>> +#define TCAN4X5X_CANHCANL_INT_EN BIT(29)
>> +#define TCAN4X5X_CANHBAT_INT_EN BIT(28)
>> +#define TCAN4X5X_CANLGND_INT_EN BIT(27)
>> +#define TCAN4X5X_CANBUSOPEN_INT_EN BIT(26)
>> +#define TCAN4X5X_CANBUSGND_INT_EN BIT(25)
>> +#define TCAN4X5X_CANBUSBAT_INT_EN BIT(24)
>> +#define TCAN4X5X_UVSUP_INT_EN BIT(22)
>> +#define TCAN4X5X_UVIO_INT_EN BIT(21)
>> +#define TCAN4X5X_TSD_INT_EN BIT(19)
>> +#define TCAN4X5X_ECCERR_INT_EN BIT(16)
>> +#define TCAN4X5X_CANINT_INT_EN BIT(15)
>> +#define TCAN4X5X_LWU_INT_EN BIT(14)
>> +#define TCAN4X5X_CANSLNT_INT_EN BIT(10)
>> +#define TCAN4X5X_CANDOM_INT_EN BIT(8)
>> +#define TCAN4X5X_CANBUS_ERR_INT_EN BIT(5)
>> +#define TCAN4X5X_BUS_FAULT BIT(4)
>> +#define TCAN4X5X_MCAN_INT BIT(1)
>> +#define TCAN4X5X_ENABLE_TCAN_INT (TCAN4X5X_MCAN_INT | \
>> + TCAN4X5X_BUS_FAULT | \
>> + TCAN4X5X_CANBUS_ERR_INT_EN | \
>> + TCAN4X5X_CANINT_INT_EN)
>> +
>> +/* MCAN Interrupt bits */
>> +#define TCAN4X5X_MCAN_IR_ARA BIT(29)
>> +#define TCAN4X5X_MCAN_IR_PED BIT(28)
>> +#define TCAN4X5X_MCAN_IR_PEA BIT(27)
>> +#define TCAN4X5X_MCAN_IR_WD BIT(26)
>> +#define TCAN4X5X_MCAN_IR_BO BIT(25)
>> +#define TCAN4X5X_MCAN_IR_EW BIT(24)
>> +#define TCAN4X5X_MCAN_IR_EP BIT(23)
>> +#define TCAN4X5X_MCAN_IR_ELO BIT(22)
>> +#define TCAN4X5X_MCAN_IR_BEU BIT(21)
>> +#define TCAN4X5X_MCAN_IR_BEC BIT(20)
>> +#define TCAN4X5X_MCAN_IR_DRX BIT(19)
>> +#define TCAN4X5X_MCAN_IR_TOO BIT(18)
>> +#define TCAN4X5X_MCAN_IR_MRAF BIT(17)
>> +#define TCAN4X5X_MCAN_IR_TSW BIT(16)
>> +#define TCAN4X5X_MCAN_IR_TEFL BIT(15)
>> +#define TCAN4X5X_MCAN_IR_TEFF BIT(14)
>> +#define TCAN4X5X_MCAN_IR_TEFW BIT(13)
>> +#define TCAN4X5X_MCAN_IR_TEFN BIT(12)
>> +#define TCAN4X5X_MCAN_IR_TFE BIT(11)
>> +#define TCAN4X5X_MCAN_IR_TCF BIT(10)
>> +#define TCAN4X5X_MCAN_IR_TC BIT(9)
>> +#define TCAN4X5X_MCAN_IR_HPM BIT(8)
>> +#define TCAN4X5X_MCAN_IR_RF1L BIT(7)
>> +#define TCAN4X5X_MCAN_IR_RF1F BIT(6)
>> +#define TCAN4X5X_MCAN_IR_RF1W BIT(5)
>> +#define TCAN4X5X_MCAN_IR_RF1N BIT(4)
>> +#define TCAN4X5X_MCAN_IR_RF0L BIT(3)
>> +#define TCAN4X5X_MCAN_IR_RF0F BIT(2)
>> +#define TCAN4X5X_MCAN_IR_RF0W BIT(1)
>> +#define TCAN4X5X_MCAN_IR_RF0N BIT(0)
>
> These bits are already defined in the common header file.
>

These are TCAN specific interrupt enable bits there are not in the Bosch register set

>> +#define TCAN4X5X_ENABLE_MCAN_INT (TCAN4X5X_MCAN_IR_TC | \
>> + TCAN4X5X_MCAN_IR_RF0N | \
>> + TCAN4X5X_MCAN_IR_RF1N | \
>> + TCAN4X5X_MCAN_IR_RF0F | \
>> + TCAN4X5X_MCAN_IR_RF1F)
>> +#define TCAN4X5X_MRAM_START 0x8000
>> +#define TCAN4X5X_MCAN_OFFSET 0x1000
>> +#define TCAN4X5X_MAX_REGISTER 0x8fff
>> +
>> +#define TCAN4X5X_CLEAR_ALL_INT 0xffffffff
>> +#define TCAN4X5X_SET_ALL_INT 0xffffffff
>> +
>> +#define TCAN4X5X_WRITE_CMD (0x61 << 24)
>> +#define TCAN4X5X_READ_CMD (0x41 << 24)
>> +
>> +#define TCAN4X5X_MODE_SEL_MASK (BIT(7) | BIT(6))
>> +#define TCAN4X5X_MODE_SLEEP 0x00
>> +#define TCAN4X5X_MODE_STANDBY BIT(6)
>> +#define TCAN4X5X_MODE_NORMAL BIT(7)
>> +
>> +#define TCAN4X5X_SW_RESET BIT(2)
>> +
>> +#define TCAN4X5X_MCAN_CONFIGURED BIT(5)
>> +#define TCAN4X5X_WATCHDOG_EN BIT(3)
>> +#define TCAN4X5X_WD_60_MS_TIMER 0
>> +#define TCAN4X5X_WD_600_MS_TIMER BIT(28)
>> +#define TCAN4X5X_WD_3_S_TIMER BIT(29)
>> +#define TCAN4X5X_WD_6_S_TIMER (BIT(28) | BIT(29))
>> +
>> +struct tcan4x5x_priv {
>> + struct regmap *regmap;
>> + struct spi_device *spi;
>> + struct mutex tcan4x5x_lock; /* SPI device lock */
>> +
>> + struct m_can_classdev *mcan_dev;
>> +
>> + struct gpio_desc *reset_gpio;
>> + struct gpio_desc *interrupt_gpio;
>> + struct gpio_desc *device_wake_gpio;
>> + struct gpio_desc *device_state_gpio;
>> + struct regulator *power;
>> +
>> + /* Register based ip */
>> + int mram_start;
>> + int reg_offset;
>> +};
>> +
>> +static struct can_bittiming_const tcan4x5x_bittiming_const = {
>> + .name = DEVICE_NAME,
>> + .tseg1_min = 2,
>> + .tseg1_max = 31,
>> + .tseg2_min = 2,
>> + .tseg2_max = 16,
>> + .sjw_max = 16,
>> + .brp_min = 1,
>> + .brp_max = 32,
>> + .brp_inc = 1,
>> +};
>> +
>> +static struct can_bittiming_const tcan4x5x_data_bittiming_const = {
>> + .name = DEVICE_NAME,
>> + .tseg1_min = 1,
>> + .tseg1_max = 32,
>> + .tseg2_min = 1,
>> + .tseg2_max = 16,
>> + .sjw_max = 16,
>> + .brp_min = 1,
>> + .brp_max = 32,
>> + .brp_inc = 1,
>> +};
>> +
>> +static void tcan4x5x_check_wake(struct tcan4x5x_priv *priv)
>> +{
>> + int wake_state = 0;
>> +
>> + if (priv->device_state_gpio)
>> + wake_state = gpiod_get_value(priv->device_state_gpio);
>> +
>> + if (priv->device_wake_gpio && wake_state) {
>> + gpiod_set_value(priv->device_wake_gpio, 1);
>> + udelay(100);
>> + gpiod_set_value(priv->device_wake_gpio, 0);
>> + udelay(100);
>> + gpiod_set_value(priv->device_wake_gpio, 1);
>> + }
>> +}
>> +
>> +static int regmap_spi_gather_write(void *context, const void *reg,
>> + size_t reg_len, const void *val,
>> + size_t val_len)
>> +{
>> + struct device *dev = context;
>> + struct spi_device *spi = to_spi_device(dev);
>> + struct spi_message m;
>> + u32 addr;
>> + struct spi_transfer t[2] = {{ .tx_buf = &addr, .len = reg_len, .cs_change = 0,},
>> + { .tx_buf = val, .len = val_len, },};
>> +
>> + addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 3;
>> +
>> + spi_message_init(&m);
>> + spi_message_add_tail(&t[0], &m);
>> + spi_message_add_tail(&t[1], &m);
>> +
>> + return spi_sync(spi, &m);
>> +}
>> +
>> +static int tcan4x5x_regmap_write(void *context, const void *data, size_t count)
>> +{
>> + u16 *reg = (u16 *)(data);
>> + const u32 *val = data + 4;
>> +
>> + return regmap_spi_gather_write(context, reg, 4, val, count);
>> +}
>> +
>> +static int regmap_spi_async_write(void *context,
>> + const void *reg, size_t reg_len,
>> + const void *val, size_t val_len,
>> + struct regmap_async *a)
>> +{
>> + return -ENOTSUPP;
>> +}
>> +
>> +static struct regmap_async *regmap_spi_async_alloc(void)
>> +{
>> + return NULL;
>> +}
>> +
>> +static int tcan4x5x_regmap_read(void *context,
>> + const void *reg, size_t reg_size,
>> + void *val, size_t val_size)
>> +{
>> + struct device *dev = context;
>> + struct spi_device *spi = to_spi_device(dev);
>> +
>> + u32 addr = TCAN4X5X_READ_CMD | (*((u16 *)reg) << 8) | val_size >> 2;
>> +
>> + return spi_write_then_read(spi, &addr, reg_size, (u32 *)val, val_size);
>> +}
>> +
>> +static struct regmap_bus tcan4x5x_bus = {
>> + .write = tcan4x5x_regmap_write,
>> + .gather_write = regmap_spi_gather_write,
>> + .async_write = regmap_spi_async_write,
>> + .async_alloc = regmap_spi_async_alloc,
>> + .read = tcan4x5x_regmap_read,
>> + .read_flag_mask = 0x00,
>> + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
>> + .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
>> +};
>> +
>> +static u32 tcan4x5x_read_reg(struct m_can_classdev *m_can_class, int reg)
>> +{
>> + struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)m_can_class->device_data;
>> + u32 val;
>> +
>> + tcan4x5x_check_wake(priv);
>> +
>> + regmap_read(priv->regmap, priv->reg_offset + reg, &val);
>> +
>> + return val;
>> +}
>> +
>> +static u32 tcan4x5x_read_fifo(struct m_can_classdev *m_can_class,
>> + int addr_offset)
>> +{
>> + struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)m_can_class->device_data;
>> + u32 val;
>> +
>> + tcan4x5x_check_wake(priv);
>> +
>> + regmap_read(priv->regmap, priv->mram_start + addr_offset, &val);
>> +
>> + return val;
>> +}
>> +
>> +static int tcan4x5x_write_reg(struct m_can_classdev *m_can_class,
>> + int reg, int val)
>> +{
>> + struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)m_can_class->device_data;
>> +
>> + tcan4x5x_check_wake(priv);
>> +
>> + return regmap_write(priv->regmap, priv->reg_offset + reg, val);
>> +}
>> +
>> +static int tcan4x5x_write_fifo(struct m_can_classdev *m_can_class,
>> + int addr_offset, int val)
>> +{
>> + struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)m_can_class->device_data;
>> +
>> + tcan4x5x_check_wake(priv);
>> +
>> + return regmap_write(priv->regmap, priv->mram_start + addr_offset, val);
>> +}
>> +
>> +static int tcan4x5x_power_enable(struct regulator *reg, int enable)
>> +{
>> + if (IS_ERR_OR_NULL(reg))
>> + return 0;
>> +
>> + if (enable)
>> + return regulator_enable(reg);
>> + else
>> + return regulator_disable(reg);
>> +}
>> +
>> +static int tcan4x5x_write_tcan_reg(struct m_can_classdev *m_can_class,
>> + int reg, int val)
>> +{
>> + struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)m_can_class->device_data;
>> +
>> + tcan4x5x_check_wake(priv);
>> +
>> + return regmap_write(priv->regmap, reg, val);
>> +}
>> +
>> +static int tcan4x5x_clear_interrupts(struct m_can_classdev *class_dev)
>> +{
>> + struct tcan4x5x_priv *tcan4x5x = (struct tcan4x5x_priv *)class_dev->device_data;
>> + int ret;
>> +
>> + tcan4x5x_check_wake(tcan4x5x);
>> +
>> + ret = tcan4x5x_write_tcan_reg(class_dev, TCAN4X5X_STATUS,
>> + TCAN4X5X_CLEAR_ALL_INT);
>> + if (ret)
>> + return -EIO;
>> +
>> + ret = tcan4x5x_write_tcan_reg(class_dev, TCAN4X5X_MCAN_INT_REG,
>> + TCAN4X5X_ENABLE_MCAN_INT);
>> + if (ret)
>> + return -EIO;
>> +
>> + ret = tcan4x5x_write_tcan_reg(class_dev, TCAN4X5X_INT_FLAGS,
>> + TCAN4X5X_CLEAR_ALL_INT);
>> + if (ret)
>> + return -EIO;
>> +
>> +
>> + ret = tcan4x5x_write_tcan_reg(class_dev, TCAN4X5X_ERROR_STATUS,
>> + TCAN4X5X_CLEAR_ALL_INT);
>> + if (ret)
>> + return -EIO;
>> +
>> + return ret;
>> +}
>> +
>> +static int tcan4x5x_init(struct m_can_classdev *class_dev)
>> +{
>> + struct tcan4x5x_priv *tcan4x5x = (struct tcan4x5x_priv *)class_dev->device_data;
>> + int ret;
>> +
>> + tcan4x5x_check_wake(tcan4x5x);
>> +
>> + ret = tcan4x5x_clear_interrupts(class_dev);
>> + if (ret)
>> + return ret;
>> +
>> + ret = tcan4x5x_write_tcan_reg(class_dev, TCAN4X5X_INT_EN,
>> + TCAN4X5X_ENABLE_TCAN_INT);
>> + if (ret)
>> + return -EIO;
>> +
>> + ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
>> + TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL);
>> + if (ret)
>> + return -EIO;
>> +
>> + /* Zero out the MCAN buffers */
>> + m_can_init_ram(class_dev);
>> +
>> + return ret;
>> +}
>> +
>> +static int tcan4x5x_parse_config(struct m_can_classdev *class_dev)
>> +{
>> + struct tcan4x5x_priv *tcan4x5x = (struct tcan4x5x_priv *)class_dev->device_data;
>> +
>> + tcan4x5x->reset_gpio = devm_gpiod_get_optional(class_dev->dev,
>> + "reset", GPIOD_OUT_LOW);
>> + if (IS_ERR(tcan4x5x->reset_gpio))
>> + tcan4x5x->reset_gpio = NULL;
>> +
>> + tcan4x5x->device_wake_gpio = devm_gpiod_get_optional(class_dev->dev,
>> + "device-wake",
>> + GPIOD_OUT_HIGH);
>> + if (IS_ERR(tcan4x5x->device_wake_gpio))
>> + tcan4x5x->device_wake_gpio = NULL;
>> +
>> + tcan4x5x->device_state_gpio = devm_gpiod_get_optional(class_dev->dev,
>> + "device-state",
>> + GPIOD_IN);
>> + if (IS_ERR(tcan4x5x->device_state_gpio))
>> + tcan4x5x->device_state_gpio = NULL;
>> +
>> + tcan4x5x->interrupt_gpio = devm_gpiod_get(class_dev->dev,
>> + "data-ready", GPIOD_IN);
>> + if (IS_ERR(tcan4x5x->interrupt_gpio)) {
>> + dev_err(class_dev->dev, "data-ready gpio not defined\n");
>> + return -EINVAL;
>> + }
>> +
>> + class_dev->net->irq = gpiod_to_irq(tcan4x5x->interrupt_gpio);
>> +
>> + tcan4x5x->power = devm_regulator_get_optional(class_dev->dev,
>> + "vsup");
>> + if (PTR_ERR(tcan4x5x->power) == -EPROBE_DEFER)
>> + return -EPROBE_DEFER;
>> +
>> + return 0;
>> +}
>> +
>> +static const struct regmap_config tcan4x5x_regmap = {
>> + .reg_bits = 32,
>> + .val_bits = 32,
>> + .cache_type = REGCACHE_NONE,
>> + .max_register = TCAN4X5X_MAX_REGISTER,
>> +};
>> +
>> +static int tcan4x5x_can_probe(struct spi_device *spi)
>> +{
>> + struct tcan4x5x_priv *priv;
>> + struct m_can_classdev *mcan_class;
>> + int freq, ret;
>> +
>> + mcan_class = m_can_core_allocate_dev(&spi->dev);
>> + priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
>> + if (!priv)
>> + return -ENOMEM;
>> +
>> + mcan_class->device_data = priv;
>> +
>> + m_can_core_get_clocks(mcan_class);
>> + if (IS_ERR(mcan_class->cclk)) {
>> + dev_err(&spi->dev, "no CAN clock source defined\n");
>> + freq = TCAN4X5X_EXT_CLK_DEF;
>> + } else {
>> + freq = clk_get_rate(mcan_class->cclk);
>> + }
>> +
>> + /* Sanity check */
>> + if (freq < 20000000 || freq > TCAN4X5X_EXT_CLK_DEF)
>> + return -ERANGE;
>> +
>> + priv->reg_offset = TCAN4X5X_MCAN_OFFSET;
>> + priv->mram_start = TCAN4X5X_MRAM_START;
>> + priv->spi = spi;
>> + priv->mcan_dev = mcan_class;
>> +
>> + mcan_class->pm_clock_support = 0;
>> + mcan_class->can.clock.freq = freq;
>> + mcan_class->dev = &spi->dev;
>> +
>> + mcan_class->device_init = &tcan4x5x_init;
>> + mcan_class->read_reg = &tcan4x5x_read_reg;
>> + mcan_class->write_reg = &tcan4x5x_write_reg;
>> + mcan_class->write_fifo = &tcan4x5x_write_fifo;
>> + mcan_class->read_fifo = &tcan4x5x_read_fifo;
>> + mcan_class->clr_dev_interrupts = &tcan4x5x_clear_interrupts;
>> + mcan_class->is_peripherial = true;
>> +
>> + mcan_class->bit_timing = &tcan4x5x_bittiming_const;
>> + mcan_class->data_timing = &tcan4x5x_data_bittiming_const;
>> +
>> + spi_set_drvdata(spi, priv);
>> +
>> + ret = tcan4x5x_parse_config(mcan_class);
>> + if (ret)
>> + goto out_clk;
>> +
>> + /* Configure the SPI bus */
>> + spi->bits_per_word = 32;
>> + ret = spi_setup(spi);
>> + if (ret)
>> + goto out_clk;
>> +
>> + priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus,
>> + &spi->dev, &tcan4x5x_regmap);
>> +
>> + mutex_init(&priv->tcan4x5x_lock);
>> +
>> + tcan4x5x_power_enable(priv->power, 1);
>> +
>> + ret = m_can_core_register(mcan_class);
>> + if (ret)
>> + goto reg_err;
>> +
>> + netdev_info(mcan_class->net, "TCAN4X5X successfully initialized.\n");
>> + return 0;
>> +
>> +reg_err:
>> + tcan4x5x_power_enable(priv->power, 0);
>> +out_clk:
>> + if (!IS_ERR(mcan_class->cclk)) {
>> + clk_disable_unprepare(mcan_class->cclk);
>> + clk_disable_unprepare(mcan_class->hclk);
>> + }
>> +
>> + dev_err(&spi->dev, "Probe failed, err=%d\n", -ret);
>> + return ret;
>> +}
>> +
>> +static int tcan4x5x_can_remove(struct spi_device *spi)
>> +{
>> + struct tcan4x5x_priv *priv = spi_get_drvdata(spi);
>> +
>> + tcan4x5x_power_enable(priv->power, 0);
>> +
>> + m_can_core_unregister(priv->mcan_dev);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct of_device_id tcan4x5x_of_match[] = {
>> + { .compatible = "ti,tcan4x5x", },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(of, tcan4x5x_of_match);
>> +
>> +static const struct spi_device_id tcan4x5x_id_table[] = {
>> + {
>> + .name = "tcan4x5x",
>> + .driver_data = 0,
>> + },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(spi, tcan4x5x_id_table);
>> +
>> +static struct spi_driver tcan4x5x_can_driver = {
>> + .driver = {
>> + .name = DEVICE_NAME,
>> + .of_match_table = tcan4x5x_of_match,
>> + .pm = NULL,
>> + },
>> + .id_table = tcan4x5x_id_table,
>> + .probe = tcan4x5x_can_probe,
>> + .remove = tcan4x5x_can_remove,
>> +};
>> +module_spi_driver(tcan4x5x_can_driver);
>> +
>> +MODULE_AUTHOR("Dan Murphy <dmurphy@xxxxxx>");
>> +MODULE_DESCRIPTION("Texas Instruments TCAN4x5x CAN driver");
>> +MODULE_LICENSE("GPL v2");
>
> Curious to hear about the performance of M_CAN connected via SPI. Does
> it miss or drop messages?
>

Here is some cangen data we have.

We can probably speed it up but we want to get the code functional first.

/home/root/can/ip link set can0 up type can bitrate 1000000 dbitrate 10000000 fd on
root@am335x-evm:~/can# cat /proc/net/can/stats
5681 transmitted frames (TXF)
5681 received frames (RXF)
0 matched frames (RXMF)

0 % total match ratio (RXMR)
167 frames/s total tx rate (TXR)
167 frames/s total rx rate (RXR)

0 % current match ratio (CRXMR)
0 frames/s current tx rate (CTXR)
0 frames/s current rx rate (CRXR)

0 % max match ratio (MRXMR)
224 frames/s max tx rate (MTXR)
222 frames/s max rx rate (MRXR)

> Thanks for your patience,
>
> Wolfgang.
>

--
------------------
Dan Murphy

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