Re: [PATCH v4 2/4] can: m_can: Migrate the m_can code to use the framework

Wolfgang Grandegger
2019-01-22T09:35:45Z

Hello,

Am 17.01.19 um 21:05 schrieb Dan Murphy:
> Migrate the m_can code to use the m_can_platform framework
> code.
>
> Signed-off-by: Dan Murphy <dmurphy@ti.com>
> ---
> drivers/net/can/m_can/Kconfig | 12 +
> drivers/net/can/m_can/Makefile | 4 +-
> drivers/net/can/m_can/m_can.c | 764 ++++++++++++-------------
> drivers/net/can/m_can/m_can_platform.h | 2 +-
> 4 files changed, 374 insertions(+), 408 deletions(-)
>
> diff --git a/drivers/net/can/m_can/Kconfig b/drivers/net/can/m_can/Kconfig
> index 04f20dd39007..b1a9358b7660 100644
> --- a/drivers/net/can/m_can/Kconfig
> +++ b/drivers/net/can/m_can/Kconfig
> @@ -1,5 +1,17 @@
> config CAN_M_CAN
> + tristate "Bosch M_CAN support"
> + ---help---
> + Say Y here if you want to support for Bosch M_CAN controller.
> +
> +config CAN_M_CAN_CORE
> + depends on CAN_M_CAN
> + tristate "Bosch M_CAN Core support"
> + ---help---
> + Say Y here if you want to support for Bosch M_CAN controller.

Do you need that extra config? I think "CAN_M_CAN" is just fine.

> +config CAN_M_CAN_PLATFORM
> depends on HAS_IOMEM
> + depends on CAN_M_CAN_CORE
> tristate "Bosch M_CAN devices"
> ---help---
> Say Y here if you want to support for Bosch M_CAN controller.
> diff --git a/drivers/net/can/m_can/Makefile b/drivers/net/can/m_can/Makefile
> index 8bbd7f24f5be..04f36947ac3b 100644
> --- a/drivers/net/can/m_can/Makefile
> +++ b/drivers/net/can/m_can/Makefile
> @@ -2,4 +2,6 @@
> # Makefile for the Bosch M_CAN controller driver.
> #
>
> -obj-$(CONFIG_CAN_M_CAN) += m_can.o
> +obj-$(CONFIG_CAN_M_CAN_CORE) += m_can.o
> +obj-$(CONFIG_CAN_M_CAN_PLATFORM) += m_can_platform.o
> +obj-$(CONFIG_CAN_M_CAN_TCAN4X5X) += tcan4x5x.o

This file is provided in a sub-sequent patched! The code *must* compile
for every single patch applied for bisect'ing. Looking to your first
patch, I just realize that this is also not the case!

I think it makes sense to squash patch 1 and 2.

> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
> index f817b28582e9..6da0ae26138e 100644
> --- a/drivers/net/can/m_can/m_can.c
> +++ b/drivers/net/can/m_can/m_can.c
> @@ -28,87 +28,14 @@
> #include <linux/can/dev.h>
> #include <linux/pinctrl/consumer.h>
>
> +#include "m_can_platform.h"
> +
> /* napi related */
> #define M_CAN_NAPI_WEIGHT 64
>
> /* message ram configuration data length */
> #define MRAM_CFG_LEN 8
>
> -/* registers definition */
> -enum m_can_reg {
> - M_CAN_CREL = 0x0,
> - M_CAN_ENDN = 0x4,
> - M_CAN_CUST = 0x8,
> - M_CAN_DBTP = 0xc,
> - M_CAN_TEST = 0x10,
> - M_CAN_RWD = 0x14,
> - M_CAN_CCCR = 0x18,
> - M_CAN_NBTP = 0x1c,
> - M_CAN_TSCC = 0x20,
> - M_CAN_TSCV = 0x24,
> - M_CAN_TOCC = 0x28,
> - M_CAN_TOCV = 0x2c,
> - M_CAN_ECR = 0x40,
> - M_CAN_PSR = 0x44,
> -/* TDCR Register only available for version >=3.1.x */
> - M_CAN_TDCR = 0x48,
> - M_CAN_IR = 0x50,
> - M_CAN_IE = 0x54,
> - M_CAN_ILS = 0x58,
> - M_CAN_ILE = 0x5c,
> - M_CAN_GFC = 0x80,
> - M_CAN_SIDFC = 0x84,
> - M_CAN_XIDFC = 0x88,
> - M_CAN_XIDAM = 0x90,
> - M_CAN_HPMS = 0x94,
> - M_CAN_NDAT1 = 0x98,
> - M_CAN_NDAT2 = 0x9c,
> - M_CAN_RXF0C = 0xa0,
> - M_CAN_RXF0S = 0xa4,
> - M_CAN_RXF0A = 0xa8,
> - M_CAN_RXBC = 0xac,
> - M_CAN_RXF1C = 0xb0,
> - M_CAN_RXF1S = 0xb4,
> - M_CAN_RXF1A = 0xb8,
> - M_CAN_RXESC = 0xbc,
> - M_CAN_TXBC = 0xc0,
> - M_CAN_TXFQS = 0xc4,
> - M_CAN_TXESC = 0xc8,
> - M_CAN_TXBRP = 0xcc,
> - M_CAN_TXBAR = 0xd0,
> - M_CAN_TXBCR = 0xd4,
> - M_CAN_TXBTO = 0xd8,
> - M_CAN_TXBCF = 0xdc,
> - M_CAN_TXBTIE = 0xe0,
> - M_CAN_TXBCIE = 0xe4,
> - M_CAN_TXEFC = 0xf0,
> - M_CAN_TXEFS = 0xf4,
> - M_CAN_TXEFA = 0xf8,
> -};
> -
> -/* m_can lec values */
> -enum m_can_lec_type {
> - LEC_NO_ERROR = 0,
> - LEC_STUFF_ERROR,
> - LEC_FORM_ERROR,
> - LEC_ACK_ERROR,
> - LEC_BIT1_ERROR,
> - LEC_BIT0_ERROR,
> - LEC_CRC_ERROR,
> - LEC_UNUSED,
> -};
> -
> -enum m_can_mram_cfg {
> - MRAM_SIDF = 0,
> - MRAM_XIDF,
> - MRAM_RXF0,
> - MRAM_RXF1,
> - MRAM_RXB,
> - MRAM_TXE,
> - MRAM_TXB,
> - MRAM_CFG_NUM,
> -};

Patch 1 should have already done that!

> /* Core Release Register (CREL) */
> #define CREL_REL_SHIFT 28
> #define CREL_REL_MASK (0xF << CREL_REL_SHIFT)
> @@ -343,72 +270,81 @@ enum m_can_mram_cfg {
> #define TX_BUF_MM_MASK (0xff << TX_BUF_MM_SHIFT)
>
> /* Tx event FIFO Element */
> -/* E1 */
> #define TX_EVENT_MM_SHIFT TX_BUF_MM_SHIFT
> #define TX_EVENT_MM_MASK (0xff << TX_EVENT_MM_SHIFT)
>
> -/* address offset and element number for each FIFO/Buffer in the Message RAM */
> -struct mram_cfg {
> - u16 off;
> - u8 num;
> -};
> +static u32 m_can_read(struct m_can_classdev *priv, enum m_can_reg reg)
> +{
> + u32 ret = -EINVAL;
>
> -/* m_can private data structure */
> -struct m_can_priv {
> - struct can_priv can; /* must be the first member */
> - struct napi_struct napi;
> - struct net_device *dev;
> - struct device *device;
> - struct clk *hclk;
> - struct clk *cclk;
> - void __iomem *base;
> - u32 irqstatus;
> - int version;
> -
> - /* message ram configuration */
> - void __iomem *mram_base;
> - struct mram_cfg mcfg[MRAM_CFG_NUM];
> -};
> + if (priv->read_reg)
> + ret = priv->read_reg(priv, reg);
>
> -static inline u32 m_can_read(const struct m_can_priv *priv, enum m_can_reg reg)
> + return ret;
> +}
> +
> +static int m_can_write(struct m_can_classdev *priv, enum m_can_reg reg, u32 val)
> {
> - return readl(priv->base + reg);
> + int ret = -EINVAL;
> +
> + if (priv->write_reg)
> + ret = priv->write_reg(priv, reg, val);
> +
> + return ret;
> }
>
> -static inline void m_can_write(const struct m_can_priv *priv,
> - enum m_can_reg reg, u32 val)
> +static u32 m_can_fifo_read(struct m_can_classdev *priv,
> + u32 fgi, unsigned int offset)
> {
> - writel(val, priv->base + reg);
> + u32 addr_offset = priv->mcfg[MRAM_RXF0].off + fgi * RXF0_ELEMENT_SIZE + offset;
> + u32 ret = -EINVAL;
> +
> + if (priv->read_fifo)
> + ret = priv->read_fifo(priv, addr_offset);
> +
> + return ret;
> }
>
> -static inline u32 m_can_fifo_read(const struct m_can_priv *priv,
> - u32 fgi, unsigned int offset)
> +static u32 m_can_fifo_write(struct m_can_classdev *priv,
> + u32 fpi, unsigned int offset, u32 val)
> {
> - return readl(priv->mram_base + priv->mcfg[MRAM_RXF0].off +
> - fgi * RXF0_ELEMENT_SIZE + offset);
> + u32 addr_offset = priv->mcfg[MRAM_TXB].off + fpi * TXB_ELEMENT_SIZE + offset;
> + u32 ret = -EINVAL;
> +
> + if (priv->write_fifo)
> + ret = priv->write_fifo(priv, addr_offset, val);
> +
> + return ret;

Why not just:

if (priv->write_fifo)
return priv->write_fifo(priv, addr_offset, val);
else
return -EINVAL;

Here and below...

> }
>
> -static inline void m_can_fifo_write(const struct m_can_priv *priv,
> - u32 fpi, unsigned int offset, u32 val)
> +static u32 m_can_fifo_write_no_off(struct m_can_classdev *priv,
> + u32 fpi, u32 val)
> {
> - writel(val, priv->mram_base + priv->mcfg[MRAM_TXB].off +
> - fpi * TXB_ELEMENT_SIZE + offset);
> + u32 ret = 0;
> +
> + if (priv->write_fifo)
> + ret = priv->write_fifo(priv, fpi, val);
> +
> + return ret;
> }
>
> -static inline u32 m_can_txe_fifo_read(const struct m_can_priv *priv,
> - u32 fgi,
> - u32 offset) {
> - return readl(priv->mram_base + priv->mcfg[MRAM_TXE].off +
> - fgi * TXE_ELEMENT_SIZE + offset);
> +static u32 m_can_txe_fifo_read(struct m_can_classdev *priv, u32 fgi, u32 offset)
> +{
> + u32 addr_offset = priv->mcfg[MRAM_TXE].off + fgi * TXE_ELEMENT_SIZE + offset;
> + u32 ret = -EINVAL;
> +
> + if (priv->read_fifo)
> + ret = priv->read_fifo(priv, addr_offset);
> +
> + return ret;
> }
>
> -static inline bool m_can_tx_fifo_full(const struct m_can_priv *priv)
> +static inline bool m_can_tx_fifo_full(struct m_can_classdev *priv)
> {
> - return !!(m_can_read(priv, M_CAN_TXFQS) & TXFQS_TFQF);
> + return !!(m_can_read(priv, M_CAN_TXFQS) & TXFQS_TFQF);
> }
>
> -static inline void m_can_config_endisable(const struct m_can_priv *priv,
> - bool enable)
> +void m_can_config_endisable(struct m_can_classdev *priv, bool enable)
> {
> u32 cccr = m_can_read(priv, M_CAN_CCCR);
> u32 timeout = 10;
> @@ -433,7 +369,7 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv,
>
> while ((m_can_read(priv, M_CAN_CCCR) & (CCCR_INIT | CCCR_CCE)) != val) {
> if (timeout == 0) {
> - netdev_warn(priv->dev, "Failed to init module\n");
> + netdev_warn(priv->net, "Failed to init module\n");
> return;
> }
> timeout--;
> @@ -441,13 +377,13 @@ static inline void m_can_config_endisable(const struct m_can_priv *priv,
> }
> }
>
> -static inline void m_can_enable_all_interrupts(const struct m_can_priv *priv)
> +static inline void m_can_enable_all_interrupts(struct m_can_classdev *priv)
> {
> /* Only interrupt line 0 is used in this driver */
> m_can_write(priv, M_CAN_ILE, ILE_EINT0);
> }
>
> -static inline void m_can_disable_all_interrupts(const struct m_can_priv *priv)
> +static inline void m_can_disable_all_interrupts(struct m_can_classdev *priv)
> {
> m_can_write(priv, M_CAN_ILE, 0x0);
> }
> @@ -455,7 +391,7 @@ static inline void m_can_disable_all_interrupts(const struct m_can_priv *priv)
> static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
> {
> struct net_device_stats *stats = &dev->stats;
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> struct canfd_frame *cf;
> struct sk_buff *skb;
> u32 id, fgi, dlc;
> @@ -512,7 +448,7 @@ static void m_can_read_fifo(struct net_device *dev, u32 rxfs)
>
> static int m_can_do_rx_poll(struct net_device *dev, int quota)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> u32 pkts = 0;
> u32 rxfs;
>
> @@ -565,7 +501,7 @@ static int m_can_handle_lost_msg(struct net_device *dev)
> static int m_can_handle_lec_err(struct net_device *dev,
> enum m_can_lec_type lec_type)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> struct net_device_stats *stats = &dev->stats;
> struct can_frame *cf;
> struct sk_buff *skb;
> @@ -622,7 +558,7 @@ static int m_can_handle_lec_err(struct net_device *dev,
> static int __m_can_get_berr_counter(const struct net_device *dev,
> struct can_berr_counter *bec)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);

Back to the naming: You use "priv" here because I only wanted to see
minimal changes to the m_can code. Why not also re-using "struct
m_can_priv" for the moment and use:

m_can_register(struct m_can_priv priv);

Later-on, when the development has settled, we could introduce betetr
names. What do you think?

> unsigned int ecr;
>
> ecr = m_can_read(priv, M_CAN_ECR);
> @@ -632,28 +568,32 @@ static int __m_can_get_berr_counter(const struct net_device *dev,
> return 0;
> }
>
> -static int m_can_clk_start(struct m_can_priv *priv)
> +static int m_can_clk_start(struct m_can_classdev *priv)
> {
> int err;
>
> - err = pm_runtime_get_sync(priv->device);
> + if (priv->pm_clock_support == 0)
> + return 0;
> +
> + err = pm_runtime_get_sync(priv->dev);
> if (err < 0) {
> - pm_runtime_put_noidle(priv->device);
> + pm_runtime_put_noidle(priv->dev);
> return err;
> }
>
> return 0;
> }
>
> -static void m_can_clk_stop(struct m_can_priv *priv)
> +static void m_can_clk_stop(struct m_can_classdev *priv)
> {
> - pm_runtime_put_sync(priv->device);
> + if (priv->pm_clock_support)
> + pm_runtime_put_sync(priv->dev);
> }
>
> static int m_can_get_berr_counter(const struct net_device *dev,
> struct can_berr_counter *bec)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> int err;
>
> err = m_can_clk_start(priv);
> @@ -670,7 +610,7 @@ static int m_can_get_berr_counter(const struct net_device *dev,
> static int m_can_handle_state_change(struct net_device *dev,
> enum can_state new_state)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> struct net_device_stats *stats = &dev->stats;
> struct can_frame *cf;
> struct sk_buff *skb;
> @@ -744,25 +684,22 @@ static int m_can_handle_state_change(struct net_device *dev,
>
> static int m_can_handle_state_errors(struct net_device *dev, u32 psr)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> int work_done = 0;
>
> - if ((psr & PSR_EW) &&
> - (priv->can.state != CAN_STATE_ERROR_WARNING)) {
> + if ((psr & PSR_EW) && priv->can.state != CAN_STATE_ERROR_WARNING) {

This is an unrelated cosmetic change. We should avoid them here.
Could be done later-on with an extra patch.

> netdev_dbg(dev, "entered error warning state\n");
> work_done += m_can_handle_state_change(dev,
> CAN_STATE_ERROR_WARNING);
> }
>
> - if ((psr & PSR_EP) &&
> - (priv->can.state != CAN_STATE_ERROR_PASSIVE)) {
> + if ((psr & PSR_EP) && priv->can.state != CAN_STATE_ERROR_PASSIVE) {
> netdev_dbg(dev, "entered error passive state\n");
> work_done += m_can_handle_state_change(dev,
> CAN_STATE_ERROR_PASSIVE);
> }
>
> - if ((psr & PSR_BO) &&
> - (priv->can.state != CAN_STATE_BUS_OFF)) {
> + if ((psr & PSR_BO) && priv->can.state != CAN_STATE_BUS_OFF) {
> netdev_dbg(dev, "entered error bus off state\n");
> work_done += m_can_handle_state_change(dev,
> CAN_STATE_BUS_OFF);
> @@ -797,7 +734,7 @@ static inline bool is_lec_err(u32 psr)
> static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus,
> u32 psr)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> int work_done = 0;
>
> if (irqstatus & IR_RF0L)
> @@ -814,10 +751,9 @@ static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus,
> return work_done;
> }
>
> -static int m_can_poll(struct napi_struct *napi, int quota)
> +static int m_can_rx_handler(struct net_device *dev, int quota)
> {
> - struct net_device *dev = napi->dev;
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> int work_done = 0;
> u32 irqstatus, psr;
>
> @@ -834,13 +770,33 @@ static int m_can_poll(struct napi_struct *napi, int quota)
>
> if (irqstatus & IR_RF0N)
> work_done += m_can_do_rx_poll(dev, (quota - work_done));
> +end:
> + return work_done;
> +}
> +
> +static int m_can_rx(struct net_device *dev)

m_can_rx_peripheral ?

> +{
> + struct m_can_classdev *priv = netdev_priv(dev);
>
> + m_can_rx_handler(dev, 1);
> +
> + m_can_enable_all_interrupts(priv);
> +
> + return 0;
> +}
> +
> +static int m_can_poll(struct napi_struct *napi, int quota)
> +{
> + struct net_device *dev = napi->dev;
> + struct m_can_classdev *priv = netdev_priv(dev);
> + int work_done = 0;
> +
> + work_done = m_can_rx_handler(dev, quota);
> if (work_done < quota) {
> napi_complete_done(napi, work_done);
> m_can_enable_all_interrupts(priv);
> }
>
> -end:
> return work_done;
> }
>
> @@ -852,7 +808,7 @@ static void m_can_echo_tx_event(struct net_device *dev)
> int i = 0;
> unsigned int msg_mark;
>
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> struct net_device_stats *stats = &dev->stats;
>
> /* read tx event fifo status */
> @@ -885,7 +841,7 @@ static void m_can_echo_tx_event(struct net_device *dev)
> static irqreturn_t m_can_isr(int irq, void *dev_id)
> {
> struct net_device *dev = (struct net_device *)dev_id;
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> struct net_device_stats *stats = &dev->stats;
> u32 ir;
>
> @@ -905,7 +861,10 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
> if ((ir & IR_RF0N) || (ir & IR_ERR_ALL_30X)) {
> priv->irqstatus = ir;
> m_can_disable_all_interrupts(priv);
> - napi_schedule(&priv->napi);
> + if (!priv->is_peripherial)
> + napi_schedule(&priv->napi);
> + else
> + m_can_rx(dev);
> }
>
> if (priv->version == 30) {
> @@ -927,6 +886,9 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
> }
> }
>
> + if (priv->clr_dev_interrupts)
> + priv->clr_dev_interrupts(priv);
> +
> return IRQ_HANDLED;
> }
>
> @@ -980,7 +942,7 @@ static const struct can_bittiming_const m_can_data_bittiming_const_31X = {
>
> static int m_can_set_bittiming(struct net_device *dev)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> const struct can_bittiming *bt = &priv->can.bittiming;
> const struct can_bittiming *dbt = &priv->can.data_bittiming;
> u16 brp, sjw, tseg1, tseg2;
> @@ -1053,7 +1015,7 @@ static int m_can_set_bittiming(struct net_device *dev)
> */
> static void m_can_chip_config(struct net_device *dev)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> u32 cccr, test;
>
> m_can_config_endisable(priv, true);
> @@ -1165,7 +1127,7 @@ static void m_can_chip_config(struct net_device *dev)
>
> static void m_can_start(struct net_device *dev)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
>
> /* basic m_can configuration */
> m_can_chip_config(dev);
> @@ -1194,20 +1156,17 @@ static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
> * else it returns the release and step coded as:
> * return value = 10 * <release> + 1 * <step>
> */
> -static int m_can_check_core_release(void __iomem *m_can_base)
> +static int m_can_check_core_release(struct m_can_classdev *priv)
> {
> u32 crel_reg;
> u8 rel;
> u8 step;
> int res;
> - struct m_can_priv temp_priv = {
> - .base = m_can_base
> - };
>
> /* Read Core Release Version and split into version number
> * Example: Version 3.2.1 => rel = 3; step = 2; substep = 1;
> */
> - crel_reg = m_can_read(&temp_priv, M_CAN_CREL);
> + crel_reg = m_can_read(priv, M_CAN_CREL);
> rel = (u8)((crel_reg & CREL_REL_MASK) >> CREL_REL_SHIFT);
> step = (u8)((crel_reg & CREL_STEP_MASK) >> CREL_STEP_SHIFT);
>
> @@ -1225,18 +1184,22 @@ static int m_can_check_core_release(void __iomem *m_can_base)
> /* Selectable Non ISO support only in version 3.2.x
> * This function checks if the bit is writable.
> */
> -static bool m_can_niso_supported(const struct m_can_priv *priv)
> +static bool m_can_niso_supported(struct m_can_classdev *priv)
> {
> - u32 cccr_reg, cccr_poll;
> - int niso_timeout;
> + u32 cccr_reg, cccr_poll = 0;
> + int niso_timeout = -ETIMEDOUT;
> + int i;
>
> m_can_config_endisable(priv, true);
> cccr_reg = m_can_read(priv, M_CAN_CCCR);
> cccr_reg |= CCCR_NISO;
> m_can_write(priv, M_CAN_CCCR, cccr_reg);
>
> - niso_timeout = readl_poll_timeout((priv->base + M_CAN_CCCR), cccr_poll,
> - (cccr_poll == cccr_reg), 0, 10);
> + for (i = 0; i <= 10; i++) {
> + cccr_poll = m_can_read(priv, M_CAN_CCCR);
> + if (cccr_poll == cccr_reg)
> + niso_timeout = 0;
> + }

This change is also unrelated. Should be done in an extra patch.

> /* Clear NISO */
> cccr_reg &= ~(CCCR_NISO);
> @@ -1248,112 +1211,100 @@ static bool m_can_niso_supported(const struct m_can_priv *priv)
> return !niso_timeout;
> }
>
> -static int m_can_dev_setup(struct platform_device *pdev, struct net_device *dev,
> - void __iomem *addr)
> +static int m_can_dev_setup(struct m_can_classdev *m_can_dev)
> {
> - struct m_can_priv *priv;
> + struct net_device *dev = m_can_dev->net;
> int m_can_version;
>
> - m_can_version = m_can_check_core_release(addr);
> + m_can_version = m_can_check_core_release(m_can_dev);
> /* return if unsupported version */
> if (!m_can_version) {
> - dev_err(&pdev->dev, "Unsupported version number: %2d",
> + dev_err(m_can_dev->dev, "Unsupported version number: %2d",
> m_can_version);
> return -EINVAL;
> }
>
> - priv = netdev_priv(dev);
> - netif_napi_add(dev, &priv->napi, m_can_poll, M_CAN_NAPI_WEIGHT);
> + if (!m_can_dev->is_peripherial)
> + netif_napi_add(dev, &m_can_dev->napi,
> + m_can_poll, M_CAN_NAPI_WEIGHT);
>
> /* Shared properties of all M_CAN versions */
> - priv->version = m_can_version;
> - priv->dev = dev;
> - priv->base = addr;
> - priv->can.do_set_mode = m_can_set_mode;
> - priv->can.do_get_berr_counter = m_can_get_berr_counter;
> + m_can_dev->version = m_can_version;
> + m_can_dev->can.do_set_mode = m_can_set_mode;
> + m_can_dev->can.do_get_berr_counter = m_can_get_berr_counter;
>
> /* Set M_CAN supported operations */
> - priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
> + m_can_dev->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
> CAN_CTRLMODE_LISTENONLY |
> CAN_CTRLMODE_BERR_REPORTING |
> CAN_CTRLMODE_FD;
>
> /* Set properties depending on M_CAN version */
> - switch (priv->version) {
> + switch (m_can_dev->version) {
> case 30:
> /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.0.x */
> can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
> - priv->can.bittiming_const = &m_can_bittiming_const_30X;
> - priv->can.data_bittiming_const =
> + if (m_can_dev->bit_timing)
> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing;
> + else
> + m_can_dev->can.bittiming_const =
> + &m_can_bittiming_const_30X;
> + if (m_can_dev->data_timing)
> + m_can_dev->can.data_bittiming_const =
> + m_can_dev->data_timing;
> + else
> + m_can_dev->can.data_bittiming_const =
> &m_can_data_bittiming_const_30X;

Should'nt that go to m_can_platform.c?

> break;
> case 31:
> /* CAN_CTRLMODE_FD_NON_ISO is fixed with M_CAN IP v3.1.x */
> can_set_static_ctrlmode(dev, CAN_CTRLMODE_FD_NON_ISO);
> - priv->can.bittiming_const = &m_can_bittiming_const_31X;
> - priv->can.data_bittiming_const =
> + if (m_can_dev->bit_timing)
> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing;
> + else
> + m_can_dev->can.bittiming_const =
> + &m_can_bittiming_const_31X;
> + if (m_can_dev->data_timing)
> + m_can_dev->can.data_bittiming_const =
> + m_can_dev->data_timing;
> + else
> + m_can_dev->can.data_bittiming_const =
> &m_can_data_bittiming_const_31X;
> break;
> case 32:
> - priv->can.bittiming_const = &m_can_bittiming_const_31X;
> - priv->can.data_bittiming_const =
> + if (m_can_dev->bit_timing)
> + m_can_dev->can.bittiming_const = m_can_dev->bit_timing;
> + else
> + m_can_dev->can.bittiming_const =
> + &m_can_bittiming_const_31X;
> +
> + if (m_can_dev->data_timing)
> + m_can_dev->can.data_bittiming_const =
> + m_can_dev->data_timing;
> + else
> + m_can_dev->can.data_bittiming_const =
> &m_can_data_bittiming_const_31X;
> - priv->can.ctrlmode_supported |= (m_can_niso_supported(priv)
> +
> + m_can_dev->can.ctrlmode_supported |=
> + (m_can_niso_supported(m_can_dev)
> ? CAN_CTRLMODE_FD_NON_ISO
> : 0);

if (m_can_niso_supported(m_can_dev)
m_can_dev->can.ctrlmode_supported |=
CAN_CTRLMODE_FD_NON_ISO;

> break;
> default:
> - dev_err(&pdev->dev, "Unsupported version number: %2d",
> - priv->version);
> + dev_err(m_can_dev->dev, "Unsupported version number: %2d",
> + m_can_dev->version);
> return -EINVAL;
> }
>
> - return 0;
> -}
> -
> -static int m_can_open(struct net_device *dev)

This function has been moved around making it difficult to understand
the diffs.

> -{
> - struct m_can_priv *priv = netdev_priv(dev);
> - int err;
> -
> - err = m_can_clk_start(priv);
> - if (err)
> - return err;
> -
> - /* open the can device */
> - err = open_candev(dev);
> - if (err) {
> - netdev_err(dev, "failed to open can device\n");
> - goto exit_disable_clks;
> - }
> -
> - /* register interrupt handler */
> - err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
> - dev);
> - if (err < 0) {
> - netdev_err(dev, "failed to request interrupt\n");
> - goto exit_irq_fail;
> - }
> -
> - /* start the m_can controller */
> - m_can_start(dev);
> -
> - can_led_event(dev, CAN_LED_EVENT_OPEN);
> - napi_enable(&priv->napi);
> - netif_start_queue(dev);
> + if (m_can_dev->device_init)
> + m_can_dev->device_init(m_can_dev);
>
> return 0;
> -
> -exit_irq_fail:
> - close_candev(dev);
> -exit_disable_clks:
> - m_can_clk_stop(priv);
> - return err;
> }
>
> static void m_can_stop(struct net_device *dev)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
>
> /* disable all interrupts */
> m_can_disable_all_interrupts(priv);
> @@ -1364,13 +1315,16 @@ static void m_can_stop(struct net_device *dev)
>
> static int m_can_close(struct net_device *dev)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
>
> netif_stop_queue(dev);
> - napi_disable(&priv->napi);
> + if (!priv->is_peripherial)
> + napi_disable(&priv->napi);
> m_can_stop(dev);
> m_can_clk_stop(priv);
> free_irq(dev->irq, dev);
> + destroy_workqueue(priv->wq);

if (priv->is_peripherial) ?

> + priv->wq = NULL;
> close_candev(dev);
> can_led_event(dev, CAN_LED_EVENT_STOP);
>
> @@ -1379,7 +1333,7 @@ static int m_can_close(struct net_device *dev)
>
> static int m_can_next_echo_skb_occupied(struct net_device *dev, int putidx)
> {
> - struct m_can_priv *priv = netdev_priv(dev);
> + struct m_can_classdev *priv = netdev_priv(dev);
> /*get wrap around for loopback skb index */
> unsigned int wrap = priv->can.echo_skb_max;
> int next_idx;
> @@ -1391,18 +1345,17 @@ static int m_can_next_echo_skb_occupied(struct net_device *dev, int putidx)
> return !!priv->can.echo_skb[next_idx];
> }
>
> -static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> - struct net_device *dev)
Ditto

> +static void m_can_tx_work_handler(struct work_struct *ws)

I think you need a common function to do the tx.

> {
> - struct m_can_priv *priv = netdev_priv(dev);
> - struct canfd_frame *cf = (struct canfd_frame *)skb->data;
> + struct m_can_classdev *priv = container_of(ws, struct m_can_classdev,
> + tx_work);
> + struct canfd_frame *cf = (struct canfd_frame *)priv->skb->data;
> + struct net_device *dev = priv->net;
> + struct sk_buff *skb = priv->skb;
> u32 id, cccr, fdflags;
> int i;
> int putidx;
>
> - if (can_dropped_invalid_skb(dev, skb))
> - return NETDEV_TX_OK;
> -
> /* Generate ID field for TX buffer Element */
> /* Common to all supported M_CAN versions */
> if (cf->can_id & CAN_EFF_FLAG) {
> @@ -1431,7 +1384,8 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> can_put_echo_skb(skb, dev, 0);
>
> if (priv->can.ctrlmode & CAN_CTRLMODE_FD) {
> - cccr = m_can_read(priv, M_CAN_CCCR);
> + /*cccr = m_can_read(priv, M_CAN_CCCR);*/
> + cccr = 0;

Unrelated change.

> cccr &= ~(CCCR_CMR_MASK << CCCR_CMR_SHIFT);
> if (can_is_canfd_skb(skb)) {
> if (cf->flags & CANFD_BRS)
> @@ -1457,7 +1411,7 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> netif_stop_queue(dev);
> netdev_warn(dev,
> "TX queue active although FIFO is full.");
> - return NETDEV_TX_BUSY;
> + return;
> }
>
> /* get put index for frame */
> @@ -1498,14 +1452,87 @@ static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> m_can_write(priv, M_CAN_TXBAR, (1 << putidx));
>
> /* stop network queue if fifo full */
> - if (m_can_tx_fifo_full(priv) ||
> - m_can_next_echo_skb_occupied(dev, putidx))
> - netif_stop_queue(dev);
> + if (m_can_tx_fifo_full(priv) ||
> + m_can_next_echo_skb_occupied(dev, putidx))
> + netif_stop_queue(dev);
> }
> +}
> +
> +static netdev_tx_t m_can_start_xmit(struct sk_buff *skb,
> + struct net_device *dev)
> +{
> + struct m_can_classdev *priv = netdev_priv(dev);
> +
> + if (can_dropped_invalid_skb(dev, skb))
> + return NETDEV_TX_BUSY;
> +
> + netif_stop_queue(dev);

if (!priv->is_peripheral) {
m_can_tx(priv, skb);
} else {
netif_stop_queue(dev);
priv->skb = skb;
queue_work(priv->wq, &priv->tx_work);
}

I think stopping the queue here is still experimental.

> return NETDEV_TX_OK;
> }
>
> +static int m_can_open(struct net_device *dev)
> +{
> + struct m_can_classdev *priv = netdev_priv(dev);
> + int err;
> +
> + err = m_can_clk_start(priv);
> + if (err)
> + return err;
> +
> + /* open the can device */
> + err = open_candev(dev);
> + if (err) {
> + netdev_err(dev, "failed to open can device\n");
> + goto exit_disable_clks;
> + }
> +

if (priv->is_peripheral) {

> + priv->wq = alloc_workqueue("mcan_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM,
> + 0);
> + if (!priv->wq) {
> + err = -ENOMEM;
> + goto out_wq_fail;
> + }
> +
> + INIT_WORK(&priv->tx_work, m_can_tx_work_handler);

}

> + /* register interrupt handler */
> + if (priv->is_peripherial)
> + err = request_threaded_irq(dev->irq, NULL, m_can_isr,
> + IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
> + dev->name, dev);
> + else
> + err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
> + dev);
> +
> + if (err < 0) {
> + netdev_err(dev, "failed to request interrupt\n");
> + goto exit_irq_fail;
> + }
> +
> + /* start the m_can controller */
> + m_can_start(dev);
> +
> + can_led_event(dev, CAN_LED_EVENT_OPEN);
> +
> + if (!priv->is_peripherial)
> + napi_enable(&priv->napi);
> +
> + netif_start_queue(dev);
> +
> + return 0;
> +
> +exit_irq_fail:
> + destroy_workqueue(priv->wq);
> +out_wq_fail:
> + close_candev(dev);
> +exit_disable_clks:
> + m_can_clk_stop(priv);
> + return err;
> +}
> +
> static const struct net_device_ops m_can_netdev_ops = {
> .ndo_open = m_can_open,
> .ndo_stop = m_can_close,
> @@ -1521,21 +1548,7 @@ static int register_m_can_dev(struct net_device *dev)
> return register_candev(dev);
> }
>
> -static void m_can_init_ram(struct m_can_priv *priv)
> -{
> - int end, i, start;
> -
> - /* initialize the entire Message RAM in use to avoid possible
> - * ECC/parity checksum errors when reading an uninitialized buffer
> - */
> - start = priv->mcfg[MRAM_SIDF].off;
> - end = priv->mcfg[MRAM_TXB].off +
> - priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
> - for (i = start; i < end; i += 4)
> - writel(0x0, priv->mram_base + i);
> -}
> -
> -static void m_can_of_parse_mram(struct m_can_priv *priv,
> +static void m_can_of_parse_mram(struct m_can_classdev *priv,
> const u32 *mram_config_vals)
> {
> priv->mcfg[MRAM_SIDF].off = mram_config_vals[0];
> @@ -1562,9 +1575,8 @@ static void m_can_of_parse_mram(struct m_can_priv *priv,
> priv->mcfg[MRAM_TXB].num = mram_config_vals[7] &
> (TXBC_NDTB_MASK >> TXBC_NDTB_SHIFT);
>
> - dev_dbg(priv->device,
> - "mram_base %p sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
> - priv->mram_base,
> + dev_dbg(priv->dev,
> + "sidf 0x%x %d xidf 0x%x %d rxf0 0x%x %d rxf1 0x%x %d rxb 0x%x %d txe 0x%x %d txb 0x%x %d\n",
> priv->mcfg[MRAM_SIDF].off, priv->mcfg[MRAM_SIDF].num,
> priv->mcfg[MRAM_XIDF].off, priv->mcfg[MRAM_XIDF].num,
> priv->mcfg[MRAM_RXF0].off, priv->mcfg[MRAM_RXF0].num,
> @@ -1572,63 +1584,55 @@ static void m_can_of_parse_mram(struct m_can_priv *priv,
> priv->mcfg[MRAM_RXB].off, priv->mcfg[MRAM_RXB].num,
> priv->mcfg[MRAM_TXE].off, priv->mcfg[MRAM_TXE].num,
> priv->mcfg[MRAM_TXB].off, priv->mcfg[MRAM_TXB].num);
> -
> - m_can_init_ram(priv);
> }
>
> -static int m_can_plat_probe(struct platform_device *pdev)
> +void m_can_init_ram(struct m_can_classdev *priv)
> {
> - struct net_device *dev;
> - struct m_can_priv *priv;
> - struct resource *res;
> - void __iomem *addr;
> - void __iomem *mram_addr;
> - struct clk *hclk, *cclk;
> - int irq, ret;
> - struct device_node *np;
> - u32 mram_config_vals[MRAM_CFG_LEN];
> - u32 tx_fifo_size;
> -
> - np = pdev->dev.of_node;
> + int end, i, start;
>
> - hclk = devm_clk_get(&pdev->dev, "hclk");
> - cclk = devm_clk_get(&pdev->dev, "cclk");
> + /* initialize the entire Message RAM in use to avoid possible
> + * ECC/parity checksum errors when reading an uninitialized buffer
> + */
> + start = priv->mcfg[MRAM_SIDF].off;
> + end = priv->mcfg[MRAM_TXB].off +
> + priv->mcfg[MRAM_TXB].num * TXB_ELEMENT_SIZE;
>
> - if (IS_ERR(hclk) || IS_ERR(cclk)) {
> - dev_err(&pdev->dev, "no clock found\n");
> - ret = -ENODEV;
> - goto failed_ret;
> - }
> + for (i = start; i < end; i += 4)
> + m_can_fifo_write_no_off(priv, i, 0x0);
> +}
> +EXPORT_SYMBOL_GPL(m_can_init_ram);
>
> - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "m_can");
> - addr = devm_ioremap_resource(&pdev->dev, res);
> - irq = platform_get_irq_byname(pdev, "int0");
> +int m_can_core_get_clocks(struct m_can_classdev *m_can_dev)
> +{
> + int ret = 0;
>
> - if (IS_ERR(addr) || irq < 0) {
> - ret = -EINVAL;
> - goto failed_ret;
> - }
> + m_can_dev->hclk = devm_clk_get(m_can_dev->dev, "hclk");
> + m_can_dev->cclk = devm_clk_get(m_can_dev->dev, "cclk");
>
> - /* message ram could be shared */
> - res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
> - if (!res) {
> + if (IS_ERR(m_can_dev->cclk)) {
> + dev_err(m_can_dev->dev, "no clock found\n");
> ret = -ENODEV;
> - goto failed_ret;
> }
>
> - mram_addr = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> - if (!mram_addr) {
> - ret = -ENOMEM;
> - goto failed_ret;
> - }
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(m_can_core_get_clocks);
>
> - /* get message ram configuration */
> - ret = of_property_read_u32_array(np, "bosch,mram-cfg",
> - mram_config_vals,
> - sizeof(mram_config_vals) / 4);
> +struct m_can_classdev *m_can_core_allocate_dev(struct device *dev)
> +{
> + struct m_can_classdev *class_dev = NULL;
> + u32 mram_config_vals[MRAM_CFG_LEN];
> + struct net_device *net_dev;
> + u32 tx_fifo_size;
> + int ret;
> +
> + ret = fwnode_property_read_u32_array(dev_fwnode(dev),
> + "bosch,mram-cfg",
> + mram_config_vals,
> + sizeof(mram_config_vals) / 4);
> if (ret) {
> - dev_err(&pdev->dev, "Could not get Message RAM configuration.");
> - goto failed_ret;
> + dev_err(dev, "Could not get Message RAM configuration.");
> + goto out;
> }
>
> /* Get TX FIFO size
> @@ -1637,69 +1641,77 @@ static int m_can_plat_probe(struct platform_device *pdev)
> tx_fifo_size = mram_config_vals[7];
>
> /* allocate the m_can device */
> - dev = alloc_candev(sizeof(*priv), tx_fifo_size);
> - if (!dev) {
> - ret = -ENOMEM;
> - goto failed_ret;
> + net_dev = alloc_candev(sizeof(*class_dev), tx_fifo_size);
> + if (!net_dev) {
> + dev_err(dev, "Failed to allocate CAN device");

No error message in case of ENOMEM. It makes it worse. Also, it's an
unrelated change.

> + goto out;
> }
>
> - priv = netdev_priv(dev);
> - dev->irq = irq;
> - priv->device = &pdev->dev;
> - priv->hclk = hclk;
> - priv->cclk = cclk;
> - priv->can.clock.freq = clk_get_rate(cclk);
> - priv->mram_base = mram_addr;
> + class_dev = netdev_priv(net_dev);
> + if (!class_dev) {
> + dev_err(dev, "Failed to init netdev private");
> + goto out;
> + }

WARN_ON_ONECE() ?

>
> - platform_set_drvdata(pdev, dev);
> - SET_NETDEV_DEV(dev, &pdev->dev);
> + class_dev->net = net_dev;
> + class_dev->dev = dev;
> + SET_NETDEV_DEV(net_dev, dev);
>
> - /* Enable clocks. Necessary to read Core Release in order to determine
> - * M_CAN version
> - */
> - pm_runtime_enable(&pdev->dev);
> - ret = m_can_clk_start(priv);
> - if (ret)
> - goto pm_runtime_fail;
> + m_can_of_parse_mram(class_dev, mram_config_vals);
> +out:
> + return class_dev;
> +}
> +EXPORT_SYMBOL_GPL(m_can_core_allocate_dev);
> +
> +int m_can_core_register(struct m_can_classdev *m_can_dev)
> +{
> + int ret;
> +
> + if (m_can_dev->pm_clock_support) {
> + pm_runtime_enable(m_can_dev->dev);
> + ret = m_can_clk_start(m_can_dev);
> + if (ret)
> + goto pm_runtime_fail;
> + }
>
> - ret = m_can_dev_setup(pdev, dev, addr);
> + ret = m_can_dev_setup(m_can_dev);
> if (ret)
> goto clk_disable;
>
> - ret = register_m_can_dev(dev);
> + ret = register_m_can_dev(m_can_dev->net);
> if (ret) {
> - dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
> - KBUILD_MODNAME, ret);
> + dev_err(m_can_dev->dev, "registering %s failed (err=%d)\n",
> + m_can_dev->net->name, ret);
> goto clk_disable;
> }
>
> - m_can_of_parse_mram(priv, mram_config_vals);
> -
> - devm_can_led_init(dev);
> + devm_can_led_init(m_can_dev->net);
>
> - of_can_transceiver(dev);
> + of_can_transceiver(m_can_dev->net);
>
> - dev_info(&pdev->dev, "%s device registered (irq=%d, version=%d)\n",
> - KBUILD_MODNAME, dev->irq, priv->version);
> + dev_info(m_can_dev->dev, "%s device registered (irq=%d, version=%d)\n",
> + KBUILD_MODNAME, m_can_dev->net->irq, m_can_dev->version);
>
> /* Probe finished
> * Stop clocks. They will be reactivated once the M_CAN device is opened
> */
> clk_disable:
> - m_can_clk_stop(priv);
> + m_can_clk_stop(m_can_dev);
> pm_runtime_fail:
> if (ret) {
> - pm_runtime_disable(&pdev->dev);
> - free_candev(dev);
> + if (m_can_dev->pm_clock_support)
> + pm_runtime_disable(m_can_dev->dev);
> + free_candev(m_can_dev->net);
> }
> -failed_ret:
> +
> return ret;
> }
> +EXPORT_SYMBOL_GPL(m_can_core_register);
>
> -static __maybe_unused int m_can_suspend(struct device *dev)
> +int m_can_core_suspend(struct device *dev)
> {
> struct net_device *ndev = dev_get_drvdata(dev);
> - struct m_can_priv *priv = netdev_priv(ndev);
> + struct m_can_classdev *priv = netdev_priv(ndev);
>
> if (netif_running(ndev)) {
> netif_stop_queue(ndev);
> @@ -1714,11 +1726,12 @@ static __maybe_unused int m_can_suspend(struct device *dev)
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(m_can_core_suspend);
>
> -static __maybe_unused int m_can_resume(struct device *dev)
> +int m_can_core_resume(struct device *dev)
> {
> struct net_device *ndev = dev_get_drvdata(dev);
> - struct m_can_priv *priv = netdev_priv(ndev);
> + struct m_can_classdev *priv = netdev_priv(ndev);
>
> pinctrl_pm_select_default_state(dev);
>
> @@ -1739,78 +1752,17 @@ static __maybe_unused int m_can_resume(struct device *dev)
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(m_can_core_resume);
>
> -static void unregister_m_can_dev(struct net_device *dev)
> -{
> - unregister_candev(dev);
> -}
> -
> -static int m_can_plat_remove(struct platform_device *pdev)
> -{
> - struct net_device *dev = platform_get_drvdata(pdev);
> -
> - unregister_m_can_dev(dev);
> -
> - pm_runtime_disable(&pdev->dev);
> -
> - platform_set_drvdata(pdev, NULL);
> -
> - free_candev(dev);
> -
> - return 0;
> -}
> -
> -static int __maybe_unused m_can_runtime_suspend(struct device *dev)
> +void m_can_core_unregister(struct m_can_classdev *m_can_dev)
> {
> - struct net_device *ndev = dev_get_drvdata(dev);
> - struct m_can_priv *priv = netdev_priv(ndev);
> + unregister_candev(m_can_dev->net);
>
> - clk_disable_unprepare(priv->cclk);
> - clk_disable_unprepare(priv->hclk);
> + m_can_clk_stop(m_can_dev);
>
> - return 0;
> + free_candev(m_can_dev->net);
> }
> -
> -static int __maybe_unused m_can_runtime_resume(struct device *dev)
> -{
> - struct net_device *ndev = dev_get_drvdata(dev);
> - struct m_can_priv *priv = netdev_priv(ndev);
> - int err;
> -
> - err = clk_prepare_enable(priv->hclk);
> - if (err)
> - return err;
> -
> - err = clk_prepare_enable(priv->cclk);
> - if (err)
> - clk_disable_unprepare(priv->hclk);
> -
> - return err;
> -}
> -
> -static const struct dev_pm_ops m_can_pmops = {
> - SET_RUNTIME_PM_OPS(m_can_runtime_suspend,
> - m_can_runtime_resume, NULL)
> - SET_SYSTEM_SLEEP_PM_OPS(m_can_suspend, m_can_resume)
> -};
> -
> -static const struct of_device_id m_can_of_table[] = {
> - { .compatible = "bosch,m_can", .data = NULL },
> - { /* sentinel */ },
> -};
> -MODULE_DEVICE_TABLE(of, m_can_of_table);
> -
> -static struct platform_driver m_can_plat_driver = {
> - .driver = {
> - .name = KBUILD_MODNAME,
> - .of_match_table = m_can_of_table,
> - .pm = &m_can_pmops,
> - },
> - .probe = m_can_plat_probe,
> - .remove = m_can_plat_remove,
> -};
> -
> -module_platform_driver(m_can_plat_driver);
> +EXPORT_SYMBOL_GPL(m_can_core_unregister);
>
> MODULE_AUTHOR("Dong Aisheng <b29396@freescale.com>");
> MODULE_LICENSE("GPL v2");
> diff --git a/drivers/net/can/m_can/m_can_platform.h b/drivers/net/can/m_can/m_can_platform.h
> index 97e90dd79613..c3dd301756ba 100644
> --- a/drivers/net/can/m_can/m_can_platform.h
> +++ b/drivers/net/can/m_can/m_can_platform.h
> @@ -156,7 +156,7 @@ int m_can_core_register(struct m_can_classdev *m_can_dev);
> void m_can_core_unregister(struct m_can_classdev *m_can_dev);
> int m_can_core_get_clocks(struct m_can_classdev *m_can_dev);
> void m_can_init_ram(struct m_can_classdev *priv);
> -void m_can_config_endisable(const struct m_can_classdev *priv, bool enable);
> +void m_can_config_endisable(struct m_can_classdev *priv, bool enable);
>
> int m_can_core_suspend(struct device *dev);
> int m_can_core_resume(struct device *dev);

If you fix the issues with "is_peripheral" and the TX function, it
should already work on standard M_CAN devices as before... at least in
theory!

Wolfgang.