Re: [RESEND PATCH v7 0/5] can: bxcan: add support for ST bxCAN controller

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Hi Dario,


On 3/21/23 12:25, Dario Binacchi wrote:
A gentle ping to remind you of this series.
I have no idea why it hasn't deserved any response for quite some
time.
Is there anything I am still missing?

Please let me know.

I'm just waiting driver (+dt-binding) merge. I prefer that dt-bindings and driver patches are merged first (to avoid yaml issue with DT pacthes). To be honest, I have not checked the status about those patches.


Cheers
Alex



Thanks and regards,

Dario


On Wed, Mar 15, 2023 at 10:10 PM Dario Binacchi
<dario.binacchi@xxxxxxxxxxxxxxxxxxxx> wrote:

The series adds support for the basic extended CAN controller (bxCAN)
found in many low- to middle-end STM32 SoCs.

The driver design (one core module and one driver module) was inspired
by other ST drivers (e. g. drivers/iio/adc/stm32-adc.c,
drivers/iio/adc/stm32-adc-core.c) where device instances share resources.
The shared resources functions are implemented in the core module, the
device driver in a separate module.

The driver has been tested on the stm32f469i-discovery board with a
kernel version 5.19.0-rc2 in loopback + silent mode:

ip link set can0 type can bitrate 125000 loopback on listen-only on
ip link set up can0
candump can0 -L &
cansend can0 300#AC.AB.AD.AE.75.49.AD.D1

For uboot and kernel compilation, as well as for rootfs creation I used
buildroot:

make stm32f469_disco_sd_defconfig
make

but I had to patch can-utils and busybox as can-utils and iproute are
not compiled for MMU-less microcotrollers. In the case of can-utils,
replacing the calls to fork() with vfork(), I was able to compile the
package with working candump and cansend applications, while in the
case of iproute, I ran into more than one problem and finally I decided
to extend busybox's ip link command for CAN-type devices. I'm still
wondering if it was really necessary, but this way I was able to test
the driver.

Changes in v7:
- Add Vincent Mailhol's Reviewed-by tag.
- Remove all unused macros for reading/writing the controller registers.
- Add CAN_ERR_CNT flag to notify availability of error counter.
- Move the "break" before the newline in the switch/case statements.
- Print the mnemotechnic instead of the error value in each netdev_err().
- Remove the debug print for timings parameter.
- Do not copy the data if CAN_RTR_FLAG is set in bxcan_start_xmit().
- Populate ndev->ethtool_ops with the default timestamp info.

Changes in v6:
- move can1 node before gcan to keep ordering by address.

Changes in v5:
- Add Rob Herring's Acked-by tag.
- Add Rob Herring's Reviewed-by tag.
- Put static in front of bxcan_enable_filters() definition.

Changes in v4:
- Remove "st,stm32f4-bxcan-core" compatible. In this way the can nodes
  (compatible "st,stm32f4-bxcan") are no longer children of a parent
   node with compatible "st,stm32f4-bxcan-core".
- Add the "st,gcan" property (global can memory) to can nodes which
   references a "syscon" node containing the shared clock and memory
   addresses.
- Replace the node can@40006400 (compatible "st,stm32f4-bxcan-core")
   with the gcan@40006600 node ("sysnode" compatible). The gcan node
   contains clocks and memory addresses shared by the two can nodes
   of which it's no longer the parent.
- Add to can nodes the "st,gcan" property (global can memory) which
   references the gcan@40006600 node ("sysnode compatibble).
- Add "dt-bindings: arm: stm32: add compatible for syscon gcan node" patch.
- Drop the core driver. Thus bxcan-drv.c has been renamed to bxcan.c and
   moved to the drivers/net/can folder. The drivers/net/can/bxcan directory
   has therefore been removed.
- Use the regmap_*() functions to access the shared memory registers.
- Use spinlock to protect bxcan_rmw().
- Use 1 space, instead of tabs, in the macros definition.
- Drop clock ref-counting.
- Drop unused code.
- Drop the _SHIFT macros and use FIELD_GET()/FIELD_PREP() directly.
- Add BXCAN_ prefix to lec error codes.
- Add the macro BXCAN_RX_MB_NUM.
- Enable time triggered mode and use can_rx_offload().
- Use readx_poll_timeout() in function with timeouts.
- Loop from tail to head in bxcan_tx_isr().
- Check bits of tsr register instead of pkts variable in bxcan_tx_isr().
- Don't return from bxcan_handle_state_change() if skb/cf are NULL.
- Enable/disable the generation of the bus error interrupt depending
   on can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING.
- Don't return from bxcan_handle_bus_err() if skb is NULL.
- Drop statistics updating from bxcan_handle_bus_err().
- Add an empty line in front of 'return IRQ_HANDLED;'
- Rename bxcan_start() to bxcan_chip_start().
- Rename bxcan_stop() to bxcan_chip_stop().
- Disable all IRQs in bxcan_chip_stop().
- Rename bxcan_close() to bxcan_ndo_stop().
- Use writel instead of bxcan_rmw() to update the dlc register.

Changes in v3:
- Remove 'Dario Binacchi <dariobin@xxxxxxxxx>' SOB.
- Add description to the parent of the two child nodes.
- Move "patterProperties:" after "properties: in top level before "required".
- Add "clocks" to the "required:" list of the child nodes.
- Remove 'Dario Binacchi <dariobin@xxxxxxxxx>' SOB.
- Add "clocks" to can@0 node.
- Remove 'Dario Binacchi <dariobin@xxxxxxxxx>' SOB.
- Remove a blank line.
- Remove 'Dario Binacchi <dariobin@xxxxxxxxx>' SOB.
- Fix the documentation file path in the MAINTAINERS entry.
- Do not increment the "stats->rx_bytes" if the frame is remote.
- Remove pr_debug() call from bxcan_rmw().

Changes in v2:
- Change the file name into 'st,stm32-bxcan-core.yaml'.
- Rename compatibles:
   - st,stm32-bxcan-core -> st,stm32f4-bxcan-core
   - st,stm32-bxcan -> st,stm32f4-bxcan
- Rename master property to st,can-master.
- Remove the status property from the example.
- Put the node child properties as required.
- Remove a blank line.
- Fix sparse errors.
- Create a MAINTAINERS entry.
- Remove the print of the registers address.
- Remove the volatile keyword from bxcan_rmw().
- Use tx ring algorithm to manage tx mailboxes.
- Use can_{get|put}_echo_skb().
- Update DT properties.

Dario Binacchi (5):
   dt-bindings: arm: stm32: add compatible for syscon gcan node
   dt-bindings: net: can: add STM32 bxcan DT bindings
   ARM: dts: stm32: add CAN support on stm32f429
   ARM: dts: stm32: add pin map for CAN controller on stm32f4
   can: bxcan: add support for ST bxCAN controller

  .../bindings/arm/stm32/st,stm32-syscon.yaml   |    2 +
  .../bindings/net/can/st,stm32-bxcan.yaml      |   83 ++
  MAINTAINERS                                   |    7 +
  arch/arm/boot/dts/stm32f4-pinctrl.dtsi        |   30 +
  arch/arm/boot/dts/stm32f429.dtsi              |   29 +
  drivers/net/can/Kconfig                       |   12 +
  drivers/net/can/Makefile                      |    1 +
  drivers/net/can/bxcan.c                       | 1088 +++++++++++++++++
  8 files changed, 1252 insertions(+)
  create mode 100644 Documentation/devicetree/bindings/net/can/st,stm32-bxcan.yaml
  create mode 100644 drivers/net/can/bxcan.c

--
2.32.0







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