[PATCH v2 0/2] Add Loongson CAN-FD controller driver

[Binbin Zhou <zhoubinbin@loongson.cn>]

Hi all:

This patchset adds support for the CAN-FD controller found on Loongson
CPUs.

Patch 1 introduces the basic CAN-FD controller driver with support
for classic CAN and CAN FD, including bit timing, error handling,
NAPI-based RX, and multiple TX buffers.

Patch 2 adds optional DMA support for RX path using the Loongson APB
CMC DMA engine, which significantly reduces CPU load under high
receive throughput.

The driver has been tested on Loongson-2K3000 platforms with various
CAN/CAN FD traffic patterns.

Finally, I'd like to thank Binxiong, the original author of this driver,
for his efforts in working on the patch.

Thanks.
Binbin

-------
V2:
Patch (1/2):
 - Put all code into one file;
 - Add COMPILE_TEST Kconfig option;
 - Rewrite Kconfig description;
 - Use `regmap_test_bits()` to simplify bit field checks;
 - Drop odd FIELD_GET() usage;
 - Don't use FIELD_GET() for a single bit;
 - Use an if/else instead of the ternary operator;
 - Use the CAN TDC framework to get the SSP value;
 - Use guard(spinlock)/scoped_guard(spinlock);
 - Use netdev_debug() to be less verboss;
 - Check for memory allocation failure;
 - Add CAN_ERR_CNT flag;
 - Drop unused REG_DATA_xx_yy_W_DATA_yy definition;
 - Add more function comment;

Link to V1:
https://lore.kernel.org/all/cover.1777273055.git.zhoubinbin@loongson.cn/

Binbin Zhou (2):
  can: Add Loongson CAN-FD controller driver
  can: loongson_canfd: Add RXDMA support

 MAINTAINERS                      |    7 +
 drivers/net/can/Kconfig          |   15 +
 drivers/net/can/Makefile         |    1 +
 drivers/net/can/loongson_canfd.c | 1935 ++++++++++++++++++++++++++++++
 4 files changed, 1958 insertions(+)
 create mode 100644 drivers/net/can/loongson_canfd.c


base-commit: f1359c240191e686614847905fc861cbda480b47
-- 
2.52.0