[RFC]: can 2020-10-19: m_can/tcan4x5x

this is a RFC series of all m_can/tcan4x5x patches, I have collected for my
next pull request to net/master.

Please test and comment.

regards,
Marc

Follow-Ups:
- [net-rfc 04/12] can: tcan4x5x: tcan4x5x_clear_interrupts(): remove redundant return statement
  - From: Marc Kleine-Budde
- [net-rfc 06/12] can: tcan4x5x: tcan4x5x_can_probe(): add missing error checking for devm_regmap_init()
  - From: Marc Kleine-Budde
- [net-rfc 07/12] can: m_can: m_can_class_free_dev(): introduce new function
  - From: Marc Kleine-Budde
- [net-rfc 09/12] can: m_can: tcan4x5x: tcan4x5x_can_remove(): fix order of deregistration
  - From: Marc Kleine-Budde
- [net-rfc 12/12] can: m_can: Remove unused clock function from the framework
  - From: Marc Kleine-Budde
- [net-rfc 11/12] can: m_can_platform: Move clock discovery and init to platform
  - From: Marc Kleine-Budde
- [net-rfc 10/12] can: tcan4x5x: Move clock init to TCAN driver
  - From: Marc Kleine-Budde
- [net-rfc 08/12] can: m_can: Fix freeing of can device from peripherials
  - From: Marc Kleine-Budde
- [net-rfc 05/12] can: tcan4x5x: Rename parse_config() function
  - From: Marc Kleine-Budde
- [net-rfc 02/12] can: m_can: m_can_handle_state_change(): fix state change
  - From: Marc Kleine-Budde
- [net-rfc 03/12] can: tcan4x5x: replace depends on REGMAP_SPI with depends on SPI
  - From: Marc Kleine-Budde
- [net-rfc 01/12] can: m_can: remove double clearing of clock stop request bit
  - From: Marc Kleine-Budde