Merge branch 'net-ravb-prepare-for-suspend-to-ram-and-runtime-pm-support-part-1'

Merge branch 'net-ravb-prepare-for-suspend-to-ram-and-runtime-pm-support-part-1'

Claudiu Beznea says:

====================
net: ravb: Prepare for suspend to RAM and runtime PM support (part 1)

This series prepares ravb driver for runtime PM support and adjust the
already existing suspend to RAM code to work for RZ/G3S (R9A08G045) SoC.

As there are IP versions that switch to module standby when disabling
the clocks, and because of module standby IP switches to reset and
the register content is lost, to be able to have runtime PM supported
for all IP variants, the configuration operations were moved all to
ravb_open()/ravb_close() letting the ravb_probe() and ravb_remove()
to deal with resource parsing and allocation/free.

The ethtool and IOCTL APIs that could have been run asyncronously
were adapted to return if the interface is down. As explained in
each individual commits description, this should be harmless.

Along with it, the series contains preparatory cleanups.

The series has been tested on the boards with the following device trees:
- r8a7742-iwg21d-q7.dts
- r8a774a1-hihope-rzg2m-ex.dts
- r9a07g043u11-smarc-rzg2ul.dts
- r9a07g054l2-smarc-rzv2l.dts
- r9a07g044l2-smarc-rzg2l.dts

Changes in v6:
- fixed typo in patch 08/15
- re-arranged the tags as my b4 am/shazam placed the Rb tags
  before author's Sob tag

Changes in v5:
- collected tags
- fixed typos in patches description
- improved description for patch 07/15
- collected tags

Changes in v4:
- changed cover letter title and keep on 15 patches in series to cope
  with requirement at [1]
- add dependency on RESET_CONTROLLER in patch "net: ravb: Make reset
  controller support mandatory"
- use pm_runtime_active() in patch "net: ravb: Move the IRQs get and
  request in the probe function"
- set config more before reading the mac address in patch "net: ravb: Set
  config mode in ndo_open and reset mode in ndo_close"
- collected tags

[1] https://www.kernel.org/doc/html/v6.6/process/maintainer-netdev.html#tl-dr

Changes in v3:
- collected tags
- addressed review comments
- squashed patch 17/21 ("net: ravb: Keep clock request operations grouped
  together") from v2 in patch 07/19 ("net: ravb: Move reference clock
  enable/disable on runtime PM APIs") from v3
- check for ndev->flags & IFF_UP in patch 17/19 and 18/19 instead of
  checking netif_running()
- dropped patch 19/21 ("net: ravb: Do not set promiscuous mode if the
  interface is down") as the changes there are not necessary as
  ndev->flags & IFF_UP is already checked at the beginning of
  __dev_set_rx_mode()
- remove code from ravb_open() introduced by patch 20/21
  ("net: ravb: Do not apply RX CSUM settings to hardware if the interface
  is down") from v2 as this is not necessary; driver already takes
  care of this in ravb_emac_init_rcar()

Changes in v2:
- rework the driver (mainly, ravb_open() contains now only resource
  allocation and parsing leaving the settings to ravb_open(); ravb_remove()
  has been adapted accordingly) to be able to use runtime PM for all
  IP variants; due to this number of patches increased
- adjust previous series to review comments
- collected tags
- populated driver's own runtime PM ops with enable/disable of reference
  clock
====================

Link: https://lore.kernel.org/r/20240202084136.3426492-1-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>