[PATCH v3 0/5] bcma: support the BCM6362 integrated WLAN backplane

[Alessio Ferri <alessio.ferri@mythread.it>]

The BCM6362 integrates a WLAN macro (802.11n core) on its own 
bcma backplane. The backplane differs from the ones bcma supports 
because: 1) its registers are big-endian, 2) none of its cores has 
a wrapper and make bcma loop crash, and 3) the macro has to be 
clocked, taken out of reset and enabled through a SoC-level WLAN
control block before the backplane can be accessed.

Patches 2 and 3 add two opt-in bus flags to the scan code for the
endianness and for wrapper-less cores. Patch 4 adds a dedicated host
driver that brings the macro up, provides big-endian ops and emulates
the agent registers on top of the WLAN control block. Patches 1 and 5
add the binding and the SoC dtsi node.

My router run with this series backported to kernel 6.12, and has a 
bcm4352 and the integrated wlan targeted by this patch; bcma scans both 
without problems, both chips transmit just fine. The bcm4352 is pcie and
has a normal backplane, so the changes are tested as non-breaking.

This is a small module and i have plenty of hardware to test it (3x 
6362), I am able to maintain it as long as my hardware allows. 
It is also low risk: the flags that change the behaviour of bcma are 
opt-in and it is "complete", at least for the 6362.
Further code is only expected if the bcm63168, that i also have in high 
numbers (5 routers), requires it.

Signed-off-by: Alessio Ferri <alessio.ferri@mythread.it>
---
Changes in v3:
- Restricted interrupt mask
- Link to v2: https://lore.kernel.org/r/20261012-bcm6362-wlan-v2-0-4752da7e0982@mythread.it

Changes in v2:
- Replace the drivers/bus bridge driver and the host_soc platform_data
  quirks with a dedicated bcma host driver, drivers/bcma/host_soc_bcm6362.c;
  host_soc.c is left untouched
- DT: describe the WLAN backplane with a single
  "brcm,bcm6362-wlan-bus-axi" node instead of a bridge node with a
  brcm,bus-axi child; add the node to bcm6362.dtsi
- Drop the "SHIM" naming: reg-names "chipcommon"/"wlan-ctrl",
  reset-names "wlan"/"wlan-ubus", bus flag "wrapperless"
- Split the scan changes into two opt-in bus flags (big_endian,
  wrapperless)
- Move the MAINTAINERS entry to the new driver and binding
- Link to v1: https://lore.kernel.org/r/20260529-add-bcm6362-wlan-v1-0-722242777f58@gmail.com

---
Alessio Ferri (5):
      dt-bindings: bus: add Broadcom BCM6362 WLAN AXI backplane
      bcma: scan: support big-endian backplanes
      bcma: scan: accept wrapper-less cores on wrapper-less backplanes
      bcma: add host driver for the BCM6362 integrated WLAN backplane
      MIPS: dts: bcm6362: add the integrated WLAN backplane

 .../bindings/bus/brcm,bcm6362-wlan-bus-axi.yaml    | 109 ++++++
 MAINTAINERS                                        |   7 +
 arch/mips/boot/dts/brcm/bcm6362.dtsi               |  20 +
 drivers/bcma/Kconfig                               |  12 +
 drivers/bcma/Makefile                              |   1 +
 drivers/bcma/bcma_private.h                        |  15 +
 drivers/bcma/host_soc_bcm6362.c                    | 419 +++++++++++++++++++++
 drivers/bcma/main.c                                |   6 +
 drivers/bcma/scan.c                                |  10 +-
 include/linux/bcma/bcma.h                          |   5 +
 10 files changed, 603 insertions(+), 1 deletion(-)
---
base-commit: d6d3455d8751854e0d1820f14184682e23ac4475
change-id: 20261011-bcm6362-wlan-d4473bd1f2e0

Best regards,
-- 
Alessio Ferri <alessio.ferri@mythread.it>