linux-kernel - [PATCH 0/5] PCI: mt7621: remove specific MIPS code from driver

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Date:   Mon, 15 Nov 2021 08:08:04 +0100
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     linux-pci@...r.kernel.org
Cc:     linux-mips@...r.kernel.org, tsbogend@...ha.franken.de,
        john@...ozen.org, lorenzo.pieralisi@....com, bhelgaas@...gle.com,
        arnd@...db.de, linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] PCI: mt7621: remove specific MIPS code from driver

Hi all,

MIPS specific code can be removed from driver and put into ralink mt7621
instead which is a more accurate place to do this. To make this possible
we need to have access to 'bridge->windows' in 'pcibios_root_bridge_prepare()'
which has been implemented for ralink mt7621 platform (there is no real 
need to implement this for any other platforms since those ones haven't got
I/O coherency units). This also allow us to properly enable this driver to
completely be enabled for COMPILE_TEST. This patchset appoarch:
- Move windows list splice in 'pci_register_host_bridge()' after function 
  'pcibios_root_bridge_prepare()' is called.
- Implement 'pcibios_root_bridge_prepare()' for ralink mt7621.
- Avoid custom MIPs code in pcie-mt7621 driver.
- Add missing 'MODULE_LICENSE()' to pcie-mt7621 driver to avoid compile test 
  module compilation to complain (already sent patch from Yanteng Si that
  I have rewrite commit message and long description a bit.
- Remove MIPS conditional code from Kconfig.

This patchset also fix some errors reported by Kernel Test Robot about
implicit mips functions used in driver code and fix errors in driver when
is compiled as a module [1] (mips:allmodconfig).

There was an ongoing discussion about this here [0] but I preferred to send
my proposal for better review and understanding:

[0]: https://lore.kernel.org/linux-mips/CAMhs-H8ShoaYiFOOzJaGC68nZz=V365RXN_Kjuj=fPFENGJiiw@mail.gmail.com/T/#t
[1]: https://lkml.org/lkml/2021/11/14/436

Thanks in advance for your time.

Best regards,
   Sergio Paracuellos

Sergio Paracuellos (5):
  PCI: let 'pcibios_root_bridge_prepare()' access to 'bridge->windows'
  MIPS: ralink: implement 'pcibios_root_bridge_prepare()'
  PCI: mt7621: avoid custom MIPS code in driver code
  PCI: mt7621: Add missing 'MODULE_LICENSE()' definition
  PCI: mt7621: Kconfig: completely enable driver for 'COMPILE_TEST'

 arch/mips/ralink/mt7621.c            | 30 +++++++++++++++++++++
 drivers/pci/controller/Kconfig       |  2 +-
 drivers/pci/controller/pcie-mt7621.c | 39 ++--------------------------
 drivers/pci/probe.c                  |  4 +--
 4 files changed, 35 insertions(+), 40 deletions(-)

-- 
2.33.0