There are a few users and at least one more is coming that would
like to utilize P2SB mechanism of hiding and unhiding a device from
the PCI configuration space.
Here is the series to deduplicate existing users and provide
a generic way for new comers.
It also includes a patch to enable GPIO controllers on Apollo Lake
when it's used with ABL bootloader w/o ACPI support.
The patch that bring the helper ("platform/x86/intel: Add Primary
to Sideband (P2SB) bridge support") has a commit message that
sheds a light on what the P2SB is and why this is needed.
Please, comment on the approach and individual patches.
The changes made in v2 do not change the main idea and the functionality
in a big scale. What we need is probably one more (RE-)test done by Henning.
I hope to have it merged to v5.17-rc1 that Siemens can develop their changes
based on this series.
I have tested this on Apollo Lake platform (I'm able to see SPI NOR and
since we have an ACPI device for GPIO I do not see any attempts to recreate
one).
(Since it's cross subsystem, the PDx86 seems the main one and
I think it makes sense to route it throught it with immutable
tag or branch provided for the others).
Bjorn, are you okay with this approach and the commit message in the main
patch?
Changes in v3:
- resent with cover letter
Changes in v2:
- added parentheses around bus in macros (Joe)
- added tag (Jean)
- fixed indentation and wrapping in the header (Christoph)
- moved out of PCI realm to PDx86 as the best common denominator (Bjorn)
- added a verbose commit message to explain P2SB thingy (Bjorn)
- converted first parameter from pci_dev to pci_bus
- made first two parameters (bus and devfn) optional (Henning, Lee)
- added Intel pin control patch to the series (Henning, Mika)
- fixed English style in the commit message of one of MFD patch (Lee)
- added tags to my MFD LPC ICH patches (Lee)
- used consistently (c) (Lee)
- made indexing for MFD cell and resource arrays (Lee)
- fixed the resource size in i801 (Jean)
Andy Shevchenko (6):
PCI: Introduce pci_bus_*() printing macros when device is not
available
PCI: Convert __pci_read_base() to __pci_bus_read_base()
pinctrl: intel: Check against matching data instead of ACPI companion
mfd: lpc_ich: Factor out lpc_ich_enable_spi_write()
mfd: lpc_ich: Switch to generic p2sb_bar()
i2c: i801: convert to use common P2SB accessor
Jonathan Yong (1):
platform/x86/intel: Add Primary to Sideband (P2SB) bridge support
Tan Jui Nee (1):
mfd: lpc_ich: Add support for pinctrl in non-ACPI system
drivers/i2c/busses/Kconfig | 1 +
drivers/i2c/busses/i2c-i801.c | 39 ++-----
drivers/mfd/Kconfig | 1 +
drivers/mfd/lpc_ich.c | 136 +++++++++++++++++++++----
drivers/pci/pci.h | 16 ++-
drivers/pci/probe.c | 81 +++++++--------
drivers/pinctrl/intel/pinctrl-intel.c | 14 ++-
drivers/platform/x86/intel/Kconfig | 12 +++
drivers/platform/x86/intel/Makefile | 2 +
drivers/platform/x86/intel/p2sb.c | 99 ++++++++++++++++++
include/linux/pci.h | 8 ++
include/linux/platform_data/x86/p2sb.h | 27 +++++
12 files changed, 335 insertions(+), 101 deletions(-)
create mode 100644 drivers/platform/x86/intel/p2sb.c
create mode 100644 include/linux/platform_data/x86/p2sb.h
--
2.34.1
