Am Mon, 31 Jan 2022 17:13:38 +0200
schrieb Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>:
> 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 consolidate p2sb handling code for existing
> users and provide a generic way for new comer(s).
>
> 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.
>
> 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.
Just actually read all this the first time, sorry for that! Will take
care of testing on a few of those Simatic IPCs and write patches to
switch to P2SB ... possibly pinctrl where that might pop up without
ACPI.
I guess p5 will make pinctrl show up on what i would call a 127E ...
apollo lake.
> I hope to have it merged to v5.18-rc1 that
> Siemens can develop their changes based on this series.
Will do.
Sorry for the delay after having passed you i now seem to slow you down.
Henning
> 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).
>
> *) One in this series, and one is a due after merge in the Simatic
> IPC drivers
>
> The series may be routed either via MFD (and I guess Lee would prefer
> that) or via PDx86, whichever seems better for you, folks. As of
> today patches are ACKed by the respective maintainers, but I2C one
> and one of the MFD.
>
> Wolfram, can you ACK the patch against i2c-i801 driver, if you have no
> objections?
>
> Changes in v4:
> - added tag to the entire series (Hans)
> - added tag to pin control patch (Mika)
> - dropped PCI core changes (PCI core doesn't want modifications to be
> made)
> - as a consequence of the above merged necessary bits into p2sb.c
> - added a check that p2sb is really hidden (Hans)
> - added EDAC patches (reviewed by maintainer internally)
>
> 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):
> 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
> EDAC, pnd2: Use proper I/O accessors and address space annotation
> EDAC, pnd2: 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/edac/Kconfig | 1 +
> drivers/edac/pnd2_edac.c | 62 ++---
> drivers/i2c/busses/Kconfig | 1 +
> drivers/i2c/busses/i2c-i801.c | 39 +---
> drivers/mfd/Kconfig | 1 +
> drivers/mfd/lpc_ich.c | 136 +++++++++--
> drivers/pinctrl/intel/pinctrl-intel.c | 14 +-
> drivers/platform/x86/intel/Kconfig | 12 +
> drivers/platform/x86/intel/Makefile | 1 +
> drivers/platform/x86/intel/p2sb.c | 305
> +++++++++++++++++++++++++ include/linux/platform_data/x86/p2sb.h |
> 27 +++ 11 files changed, 500 insertions(+), 99 deletions(-)
> create mode 100644 drivers/platform/x86/intel/p2sb.c
> create mode 100644 include/linux/platform_data/x86/p2sb.h
>
