On Tue, 10 May 2022, Andy Shevchenko wrote:
> There are a few users and at least one more is coming (*1) 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 (*2).
>
> The patch that brings 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 v5 do not change the main idea and the functionality
> in a big scale. What we need is probably one more retest done by Henning
> (*3). I hope to have it merged to v5.19-rc1 that Siemens can develop
> their changes based on this series (*4).
>
> 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).
>
> *1) One in this series, and one is a recent merge of the Simatic IPC drivers
> *2) This patch can be postponed as Lee hasn't given his tag yet.
> *3) Henning gave his tag and I dared to used it even against changed patch 1
> *4) The changes were posted in between of v4 and v5 of this series, but need
> more work.
>
> Taking into account the *2) the series is ready to be merged via PDx86 tree.
If that happens you need to do 2 things:
1. Change all s/Acked-for-MFD-by/Acked-by/
2. Submit a pull-request that we can all pull from
Alternatively, I can apply this via MFD and do the same.
> Changes in v5:
> - rewritten patch 1 to use pci_scan_single_device() (Lukas, Bjorn)
> - rebased patch 2 on top of the new Intel SPI NOR codebase
> - fixed a potential bug and rewritten resource filling in patch 5 (Lee)
> - added many different tags in a few patches (Jean, Wolfram, Henning)
>
> 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 | 161 +++++++++++++++++++------
> 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 | 133 ++++++++++++++++++++
> include/linux/platform_data/x86/p2sb.h | 28 +++++
> 11 files changed, 338 insertions(+), 116 deletions(-)
> create mode 100644 drivers/platform/x86/intel/p2sb.c
> create mode 100644 include/linux/platform_data/x86/p2sb.h
>
>
> base-commit: 3bf222d317a20170ee17f082626c1e0f83537e13
--
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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