linux-kernel - [PATCH v2 0/2] Introduce Intel Elkhart Lake PSE I/O

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Message-ID: <20251110052728.383339-1-raag.jadav@intel.com>
Date: Mon, 10 Nov 2025 10:56:39 +0530
From: Raag Jadav <raag.jadav@...el.com>
To: hansg@...nel.org,
	ilpo.jarvinen@...ux.intel.com,
	andriy.shevchenko@...ux.intel.com,
	linus.walleij@...aro.org,
	brgl@...ev.pl
Cc: platform-driver-x86@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Raag Jadav <raag.jadav@...el.com>
Subject: [PATCH v2 0/2] Introduce Intel Elkhart Lake PSE I/O

This series adds Intel Elkhart Lake PSE I/O driver which enumerates the
PCI parent device and splits two child I/O devices (GPIO and Timed I/O
which are available as a single PCI function through shared MMIO) to their
respective I/O drivers.

In spirit, it is a continuation of PSE TIO series[1] which received
objection from Greg for abusing platform device and has now been reworked
to use auxiliary device instead.

Currently TIO driver[2] falls under PPS subsystem supporting generator
functionality and will be coming up in a separate follow-up series for
its independent design changes as per below roadmap.

=> Extend TIO driver[2] to support PPS client functionality.
=> Develop a PPS common driver which hooks to both generator and client
   counterparts.
=> Develop an auxiliary glue driver for PPS common driver.

[1] https://lore.kernel.org/r/20250307052231.551737-1-raag.jadav@intel.com
[2] https://lore.kernel.org/r/20250219040618.70962-1-subramanian.mohan@intel.com

v2:
- Consolidate OFFSET and SIZE macros (Andy)
- Make child device objects parent managed (Andy)
- Fix double free on error path (Andy)
- Shorten child device names to fit id string length (Andy)

Raag Jadav (2):
  platform/x86/intel: Introduce Intel Elkhart Lake PSE I/O
  gpio: elkhartlake: Convert to auxiliary driver

 MAINTAINERS                             |   7 ++
 drivers/gpio/Kconfig                    |   2 +-
 drivers/gpio/gpio-elkhartlake.c         |  34 ++++----
 drivers/platform/x86/intel/Kconfig      |  13 +++
 drivers/platform/x86/intel/Makefile     |   1 +
 drivers/platform/x86/intel/ehl_pse_io.c | 107 ++++++++++++++++++++++++
 include/linux/ehl_pse_io_aux.h          |  30 +++++++
 7 files changed, 175 insertions(+), 19 deletions(-)
 create mode 100644 drivers/platform/x86/intel/ehl_pse_io.c
 create mode 100644 include/linux/ehl_pse_io_aux.h

-- 
2.43.0