linux/Documentation/ABI/obsolete/sysfs-driver-intel_pmc_bxt
Mika Westerberg 25f1ca31e2 platform/x86: intel_pmc_ipc: Convert to MFD
This driver only creates a bunch of platform devices sharing resources
belonging to the PMC device. This is pretty much what MFD subsystem is
for so move the driver there, renaming it to intel_pmc_bxt.c which
should be more clear what it is.

MFD subsystem provides nice helper APIs for subdevice creation so
convert the driver to use those. Unfortunately the ACPI device includes
separate resources for most of the subdevices so we cannot simply call
mfd_add_devices() to create all of them but instead we need to call it
separately for each device.

The new MFD driver continues to expose two sysfs attributes that allow
userspace to send IPC commands to the PMC/SCU to avoid breaking any
existing applications that may use these. Generally this is bad idea so
document this in the ABI documentation.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-04-24 11:18:44 +01:00

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These files allow sending arbitrary IPC commands to the PMC/SCU which
may be dangerous. These will be removed eventually and should not be
used in any new applications.
What: /sys/bus/platform/devices/INT34D2:00/simplecmd
Date: Jun 2015
KernelVersion: 4.1
Contact: Mika Westerberg <mika.westerberg@linux.intel.com>
Description: This interface allows userspace to send an arbitrary
IPC command to the PMC/SCU.
Format: %d %d where first number is command and
second number is subcommand.
What: /sys/bus/platform/devices/INT34D2:00/northpeak
Date: Jun 2015
KernelVersion: 4.1
Contact: Mika Westerberg <mika.westerberg@linux.intel.com>
Description: This interface allows userspace to enable and disable
Northpeak through the PMC/SCU.
Format: %u.