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[v4,0/3] Enable ACPI-defined peripherals on i2c-piix4 SMBus

Message ID cover.1517285239.git.andrew.cooks@opengear.com
Headers show
Series Enable ACPI-defined peripherals on i2c-piix4 SMBus | expand

Message

Andrew Cooks Jan. 30, 2018, 9:40 p.m. UTC 
These patches fix a couple of issues with the i2c-piix4 driver on
AMD Family 16h Model 30h SoCs and add ACPI-based enumeration to the
i2c-piix4 driver.

Some I2C peripherals, eg. PCA953x IO expander, are not discovered by the
probe or detect mechanisms when attached to an SMBus controller that uses
the i2c-piix4 SMBus driver.

ACPI provides a mechanism to define these peripherals and the controller
port that they're attached to.

Changes:
v4:
  remove unnecessary SB800_MAIN_PORTS constant
  reduce piix4_remove change
v3:
  take chip revision into account when determining port selection register
v2:
  count the adapters, instead of misusing port numbers

Andrew Cooks (3):
  i2c: piix4: Fix port selection for AMD Family 16h Model 30h
  i2c: piix4: fix probing of reserved ports on AMD
  i2c: piix4: add ACPI support

 drivers/i2c/busses/i2c-piix4.c | 37 ++++++++++++++++++++++++++-----------
 1 file changed, 26 insertions(+), 11 deletions(-)