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i2c: Add drivers for the AMD PCIe MP2 I2C controller

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MP2 controllers have two separate busses, so may accommodate up to two I2C
adapters. Those adapters are listed in the ACPI namespace with the
"AMDI0011" HID, and probed by a platform driver.

Communication with the MP2 takes place through MMIO registers, or through
DMA for more than 32 bytes transfers.

This is major rework of the patch submitted by Nehal-bakulchandra Shah from
AMD (https://patchwork.kernel.org/patch/10597369/).

Most of the event handling of v3 was rewritten to make it work with more
than one bus (e.g on Ryzen-based Lenovo Yoga 530), and this version
contains many other improvements.

Signed-off-by: Elie Morisse <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
This commit is contained in:
Elie Morisse 2019-03-05 12:13:19 -03:00 • committed by Wolfram Sang
commit 529766e0a0
7 changed files with 1111 additions and 0 deletions
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Documentation/i2c/busses/i2c-amd-mp2 Normal file
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Kernel driver i2c-amd-mp2
Supported adapters:
* AMD MP2 PCIe interface
Datasheet: not publicly available.
Authors:
Shyam Sundar S K <[email protected]>
Nehal Shah <[email protected]>
Elie Morisse <[email protected]>
Description
-----------
The MP2 is an ARM processor programmed as an I2C controller and communicating
with the x86 host through PCI.
If you see something like this:
03:00.7 MP2 I2C controller: Advanced Micro Devices, Inc. [AMD] Device 15e6
in your 'lspci -v', then this driver is for your device.