[M] Change in coreboot[master]: mb/google/rex/var/rex0: add HID over SPI ACPI driver

[Eran Mitrani (Code Review)]

Attention is currently required from: Kapil Porwal, Matt DeVillier, Subrata Banik, Tarun Tuli.

Hello Kapil Porwal, Subrata Banik, Tarun Tuli, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/74885?usp=email

to look at the new patch set (#14).

Change subject: mb/google/rex/var/rex0: add HID over SPI ACPI driver
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mb/google/rex/var/rex0: add HID over SPI ACPI driver

Add driver to support ELAN touchscreen using SPI for rex

* See "HID Over SPI Protocol Specification" section 5.2 - ACPI enum
* https://www.microsoft.com/en-us/download/details.aspx?id=103325

BUG=b:278783755
TEST=Kernel driver is able to communicate with device. Also tested
S0ix, ran 'suspend_stress_test -c 1' - no issues in suspend/resume.

Signed-off-by: Eran Mitrani 
Change-Id: Id51d385ce350cef23da4184b044c74569f4dd3f0
---
A src/mainboard/google/rex/variants/rex0/include/variant/acpi/hid_spi_elan.asl
1 file changed, 152 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/85/74885/14