[S] Change in coreboot[main]: mb/google/nissa/var/riven: Add elan touchscreen support

[David Wu (Code Review)]

Attention is currently required from: Dinesh Gehlot, Eric Lai, Jayvik Desai, Kapil Porwal, Nick Vaccaro, Rishika Raj, Subrata Banik.

Hello Dinesh Gehlot, Eric Lai, Jayvik Desai, Kapil Porwal, Nick Vaccaro, Rishika Raj, Subrata Banik,

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

https://review.coreboot.org/c/coreboot/+/83876?usp=email

to look at the new patch set (#2).

Change subject: mb/google/nissa/var/riven: Add elan touchscreen support
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mb/google/nissa/var/riven: Add elan touchscreen support

This change adds the necessary configuration for the elan touchscreen (ELAN9004) device, connected to I2C bus 16.

It includes settings for:
* HID descriptor
* Device description
* IRQ configuration
* Detection
* Reset, stop and enable GPIOs with their respective delays
* Power resource handling
* HID descriptor register offset

BUG=b:348125053 b:348126380
TEST=emerge-nissa coreboot
     boot with elan TS, make sure elan TS is functional.

Change-Id: I64c5a11dfaacfcca34240375d4dca5c76a60f62e
Signed-off-by: David Wu 
---
M src/mainboard/google/brya/variants/riven/overridetree.cb
1 file changed, 17 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/76/83876/2