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UPSTREAM: drivers/i2c/generic: Allow mainboards to export reset and enable GPIOs

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Add power management type config option that allows mainboards to
either:
1. Define a power resource that uses the reset and enable gpios to
power on and off the device using _ON and _OFF methods, or
2. Export reset and enable GPIOs in _CRS and _DSD so that the OS can
directly toggle the GPIOs as required.

GPIO type needs to be updated in drivers_i2c_generic_config to use
acpi_gpio type so that it can be used for both the above cases.

BUG=chrome-os-partner:60194
BRANCH=None
TEST=Verified that elan touchscreen works fine on reef using exported
GPIOs.

Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17797
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

Change-Id: I4d76f193f615cfc4520869dedc55505c109042f6
Reviewed-on: https://chromium-review.googlesource.com/422214
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Furquan Shaikh 2016-12-12 09:23:01 -08:00 • committed by chrome-bot
commit 0804758ce9
3 changed files with 74 additions and 20 deletions
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7
src/mainboard/google/reef/variants/baseboard/devicetree.cb
View file

@ -177,10 +177,9 @@ chip soc/intel/apollolake
register "desc" = ""ELAN Touchscreen""
register "irq" = "IRQ_EDGE_LOW(GPIO_21_IRQ)"
register "probed" = "1"
register "reset_gpio" = "GPIO_36"
register "reset_delay_ms" = "20"
register "enable_gpio" = "GPIO_152"
register "enable_delay_ms" = "1"
register "pwr_mgmt_type" = "GPIO_EXPORT"
register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPIO_36)"
register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPIO_152)"
device i2c 10 on end
end
end # - I2C 3