Attention is currently required from: Maxim Polyakov, Angel Pons.

Maxim Polyakov uploaded patch set #11 to this change.

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ec/kontron/kempld: Add minimal GPIO driver

The patch adds an interface for configuring GPIOs inside the Kontron
CPLD/EC. This allows to statically define the mode for each pad in
devicetree.cb of the motherboard or carrier board. For example:

chip ec/kontron/kempld
device gpio 0 on
register "gpio[0]" = "KEMPLD_GPIO_INPUT"
register "gpio[4]" = "KEMPLD_GPIO_OUTPUT_LOW"
register "gpio[5]" = "KEMPLD_GPIO_OUTPUT_HIGH"
register "gpio[11]" = "KEMPLD_GPIO_DEFAULT"
end
end

In this case, <device gpio 0>, like all other devices, is not a real
device inside the EC. These definitions are used to understand the EC
resources and systematize configuration options, but if mark this as
<off>, the initialization step will be skipped in the driver code.

Use KEMPLD_GPIO_DEFAULT or skip it in devicetree.cb to not configure
the pad and keep the default mode after CPLD reset.

This work is based on code from the drivers/gpio/gpio-kempld.c linux
driver. Tested on Kontron mAL-10 COMe module CB:54380 .

Change-Id: Id767aa451fbf2ca1c0dccfc9aa2c024c6f37c1bb
Signed-off-by: Maxim Polyakov <max.senia.poliak@gmail.com>
---
M src/ec/kontron/kempld/Makefile.inc
M src/ec/kontron/kempld/chip.h
M src/ec/kontron/kempld/kempld.c
A src/ec/kontron/kempld/kempld_gpio.c
M src/ec/kontron/kempld/kempld_internal.h
5 files changed, 95 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/95/47595/11

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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-Change-Id: Id767aa451fbf2ca1c0dccfc9aa2c024c6f37c1bb
Gerrit-Change-Number: 47595
Gerrit-PatchSet: 11
Gerrit-Owner: Maxim Polyakov <max.senia.poliak@gmail.com>
Gerrit-Reviewer: Felix Singer <felixsinger@posteo.net>
Gerrit-Reviewer: Angel Pons <th3fanbus@gmail.com>
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