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authorNico Huber <nico.huber@secunet.com>2020-06-03 10:20:07 -0700
committerTim Wawrzynczak <twawrzynczak@chromium.org>2020-09-11 17:34:01 +0000
commit8e1ea525d1ea25634db37bf93690e1479a1d748e (patch)
treeddc994a698ad9d28de4d8df7c2fd7b9c3521053e /src/mainboard/google
parentad7c8ffba97b74d70e139b3745ce02ae513d2ef2 (diff)
downloadcoreboot-8e1ea525d1ea25634db37bf93690e1479a1d748e.tar.xz
sconfig: Allow to link devices to other device's drivers
Rarely, the driver of one device needs to know about another device that can be anywhere in the device hierarchy. Current applications boil down to EEPROMs that store information that is consumed by some code (e.g. MAC address). The idea is to give device nodes in the `devicetree.cb` an alias that can later be used to link it to a device driver's `config` structure. The driver has to declare a field of type `struct device *`, e.g. struct some_chip_driver_config { DEVTREE_CONST struct device *needed_eeprom; }; In the devicetree, the referenced device gets an alias, e.g. device i2c 0x50 alias my_eeprom on end The author of the devicetree is free to choose any alias name that is unique in the devicetree. Later, when configuring the driver the alias can be used to link the device with the field of a driver's config: chip some/chip/driver use my_eeprom as needed_eeprom end Override devices can add an alias if it does not exist, but cannot change the alias for a device that already exists. Alias names are checked for conflicts both in the base tree and in the override tree. References are resolved after the tree is parsed so aliases and references do not need to be in a specific order in the tree. Change-Id: I058a319f9b968924fbef9485a96c9e3f900a3ee8 Signed-off-by: Nico Huber <nico.huber@secunet.com> Signed-off-by: Duncan Laurie <dlaurie@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/35456 Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org> Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard/google')
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