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dm: Support parent devices with of-platdata

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At present of-platdata does not provide parent information. But this is
useful for I2C devices, for example, since it allows them to determine
which bus they are on.

Add support for setting the parent correctly, by storing the parent
driver_info index in dtoc and reading this in lists_bind_drivers(). This
needs multiple passes since we must process children after their parents
already have been bound.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2020-10-03 11:31:35 -06:00
parent 67507e4aab
commit e41651fffd
5 changed files with 116 additions and 3 deletions
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18
dts/Kconfig
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@@ -355,6 +355,15 @@ config SPL_OF_PLATDATA
compatible string, then adding platform data and U_BOOT_DEVICE
declarations for each node. See of-plat.txt for more information.
config SPL_OF_PLATDATA_PARENT
bool "Support parent information in devices"
depends on SPL_OF_PLATDATA
default y
help
Generally it is useful to be able to access the parent of a device
with of-platdata. To save space this can be disabled, but in that
case dev_get_parent() will always return NULL;
config TPL_OF_PLATDATA
bool "Generate platform data for use in TPL"
depends on TPL_OF_CONTROL
@@ -376,4 +385,13 @@ config TPL_OF_PLATDATA
compatible string, then adding platform data and U_BOOT_DEVICE
declarations for each node. See of-plat.txt for more information.
config TPL_OF_PLATDATA_PARENT
bool "Support parent information in devices"
depends on TPL_OF_PLATDATA
default y
help
Generally it is useful to be able to access the parent of a device
with of-platdata. To save space this can be disabled, but in that
case dev_get_parent() will always return NULL;
endmenu