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of/fdt: skip unflattening of disabled nodes

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For static DT usecases, we don't need the disabled nodes and can skip
unflattening. This saves a significant amount of RAM in memory constrained
cases. In one example on STM32F469, the RAM usage goes from 118K to 26K.

There are a few cases in the kernel that modify the status property
dynamically. These all are changes from enabled to disabled, depend on
OF_DYNAMIC or are not FDT based (PDT based).

Tested-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Frank Rowand <frowand.list@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Rob Herring 2017-10-03 11:07:55 -05:00
parent ecc8a96e25
commit 77ea8a68c5
1 changed files with 4 additions and 0 deletions
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4
drivers/of/fdt.c
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@ -396,6 +396,10 @@ static int unflatten_dt_nodes(const void *blob,
if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH))
continue;
if (!IS_ENABLED(CONFIG_OF_KOBJ) &&
!of_fdt_device_is_available(blob, offset))
continue;
if (!populate_node(blob, offset, &mem, nps[depth],
&nps[depth+1], dryrun))
return mem - base;