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mfd: mfd-core: Honour Device Tree's request to disable a child-device

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Until now, MFD has assumed all child devices passed to it (via
mfd_cells) are to be registered. It does not take into account
requests from Device Tree and the like to disable child devices
on a per-platform basis.

Well now it does.

Link: https://www.spinics.net/lists/arm-kernel/msg366309.html
Link: https://lkml.org/lkml/2019/8/22/1350

Reported-by: Barry Song <Baohua.Song@csr.com>
Reported-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Lee Jones 2019-11-07 11:19:50 +00:00
parent 49461659bd
commit 6b5c350648
1 changed files with 5 additions and 0 deletions
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5
drivers/mfd/mfd-core.c
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@ -152,6 +152,11 @@ static int mfd_add_device(struct device *parent, int id,
if (parent->of_node && cell->of_compatible) {
for_each_child_of_node(parent->of_node, np) {
if (of_device_is_compatible(np, cell->of_compatible)) {
if (!of_device_is_available(np)) {
/* Ignore disabled devices error free */
ret = 0;
goto fail_alias;
}
pdev->dev.of_node = np;
pdev->dev.fwnode = &np->fwnode;
break;