From: Lee Jones lee.jones@linaro.org
[ Upstream commit 6b5c350648b857047b47acf74a57087ad27d6183 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mfd/mfd-core.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index 215bb5eeb5acf..85f4e55823717 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -177,6 +177,11 @@ 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;