[RFC 15/18] mfd: max77693: Do not enforce (incorrect) interrupt trigger type
robh at kernel.org
Mon Dec 21 13:46:12 EST 2020
On Thu, 10 Dec 2020 22:25:31 +0100, Krzysztof Kozlowski wrote:
> Interrupt line can be configured on different hardware in different way,
> even inverted. Therefore driver should not enforce specific trigger
> type - edge falling - but instead rely on Devicetree to configure it.
> The Maxim 77693 datasheet describes the interrupt line as active low
> with a requirement of acknowledge from the CPU therefore the edge
> falling is not correct.
> The interrupt line is shared between PMIC and RTC driver, so using level
> sensitive interrupt is here especially important to avoid races. With
> an edge configuration in case if first PMIC signals interrupt followed
> shortly after by the RTC, the interrupt might not be yet cleared/acked
> thus the second one would not be noticed.
> Signed-off-by: Krzysztof Kozlowski <krzk at kernel.org>
> This patch should wait till DTS changes are merged, as it relies on
> proper Devicetree.
> Documentation/devicetree/bindings/mfd/max77693.txt | 2 +-
> drivers/mfd/max77693.c | 12 ++++--------
> 2 files changed, 5 insertions(+), 9 deletions(-)
Acked-by: Rob Herring <robh at kernel.org>
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