[RFC 17/18] mfd: max14577: Do not enforce (incorrect) interrupt trigger type

[Rob Herring]

On Thu, 10 Dec 2020 22:25:33 +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 14577/77836 datasheets describe 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 charger 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/max14577.txt | 4 ++--
>  drivers/mfd/max14577.c                             | 6 +++---
>  2 files changed, 5 insertions(+), 5 deletions(-)
> 

Acked-by: Rob Herring <robh at kernel.org>