On 12/10/20 11:25 PM, Krzysztof Kozlowski wrote:
 > The Maxim fuel gauge datasheets describe the interrupt line as active
 > low with a requirement of acknowledge from the CPU.  The falling edge
 > interrupt will mostly work but it's not correct.
 >
 > Fixes: 45dfa741df86 ("ARM: dts: qcom: msm8974-lge-nexus5: Add fuel 
gauge")
 > Signed-off-by: Krzysztof Kozlowski [off-list ref]
 > ---
 >  arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts | 2 +-
 >  1 file changed, 1 insertion(+), 1 deletion(-)
 >
 > diff --git a/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts 
b/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
 > index e769f638f205..4c6f54aa9f66 100644
 > --- a/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
 > +++ b/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
 > @@ -575,7 +575,7 @@ fuelgauge: max17048@36 {
 >              maxim,rcomp = /bits/ 8 <0x4d>;
 >
 >              interrupt-parent = <&msmgpio>;
 > -            interrupts = <9 IRQ_TYPE_EDGE_FALLING>;
 > +            interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
 >
 >              pinctrl-names = "default";
 >              pinctrl-0 = <&fuelgauge_pin>;

According to the datasheet for max17048 the ALRT pin is active low, so that
looks good. The reason it was implemented EDGE_FALLING is mostly due to
fragments taken from downstream, and the fact that it worked :)

Acked-by: Iskren Chernev <iskren.chernev@gmail.com>


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