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mfd: max77693: Do not enforce (incorrect) interrupt trigger type

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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@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210602110445.33536-3-krzysztof.kozlowski@canonical.com
This commit is contained in:
Krzysztof Kozlowski 2021-06-02 13:04:44 +02:00 committed by Lee Jones
parent 215e50b086
commit f5f082eb04
2 changed files with 5 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/devicetree/bindings/mfd/max77693.txt
View File

@ -139,7 +139,7 @@ Example:
compatible = "maxim,max77693";
reg = <0x66>;
interrupt-parent = <&gpx1>;
interrupts = <5 2>;
interrupts = <5 IRQ_TYPE_LEVEL_LOW>;
regulators {
esafeout@1 {

12
drivers/mfd/max77693.c
View File

@ -222,8 +222,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
}
ret = regmap_add_irq_chip(max77693->regmap, max77693->irq,
IRQF_ONESHOT | IRQF_SHARED |
IRQF_TRIGGER_FALLING, 0,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77693_led_irq_chip,
&max77693->irq_data_led);
if (ret) {
@ -232,8 +231,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
}
ret = regmap_add_irq_chip(max77693->regmap, max77693->irq,
IRQF_ONESHOT | IRQF_SHARED |
IRQF_TRIGGER_FALLING, 0,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77693_topsys_irq_chip,
&max77693->irq_data_topsys);
if (ret) {
@ -242,8 +240,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
}
ret = regmap_add_irq_chip(max77693->regmap, max77693->irq,
IRQF_ONESHOT | IRQF_SHARED |
IRQF_TRIGGER_FALLING, 0,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77693_charger_irq_chip,
&max77693->irq_data_chg);
if (ret) {
@ -252,8 +249,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
}
ret = regmap_add_irq_chip(max77693->regmap_muic, max77693->irq,
IRQF_ONESHOT | IRQF_SHARED |
IRQF_TRIGGER_FALLING, 0,
IRQF_ONESHOT | IRQF_SHARED, 0,
&max77693_muic_irq_chip,
&max77693->irq_data_muic);
if (ret) {