linux-kernel - [RFC 18/18] power: supply: max17040: Do not enforce (incorrect) interrupt trigger type

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Date:   Thu, 10 Dec 2020 22:25:34 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-rtc@...r.kernel.org
Cc:     Iskren Chernev <iskren.chernev@...il.com>,
        Matheus Castello <matheus@...tello.eng.br>,
        Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>,
        Angus Ainslie <angus@...ea.ca>,
        Hans de Goede <hdegoede@...hat.com>
Subject: [RFC 18/18] power: supply: max17040: Do not enforce (incorrect) interrupt trigger type

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.

Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

---

This patch should wait till DTS changes are merged, as it relies on
proper Devicetree.
---
 .../devicetree/bindings/power/supply/max17040_battery.txt       | 2 +-
 drivers/power/supply/max17040_battery.c                         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/power/supply/max17040_battery.txt b/Documentation/devicetree/bindings/power/supply/max17040_battery.txt
index c802f664b508..194eb9fe574d 100644
--- a/Documentation/devicetree/bindings/power/supply/max17040_battery.txt
+++ b/Documentation/devicetree/bindings/power/supply/max17040_battery.txt
@@ -39,7 +39,7 @@ Example:
 		reg = <0x36>;
 		maxim,alert-low-soc-level = <10>;
 		interrupt-parent = <&gpio7>;
-		interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
+		interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
 		wakeup-source;
 	};
 
diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c
index d956c67d5155..f737de0470de 100644
--- a/drivers/power/supply/max17040_battery.c
+++ b/drivers/power/supply/max17040_battery.c
@@ -367,7 +367,7 @@ static int max17040_enable_alert_irq(struct max17040_chip *chip)
 
 	flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
 	ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
-					max17040_thread_handler, flags,
+					max17040_thread_handler, IRQF_ONESHOT,
 					chip->battery->desc->name, chip);
 
 	return ret;
-- 
2.25.1