From: Sebastian Reichel <sebastian.reichel@collabora.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>, Rob Herring <robh+dt@kernel.org>,
Lee Jones <lee.jones@linaro.org>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
Alessandro Zummo <a.zummo@towertech.it>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
linux-samsung-soc@vger.kernel.org, linux-rtc@vger.kernel.org,
Krzysztof Kozlowski <krzk@kernel.org>
Subject: Re: [PATCH v2 6/7] power: supply: max17042: Do not enforce (incorrect) interrupt trigger type
Date: Fri, 4 Jun 2021 12:00:59 +0200 [thread overview]
Message-ID: <20210604100059.sr57dlwkqbbs6e7g@earth.universe> (raw)
In-Reply-To: <20210526172036.183223-7-krzysztof.kozlowski@canonical.com>
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Hi,
On Wed, May 26, 2021 at 01:20:35PM -0400, Krzysztof Kozlowski wrote:
> From: Krzysztof Kozlowski <krzk@kernel.org>
>
> 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 17047/77693 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 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>
>
> ---
>
> Changes since v1:
> 1. None
> ---
Thanks, queued.
-- Sebastian
> drivers/power/supply/max17042_battery.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
> index 1d7326cd8fc6..ce2041b30a06 100644
> --- a/drivers/power/supply/max17042_battery.c
> +++ b/drivers/power/supply/max17042_battery.c
> @@ -1104,7 +1104,7 @@ static int max17042_probe(struct i2c_client *client,
> }
>
> if (client->irq) {
> - unsigned int flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
> + unsigned int flags = IRQF_ONESHOT;
>
> /*
> * On ACPI systems the IRQ may be handled by ACPI-event code,
> --
> 2.27.0
>
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next prev parent reply other threads:[~2021-06-04 10:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-26 17:20 [PATCH v2 0/7] mfd/power/rtc: Do not enforce (incorrect) interrupt trigger type Krzysztof Kozlowski
2021-05-26 17:20 ` [PATCH v2 1/7] mfd: sec-irq: " Krzysztof Kozlowski
2021-05-26 17:20 ` [PATCH v2 2/7] mfd: max77686: " Krzysztof Kozlowski
2021-05-26 22:33 ` Stephen Boyd
2021-05-26 17:20 ` [PATCH v2 3/7] mfd: max77693: " Krzysztof Kozlowski
2021-05-26 17:20 ` [PATCH v2 4/7] mfd: max14577: " Krzysztof Kozlowski
2021-05-26 17:20 ` [PATCH v2 5/7] rtc: max77686: " Krzysztof Kozlowski
2021-05-26 17:20 ` [PATCH v2 6/7] power: supply: max17042: " Krzysztof Kozlowski
2021-06-04 10:00 ` Sebastian Reichel [this message]
2021-05-26 17:20 ` [PATCH v2 7/7] power: supply: max17040: " Krzysztof Kozlowski
2021-06-02 20:06 ` Rob Herring
2021-06-04 10:01 ` Sebastian Reichel
2021-06-01 15:41 ` [PATCH v2 0/7] mfd/power/rtc: " Lee Jones
2021-06-01 16:13 ` Krzysztof Kozlowski
2021-06-20 20:22 ` (subset) " Alexandre Belloni
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