From: Krzysztof Kozlowski <krzk@kernel.org> To: Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>, 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>, Sebastian Reichel <sre@kernel.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, Andy Gross <agross@kernel.org>, Bjorn Andersson <bjorn.andersson@linaro.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-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-rtc@vger.kernel.org Cc: Iskren Chernev <iskren.chernev@gmail.com>, Matheus Castello <matheus@castello.eng.br>, Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>, Angus Ainslie <angus@akkea.ca>, Hans de Goede <hdegoede@redhat.com> Subject: [RFC 13/18] mfd: max77686: Do not enforce (incorrect) interrupt trigger type Date: Thu, 10 Dec 2020 22:25:29 +0100 [thread overview] Message-ID: <20201210212534.216197-13-krzk@kernel.org> (raw) In-Reply-To: <20201210212534.216197-1-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 77686 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> --- This patch should wait till DTS changes are merged, as it relies on proper Devicetree. --- Documentation/devicetree/bindings/clock/maxim,max77686.txt | 4 ++-- Documentation/devicetree/bindings/mfd/max77686.txt | 2 +- Documentation/devicetree/bindings/regulator/max77686.txt | 2 +- drivers/mfd/max77686.c | 3 +-- 4 files changed, 5 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/maxim,max77686.txt b/Documentation/devicetree/bindings/clock/maxim,max77686.txt index 3472b461ca93..c10849efb444 100644 --- a/Documentation/devicetree/bindings/clock/maxim,max77686.txt +++ b/Documentation/devicetree/bindings/clock/maxim,max77686.txt @@ -49,7 +49,7 @@ Example: max77686: max77686@9 { compatible = "maxim,max77686"; interrupt-parent = <&wakeup_eint>; - interrupts = <26 0>; + interrupts = <26 IRQ_TYPE_LEVEL_LOW>; reg = <0x09>; #clock-cells = <1>; @@ -74,7 +74,7 @@ Example: max77802: max77802@9 { compatible = "maxim,max77802"; interrupt-parent = <&wakeup_eint>; - interrupts = <26 0>; + interrupts = <26 IRQ_TYPE_LEVEL_LOW>; reg = <0x09>; #clock-cells = <1>; diff --git a/Documentation/devicetree/bindings/mfd/max77686.txt b/Documentation/devicetree/bindings/mfd/max77686.txt index 42968b7144e0..4447d074894a 100644 --- a/Documentation/devicetree/bindings/mfd/max77686.txt +++ b/Documentation/devicetree/bindings/mfd/max77686.txt @@ -21,6 +21,6 @@ Example: max77686: pmic@9 { compatible = "maxim,max77686"; interrupt-parent = <&wakeup_eint>; - interrupts = <26 0>; + interrupts = <26 IRQ_TYPE_LEVEL_LOW>; reg = <0x09>; }; diff --git a/Documentation/devicetree/bindings/regulator/max77686.txt b/Documentation/devicetree/bindings/regulator/max77686.txt index e9f7578ca09a..ff3d2dec8c4b 100644 --- a/Documentation/devicetree/bindings/regulator/max77686.txt +++ b/Documentation/devicetree/bindings/regulator/max77686.txt @@ -43,7 +43,7 @@ Example: max77686: pmic@9 { compatible = "maxim,max77686"; interrupt-parent = <&wakeup_eint>; - interrupts = <26 IRQ_TYPE_NONE>; + interrupts = <26 IRQ_TYPE_LEVEL_LOW>; reg = <0x09>; voltage-regulators { diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c index 2ad554b921d9..f9e12ab2bc75 100644 --- a/drivers/mfd/max77686.c +++ b/drivers/mfd/max77686.c @@ -209,8 +209,7 @@ static int max77686_i2c_probe(struct i2c_client *i2c) ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap, max77686->irq, - IRQF_TRIGGER_FALLING | IRQF_ONESHOT | - IRQF_SHARED, 0, irq_chip, + IRQF_ONESHOT | IRQF_SHARED, 0, irq_chip, &max77686->irq_data); if (ret < 0) { dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret); -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Krzysztof Kozlowski <krzk@kernel.org> To: Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>, 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>, Sebastian Reichel <sre@kernel.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, Andy Gross <agross@kernel.org>, Bjorn Andersson <bjorn.andersson@linaro.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-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-rtc@vger.kernel.org Cc: Angus Ainslie <angus@akkea.ca>, Hans de Goede <hdegoede@redhat.com>, Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>, Iskren Chernev <iskren.chernev@gmail.com>, Matheus Castello <matheus@castello.eng.br> Subject: [RFC 13/18] mfd: max77686: Do not enforce (incorrect) interrupt trigger type Date: Thu, 10 Dec 2020 22:25:29 +0100 [thread overview] Message-ID: <20201210212534.216197-13-krzk@kernel.org> (raw) In-Reply-To: <20201210212534.216197-1-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 77686 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> --- This patch should wait till DTS changes are merged, as it relies on proper Devicetree. --- Documentation/devicetree/bindings/clock/maxim,max77686.txt | 4 ++-- Documentation/devicetree/bindings/mfd/max77686.txt | 2 +- Documentation/devicetree/bindings/regulator/max77686.txt | 2 +- drivers/mfd/max77686.c | 3 +-- 4 files changed, 5 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/maxim,max77686.txt b/Documentation/devicetree/bindings/clock/maxim,max77686.txt index 3472b461ca93..c10849efb444 100644 --- a/Documentation/devicetree/bindings/clock/maxim,max77686.txt +++ b/Documentation/devicetree/bindings/clock/maxim,max77686.txt @@ -49,7 +49,7 @@ Example: max77686: max77686@9 { compatible = "maxim,max77686"; interrupt-parent = <&wakeup_eint>; - interrupts = <26 0>; + interrupts = <26 IRQ_TYPE_LEVEL_LOW>; reg = <0x09>; #clock-cells = <1>; @@ -74,7 +74,7 @@ Example: max77802: max77802@9 { compatible = "maxim,max77802"; interrupt-parent = <&wakeup_eint>; - interrupts = <26 0>; + interrupts = <26 IRQ_TYPE_LEVEL_LOW>; reg = <0x09>; #clock-cells = <1>; diff --git a/Documentation/devicetree/bindings/mfd/max77686.txt b/Documentation/devicetree/bindings/mfd/max77686.txt index 42968b7144e0..4447d074894a 100644 --- a/Documentation/devicetree/bindings/mfd/max77686.txt +++ b/Documentation/devicetree/bindings/mfd/max77686.txt @@ -21,6 +21,6 @@ Example: max77686: pmic@9 { compatible = "maxim,max77686"; interrupt-parent = <&wakeup_eint>; - interrupts = <26 0>; + interrupts = <26 IRQ_TYPE_LEVEL_LOW>; reg = <0x09>; }; diff --git a/Documentation/devicetree/bindings/regulator/max77686.txt b/Documentation/devicetree/bindings/regulator/max77686.txt index e9f7578ca09a..ff3d2dec8c4b 100644 --- a/Documentation/devicetree/bindings/regulator/max77686.txt +++ b/Documentation/devicetree/bindings/regulator/max77686.txt @@ -43,7 +43,7 @@ Example: max77686: pmic@9 { compatible = "maxim,max77686"; interrupt-parent = <&wakeup_eint>; - interrupts = <26 IRQ_TYPE_NONE>; + interrupts = <26 IRQ_TYPE_LEVEL_LOW>; reg = <0x09>; voltage-regulators { diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c index 2ad554b921d9..f9e12ab2bc75 100644 --- a/drivers/mfd/max77686.c +++ b/drivers/mfd/max77686.c @@ -209,8 +209,7 @@ static int max77686_i2c_probe(struct i2c_client *i2c) ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap, max77686->irq, - IRQF_TRIGGER_FALLING | IRQF_ONESHOT | - IRQF_SHARED, 0, irq_chip, + IRQF_ONESHOT | IRQF_SHARED, 0, irq_chip, &max77686->irq_data); if (ret < 0) { dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret); -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-12-10 21:41 UTC|newest] Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-12-10 21:25 [PATCH 01/18] ARM: dts: exynos: correct fuel gauge interrupt trigger level on GT-I9100 Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 02/18] ARM: dts: exynos: correct fuel gauge interrupt trigger level on P4 Note family Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 03/18] ARM: dts: exynos: correct fuel gauge interrupt trigger level on Midas family Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-29 15:43 ` Krzysztof Kozlowski 2020-12-29 15:43 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 04/18] ARM: dts: exynos: correct MUIC " Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 05/18] ARM: dts: exynos: correct PMIC " Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 06/18] ARM: dts: exynos: correct PMIC interrupt trigger level on Odroid X/U3 family Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 07/18] ARM: dts: exynos: correct PMIC interrupt trigger level on P4 Note family Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 08/18] ARM: dts: exynos: correct PMIC interrupt trigger level on SMDK5250 Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 09/18] ARM: dts: exynos: correct PMIC interrupt trigger level on Snow Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 10/18] ARM: dts: s5pv210: correct fuel gauge interrupt trigger level on Fascinate family Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [PATCH 11/18] ARM: dts: qcom: msm8974-lge-nexus5: correct fuel gauge interrupt trigger level Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-11 15:29 ` Iskren Chernev 2020-12-11 15:29 ` Iskren Chernev 2020-12-10 21:25 ` [PATCH 12/18] ARM: dts: qcom: msm8974-samsung-klte: " Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-11 15:25 ` Iskren Chernev 2020-12-11 15:25 ` Iskren Chernev 2020-12-10 21:25 ` Krzysztof Kozlowski [this message] 2020-12-10 21:25 ` [RFC 13/18] mfd: max77686: Do not enforce (incorrect) interrupt trigger type Krzysztof Kozlowski 2020-12-21 18:45 ` Rob Herring 2020-12-21 18:45 ` Rob Herring 2020-12-10 21:25 ` [RFC 14/18] rtc: " Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [RFC 15/18] mfd: max77693: " Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-21 18:46 ` Rob Herring 2020-12-21 18:46 ` Rob Herring 2020-12-10 21:25 ` [RFC 16/18] power: supply: max17042: " Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 21:25 ` [RFC 17/18] mfd: max14577: " Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-21 18:47 ` Rob Herring 2020-12-21 18:47 ` Rob Herring 2020-12-10 21:25 ` [RFC 18/18] power: supply: max17040: " Krzysztof Kozlowski 2020-12-10 21:25 ` Krzysztof Kozlowski 2020-12-10 22:16 ` Sebastian Reichel 2020-12-11 7:52 ` Krzysztof Kozlowski 2020-12-11 7:47 ` Krzysztof Kozlowski 2020-12-11 7:47 ` Krzysztof Kozlowski 2020-12-11 15:44 ` Iskren Chernev 2020-12-11 15:44 ` Iskren Chernev 2020-12-11 15:51 ` Krzysztof Kozlowski 2020-12-11 15:51 ` Krzysztof Kozlowski 2021-03-03 18:19 ` [PATCH 01/18] ARM: dts: exynos: correct fuel gauge interrupt trigger level on GT-I9100 Krzysztof Kozlowski 2021-03-03 18:19 ` Krzysztof Kozlowski
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