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[188.155.185.9]) by smtp.gmail.com with ESMTPSA id f5sm6948175wrf.22.2021.06.02.04.04.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Jun 2021 04:04:57 -0700 (PDT) From: Krzysztof Kozlowski To: Chanwoo Choi , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz , Lee Jones , Liam Girdwood , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org Cc: Krzysztof Kozlowski , Rob Herring Subject: [RESEND PATCH v2 4/4] mfd: max14577: Do not enforce (incorrect) interrupt trigger type Date: Wed, 2 Jun 2021 13:04:45 +0200 Message-Id: <20210602110445.33536-4-krzysztof.kozlowski@canonical.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210602110445.33536-1-krzysztof.kozlowski@canonical.com> References: <20210602110445.33536-1-krzysztof.kozlowski@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Krzysztof Kozlowski 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. The interrupt line is shared between PMIC and charger 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 Acked-by: Rob Herring --- Changes since v1: 1. Add Ack --- Documentation/devicetree/bindings/mfd/max14577.txt | 4 ++-- drivers/mfd/max14577.c | 6 +++--- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/Documentation/devicetree/bindings/mfd/max14577.txt b/Documentation/devicetree/bindings/mfd/max14577.txt index 92070b346756..be11943a0560 100644 --- a/Documentation/devicetree/bindings/mfd/max14577.txt +++ b/Documentation/devicetree/bindings/mfd/max14577.txt @@ -71,7 +71,7 @@ max14577@25 { compatible = "maxim,max14577"; reg = <0x25>; interrupt-parent = <&gpx1>; - interrupts = <5 IRQ_TYPE_NONE>; + interrupts = <5 IRQ_TYPE_LEVEL_LOW>; muic: max14577-muic { compatible = "maxim,max14577-muic"; @@ -106,7 +106,7 @@ max77836@25 { compatible = "maxim,max77836"; reg = <0x25>; interrupt-parent = <&gpx1>; - interrupts = <5 IRQ_TYPE_NONE>; + interrupts = <5 IRQ_TYPE_LEVEL_LOW>; muic: max77836-muic { compatible = "maxim,max77836-muic"; diff --git a/drivers/mfd/max14577.c b/drivers/mfd/max14577.c index be185e9d5f16..6c487fa14e9c 100644 --- a/drivers/mfd/max14577.c +++ b/drivers/mfd/max14577.c @@ -332,7 +332,7 @@ static int max77836_init(struct max14577 *max14577) } ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq, - IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED, + IRQF_ONESHOT | IRQF_SHARED, 0, &max77836_pmic_irq_chip, &max14577->irq_data_pmic); if (ret != 0) { @@ -418,14 +418,14 @@ static int max14577_i2c_probe(struct i2c_client *i2c, irq_chip = &max77836_muic_irq_chip; mfd_devs = max77836_devs; mfd_devs_size = ARRAY_SIZE(max77836_devs); - irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED; + irq_flags = IRQF_ONESHOT | IRQF_SHARED; break; case MAXIM_DEVICE_TYPE_MAX14577: default: irq_chip = &max14577_irq_chip; mfd_devs = max14577_devs; mfd_devs_size = ARRAY_SIZE(max14577_devs); - irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT; + irq_flags = IRQF_ONESHOT; break; }