From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 58A66C4708E for ; Wed, 26 May 2021 17:20:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 296CB611B0 for ; Wed, 26 May 2021 17:20:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234405AbhEZRWZ (ORCPT ); Wed, 26 May 2021 13:22:25 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:36715 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234365AbhEZRWY (ORCPT ); Wed, 26 May 2021 13:22:24 -0400 Received: from mail-ua1-f72.google.com ([209.85.222.72]) by youngberry.canonical.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1llxD9-0003Vy-BR for linux-clk@vger.kernel.org; Wed, 26 May 2021 17:20:51 +0000 Received: by mail-ua1-f72.google.com with SMTP id b8-20020ab026c80000b029020f97f38cfcso1114003uap.3 for ; Wed, 26 May 2021 10:20:51 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=YMY2yvxHNG1nkzYJPg4/G4TbXbdFqsqs8hq2uBFV7DI=; b=s4CXLvANyz18w4giaihWPNHTJHNsMyQR0fLFIlBkpz1LaMp7C6H2oKaesbyck2i0Lj xVyMld0hJcqWi4A765tDOD94zPHcHXendOssvMweG8v9luDZZyn6MRg6AO0xXvArjdWb fiojYXgCh3Gd1Mo676WNKJuBmX8pzHBT0ht2llloDjLG7K+YbWqqjKhKxiNq7tFxB+Fe 8veYnnNbrptI1LOoS92FSI7XA+/Ke3V81+OmTEHkE2Y1Xfwryd9d60r080b39T++zuEk M0ek0dqJzbhjQUPMRNAEg7e0d3TmUNPN2zBHY2m5NxFsvajThRQSBS3TpOjK3mYWvnwy FRlw== X-Gm-Message-State: AOAM530J6hcgK+Gb4Cf3iWkAsf4L8HEFL/4QO0146kUSXKYGbayL7nQd 1vLYOE8sHUXwdbAhwV+R/uj0kY7SrpYexTMzlCSx9Fz1QSKgj6mN//CcLWM8t+LeHYdXz50QNJq OD0a8oTEl4KuGgaDANgVn1unfu/bDWa6/Iw8psg== X-Received: by 2002:ab0:60c5:: with SMTP id g5mr33849462uam.5.1622049650414; Wed, 26 May 2021 10:20:50 -0700 (PDT) X-Google-Smtp-Source: ABdhPJybUIvC2EVKiQpagnKWUZU70TWT6eIvSvzu8uRFmvzo4oT1pL7W1A2sY8ZZ5oe7mDhPI5A4nw== X-Received: by 2002:ab0:60c5:: with SMTP id g5mr33849422uam.5.1622049650219; Wed, 26 May 2021 10:20:50 -0700 (PDT) Received: from localhost.localdomain ([45.237.48.6]) by smtp.gmail.com with ESMTPSA id u195sm2036032vsc.10.2021.05.26.10.20.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 May 2021 10:20:49 -0700 (PDT) From: Krzysztof Kozlowski To: Chanwoo Choi , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz , Michael Turquette , Stephen Boyd , Rob Herring , Lee Jones , Sebastian Reichel , Liam Girdwood , Mark Brown , Alessandro Zummo , Alexandre Belloni , 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 Cc: Krzysztof Kozlowski , Rob Herring Subject: [PATCH v2 2/7] mfd: max77686: Do not enforce (incorrect) interrupt trigger type Date: Wed, 26 May 2021 13:20:31 -0400 Message-Id: <20210526172036.183223-3-krzysztof.kozlowski@canonical.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210526172036.183223-1-krzysztof.kozlowski@canonical.com> References: <20210526172036.183223-1-krzysztof.kozlowski@canonical.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-clk@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 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 Acked-by: Rob Herring --- Changes since v1: 1. Add ack. --- 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); -- 2.27.0