From patchwork Thu Dec 10 21:25:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 341523 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=-17.0 required=3.0 tests=BAYES_00, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 75B49C4361B for ; Thu, 10 Dec 2020 21:40:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 490D923DE3 for ; Thu, 10 Dec 2020 21:40:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404881AbgLJV1i (ORCPT ); Thu, 10 Dec 2020 16:27:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:38786 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404919AbgLJV1g (ORCPT ); Thu, 10 Dec 2020 16:27:36 -0500 From: Krzysztof Kozlowski Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) To: Chanwoo Choi , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz , Michael Turquette , Stephen Boyd , Rob Herring , Lee Jones , Sebastian Reichel , Liam Girdwood , Mark Brown , Andy Gross , Bjorn Andersson , Alessandro Zummo , Alexandre Belloni , 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 , Matheus Castello , Sebastian Krzyszkowiak , Angus Ainslie , Hans de Goede Subject: [RFC 15/18] mfd: max77693: Do not enforce (incorrect) interrupt trigger type Date: Thu, 10 Dec 2020 22:25:31 +0100 Message-Id: <20201210212534.216197-15-krzk@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201210212534.216197-1-krzk@kernel.org> References: <20201210212534.216197-1-krzk@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.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 77693 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 --- This patch should wait till DTS changes are merged, as it relies on proper Devicetree. --- Documentation/devicetree/bindings/mfd/max77693.txt | 2 +- drivers/mfd/max77693.c | 12 ++++-------- 2 files changed, 5 insertions(+), 9 deletions(-) diff --git a/Documentation/devicetree/bindings/mfd/max77693.txt b/Documentation/devicetree/bindings/mfd/max77693.txt index 0ced96e16c16..1032df14498b 100644 --- a/Documentation/devicetree/bindings/mfd/max77693.txt +++ b/Documentation/devicetree/bindings/mfd/max77693.txt @@ -139,7 +139,7 @@ Example: compatible = "maxim,max77693"; reg = <0x66>; interrupt-parent = <&gpx1>; - interrupts = <5 2>; + interrupts = <5 IRQ_TYPE_LEVEL_LOW>; regulators { esafeout@1 { diff --git a/drivers/mfd/max77693.c b/drivers/mfd/max77693.c index 596ed85cab3b..4e6244e17559 100644 --- a/drivers/mfd/max77693.c +++ b/drivers/mfd/max77693.c @@ -222,8 +222,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c, } ret = regmap_add_irq_chip(max77693->regmap, max77693->irq, - IRQF_ONESHOT | IRQF_SHARED | - IRQF_TRIGGER_FALLING, 0, + IRQF_ONESHOT | IRQF_SHARED, 0, &max77693_led_irq_chip, &max77693->irq_data_led); if (ret) { @@ -232,8 +231,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c, } ret = regmap_add_irq_chip(max77693->regmap, max77693->irq, - IRQF_ONESHOT | IRQF_SHARED | - IRQF_TRIGGER_FALLING, 0, + IRQF_ONESHOT | IRQF_SHARED, 0, &max77693_topsys_irq_chip, &max77693->irq_data_topsys); if (ret) { @@ -242,8 +240,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c, } ret = regmap_add_irq_chip(max77693->regmap, max77693->irq, - IRQF_ONESHOT | IRQF_SHARED | - IRQF_TRIGGER_FALLING, 0, + IRQF_ONESHOT | IRQF_SHARED, 0, &max77693_charger_irq_chip, &max77693->irq_data_chg); if (ret) { @@ -252,8 +249,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c, } ret = regmap_add_irq_chip(max77693->regmap_muic, max77693->irq, - IRQF_ONESHOT | IRQF_SHARED | - IRQF_TRIGGER_FALLING, 0, + IRQF_ONESHOT | IRQF_SHARED, 0, &max77693_muic_irq_chip, &max77693->irq_data_muic); if (ret) {