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From: Rob Herring <robh@kernel.org>
To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Michael Turquette <mturquette@baylibre.com>,
	Angus Ainslie <angus@akkea.ca>,
	Sebastian Reichel <sre@kernel.org>,
	Iskren Chernev <iskren.chernev@gmail.com>,
	Lee Jones <lee.jones@linaro.org>,
	linux-clk@vger.kernel.org, linux-rtc@vger.kernel.org,
	linux-samsung-soc@vger.kernel.org,
	Matheus Castello <matheus@castello.eng.br>,
	Chanwoo Choi <cw00.choi@samsung.com>,
	Andy Gross <agross@kernel.org>,
	devicetree@vger.kernel.org,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	linux-arm-msm@vger.kernel.org,
	Hans de Goede <hdegoede@redhat.com>,
	Mark Brown <broonie@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	linux-arm-kernel@lists.infradead.org,
	Alessandro Zummo <a.zummo@towertech.it>,
	Stephen Boyd <sboyd@kernel.org>,
	linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Rob Herring <robh+dt@kernel.org>,
	Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
Subject: Re: [RFC 17/18] mfd: max14577: Do not enforce (incorrect) interrupt trigger type
Date: Mon, 21 Dec 2020 11:47:07 -0700
Message-ID: <20201221184707.GA344409@robh.at.kernel.org> (raw)
In-Reply-To: <20201210212534.216197-17-krzk@kernel.org>

On Thu, 10 Dec 2020 22:25:33 +0100, Krzysztof Kozlowski wrote:
> 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 <krzk@kernel.org>
> 
> ---
> 
> This patch should wait till DTS changes are merged, as it relies on
> proper Devicetree.
> ---
>  Documentation/devicetree/bindings/mfd/max14577.txt | 4 ++--
>  drivers/mfd/max14577.c                             | 6 +++---
>  2 files changed, 5 insertions(+), 5 deletions(-)
> 

Acked-by: Rob Herring <robh@kernel.org>

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Thread overview: 28+ 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 ` [PATCH 02/18] ARM: dts: exynos: correct fuel gauge interrupt trigger level on P4 Note family Krzysztof Kozlowski
2020-12-10 21:25 ` [PATCH 03/18] ARM: dts: exynos: correct fuel gauge interrupt trigger level on Midas family Krzysztof Kozlowski
2020-12-29 15:43   ` Krzysztof Kozlowski
2020-12-10 21:25 ` [PATCH 04/18] ARM: dts: exynos: correct MUIC " Krzysztof Kozlowski
2020-12-10 21:25 ` [PATCH 05/18] ARM: dts: exynos: correct PMIC " 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 ` [PATCH 07/18] ARM: dts: exynos: correct PMIC interrupt trigger level on P4 Note family 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 ` [PATCH 09/18] ARM: dts: exynos: correct PMIC interrupt trigger level on Snow 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 ` [PATCH 11/18] ARM: dts: qcom: msm8974-lge-nexus5: correct fuel gauge interrupt trigger level Krzysztof Kozlowski
2020-12-11 15:29   ` Iskren Chernev
2020-12-10 21:25 ` [PATCH 12/18] ARM: dts: qcom: msm8974-samsung-klte: " Krzysztof Kozlowski
2020-12-11 15:25   ` Iskren Chernev
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
2020-12-10 21:25 ` [RFC 14/18] rtc: " Krzysztof Kozlowski
2020-12-10 21:25 ` [RFC 15/18] mfd: max77693: " Krzysztof Kozlowski
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 ` [RFC 17/18] mfd: max14577: " Krzysztof Kozlowski
2020-12-21 18:47   ` Rob Herring [this message]
2020-12-10 21:25 ` [RFC 18/18] power: supply: max17040: " Krzysztof Kozlowski
2020-12-11  7:47   ` Krzysztof Kozlowski
2020-12-11 15:44     ` Iskren Chernev
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

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