linux-kernel - [PATCH 6.0 451/862] arm64: dts: exynos: fix polarity of "enable" line of NFC chip in TM2

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Date:   Wed, 19 Oct 2022 10:28:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 451/862] arm64: dts: exynos: fix polarity of "enable" line of NFC chip in TM2

From: Dmitry Torokhov <dmitry.torokhov@...il.com>

[ Upstream commit bd1a665a01b4d65fd8dc6fece4b376fa5c8c55bb ]

According to s3fwrn5 driver code the "enable" GPIO line is driven "high"
when chip is not in use (mode is S3FWRN5_MODE_COLD), and is driven "low"
when chip is in use.

s3fwrn5_phy_power_ctrl():

	...
	gpio_set_value(phy->gpio_en, 1);
	...
	if (mode != S3FWRN5_MODE_COLD) {
		msleep(S3FWRN5_EN_WAIT_TIME);
		gpio_set_value(phy->gpio_en, 0);
		msleep(S3FWRN5_EN_WAIT_TIME);
	}

Therefore the line described by "en-gpios" property should be annotated
as "active low".

The wakeup gpio appears to have correct polarity (active high).

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Link: https://lore.kernel.org/r/20220929011557.4165216-1-dmitry.torokhov@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
@@ -795,7 +795,7 @@
 		reg = <0x27>;
 		interrupt-parent = <&gpa1>;
 		interrupts = <3 IRQ_TYPE_EDGE_RISING>;
-		en-gpios = <&gpf1 4 GPIO_ACTIVE_HIGH>;
+		en-gpios = <&gpf1 4 GPIO_ACTIVE_LOW>;
 		wake-gpios = <&gpj0 2 GPIO_ACTIVE_HIGH>;
 	};
 };