linux-kernel - [PATCH 1/3] arm64: dts: exynos: fix polarity of "enable" line of NFC chip

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Date:   Wed, 28 Sep 2022 18:15:55 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Krzysztof Opasiak <k.opasiak@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Andy Gross <agross@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] arm64: dts: exynos: fix polarity of "enable" line of NFC chip

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>
---
 arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
index 91c9bd1b47dd..bde6a6bb8dfc 100644
--- a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
@@ -795,7 +795,7 @@ s3fwrn5: nfc@27 {
 		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>;
 	};
 };
-- 
2.38.0.rc1.362.ged0d419d3c-goog