Messages in this thread Patch in this message | | | From | Dmitry Torokhov <> | Subject | [PATCH 2/3] arm64: dts: qcom: msm8916-samsung-a2015: fix polarity of "enable" line of NFC chip | Date | Wed, 28 Sep 2022 18:15:56 -0700 |
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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@gmail.com> --- arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi b/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi index 3255bd3fcb55..5f7cec347a4f 100644 --- a/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi +++ b/arch/arm64/boot/dts/qcom/msm8916-samsung-a2015-common.dtsi @@ -144,7 +144,7 @@ nfc@27 { interrupt-parent = <&msmgpio>; interrupts = <21 IRQ_TYPE_EDGE_RISING>; - en-gpios = <&msmgpio 20 GPIO_ACTIVE_HIGH>; + en-gpios = <&msmgpio 20 GPIO_ACTIVE_LOW>; wake-gpios = <&msmgpio 49 GPIO_ACTIVE_HIGH>; clocks = <&rpmcc RPM_SMD_BB_CLK2_PIN>; -- 2.38.0.rc1.362.ged0d419d3c-goog
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