NFC support in Linux (and support for Qualcomm SDM845 devices)

[PATCH QUESTION 1/2] arm64: dts: qcom: sdm845-oneplus: Enable NFC

Posted by David Heidelberg via B4 Relay 1 week, 5 days ago

From: biemster <l.j.beemster@gmail.com>

Definition of the NFC.

Co-developed-by: David Heidelberg <david@ixit.cz>
Signed-off-by: David Heidelberg <david@ixit.cz>
---
 .../arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
index 5b121ea5520f5..34f476299b114 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
@@ -392,6 +392,26 @@ &gpu_zap_shader {
 	firmware-name = "qcom/sdm845/OnePlus/enchilada/a630_zap.mbn";
 };
 
+&i2c3 {
+	clock-frequency = <400000>;
+
+	status = "okay";
+
+	nfc@28 {
+		compatible = "nxp,nxp-nci-i2c";
+		reg = <0x28>;
+
+		interrupt-parent = <&tlmm>;
+		interrupts = <63 IRQ_TYPE_EDGE_RISING>;
+
+		enable-gpios = <&tlmm 12 GPIO_ACTIVE_HIGH>;
+		firmware-gpios = <&tlmm 62 GPIO_ACTIVE_HIGH>;
+
+		pinctrl-0 = <&nfc_default>;
+		pinctrl-names = "default";
+	};
+};
+
 &i2c10 {
 	status = "okay";
 	clock-frequency = <100000>;
@@ -594,6 +614,11 @@ &qupv3_id_0 {
 	status = "okay";
 };
 
+&qup_i2c3_default {
+	drive-strength = <2>;
+	bias-disable;
+};
+
 &qup_i2c10_default {
 	drive-strength = <2>;
 	bias-disable;
@@ -926,6 +951,13 @@ speaker_default: speaker-default-state {
 		bias-pull-up;
 		output-high;
 	};
+
+	nfc_default: nfc-default-state {
+		pins = "gpio12", "gpio62", "gpio63";
+		function = "gpio";
+		drive-strength = <6>;
+		bias-pull-up;
+	};
 };
 
 &venus {

-- 
2.53.0

Re: [PATCH QUESTION 1/2] arm64: dts: qcom: sdm845-oneplus: Enable NFC

Posted by Krzysztof Kozlowski 1 week, 4 days ago

On 22/03/2026 15:24, David Heidelberg via B4 Relay wrote:
> From: biemster <l.j.beemster@gmail.com>
> 
> Definition of the NFC.
> 

Incomplete DCO. We cannot take commits where author is anonymous and did
not sign the DCO.

You can however take ownership, after reading carefully the DCO
requirements and agreeing/certifying what they state.

> Co-developed-by: David Heidelberg <david@ixit.cz>
> Signed-off-by: David Heidelberg <david@ixit.cz>

Best regards,
Krzysztof

Re: [PATCH QUESTION 1/2] arm64: dts: qcom: sdm845-oneplus: Enable NFC

Posted by Konrad Dybcio 1 week, 4 days ago

On 3/22/26 3:24 PM, David Heidelberg via B4 Relay wrote:
> From: biemster <l.j.beemster@gmail.com>
> 
> Definition of the NFC.
> 
> Co-developed-by: David Heidelberg <david@ixit.cz>
> Signed-off-by: David Heidelberg <david@ixit.cz>
> ---
>  .../arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi | 32 ++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
> index 5b121ea5520f5..34f476299b114 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
> @@ -392,6 +392,26 @@ &gpu_zap_shader {
>  	firmware-name = "qcom/sdm845/OnePlus/enchilada/a630_zap.mbn";
>  };
>  
> +&i2c3 {
> +	clock-frequency = <400000>;
> +
> +	status = "okay";
> +
> +	nfc@28 {
> +		compatible = "nxp,nxp-nci-i2c";
> +		reg = <0x28>;
> +
> +		interrupt-parent = <&tlmm>;
> +		interrupts = <63 IRQ_TYPE_EDGE_RISING>;

interrupts-extended, please

Konrad