Re: [PATCH] arm64: dts: qcom: sdm845-lg: Enable NFC

[David Heidelberg]

On 03/09/2026 04:03, Paul Sajna wrote:
> Add the i2c and tlmm nodes to support the NXP PN547 NFC chip
>
> Downstream dtsi for reference:
> https://github.com/LineageOS/android_kernel_lge_sdm845/blob/lineage-22.2/arch/arm64/boot/dts/lge/sdm845-judy/sdm845-judyln_lao_com/sdm845-judyln_lao_com-nfc.dtsi
>
> Signed-off-by: Paul Sajna <sajattack@xxxxxxxxxxxxxxxx>
> ---
>   arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi | 31 ++++++++++++++++++++++++++
>   1 file changed, 31 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi b/arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi
> index b030a10009c5..069d1cf3dead 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845-lg-common.dtsi
> @@ -471,6 +471,25 @@ &gpu {
>   	status = "okay";
>   };
>   
> +&i2c3 {
> +	clock-frequency = <1000000>;
> +
> +	status = "okay";
> +
> +	nfc@28 {
> +		compatible = "nxp,pn547", "nxp,nxp-nci-i2c";
> +		reg = <0x28>;
> +
> +		interrupts-extended = <&tlmm 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";
> +	};
> +};
> +
>   &ipa {
>   	status = "okay";
>   };
> @@ -551,6 +570,11 @@ &qupv3_id_1 {
>   	status = "okay";
>   };
>   
> +&qup_i2c3_default {
> +	drive-strength = <2>;
> +	bias-disable;
> +};
> +
>   &qup_uart9_rx {
>   	drive-strength = <2>;
>   	bias-pull-up;
> @@ -609,6 +633,13 @@ sd_card_det_n: sd-card-det-n-state {
>   		function = "gpio";
>   		bias-pull-up;
>   	};
> +
> +	nfc_default: nfc-default-state {
> +		pins = "gpio12", "gpio62", "gpio63";

if you want to, you could make it more descriptive with -pins,

see

https://lore.kernel.org/all/20260902-sdm670-sargo-nfc-v1-2-bed1cbbffc46@xxxxxxx/

David

> +		function = "gpio";
> +		drive-strength = <6>;
> +		bias-pull-up;
> +	};
>   };
>   
>   &uart6 {
>
> ---
> base-commit: 32b6ef9a5d0eca44f9cd91f52f4faa89f145a0de
> change-id: 20260902-sdm845-lg-judy-nfc-5f9e5775393d
>
> Best regards,