linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845-oneplus-common: add PN553 NFC

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Date:   Tue, 7 Mar 2023 19:37:17 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Gergo Koteles <soyer@....hu>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sdm845-oneplus-common: add PN553 NFC



On 7.03.2023 19:32, Gergo Koteles wrote:
> The OnePlus 6/6T both have a NQ330 (PN553 + P73N2M0).
> The PN533 supported by the nxp-nci-i2c driver in mainline.
> It detects/reads NFC tags using "nfctool".
> 
> Signed-off-by: Gergo Koteles <soyer@....hu>
> ---
>  .../boot/dts/qcom/sdm845-oneplus-common.dtsi  | 33 +++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
> index 64638ea94db7..4dfc9ade7596 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845-oneplus-common.dtsi
> @@ -380,6 +380,25 @@ zap-shader {
>  	};
>  };
>  
> +&i2c3 {
> +	status = "okay";
> +	clock-frequency = <400000>;
status last

> +
> +	nfc@28 {
> +		compatible = "nxp,nxp-nci-i2c";
> +		reg = <0x28>;
> +
> +		interrupt-parent = <&tlmm>;
> +		interrupts = <63 IRQ_TYPE_EDGE_RISING>;
interrupts-extended = <&tlmm 63 IRQ_TYPE_EDGE_RISING>;
> +
> +		enable-gpios = <&tlmm 12 GPIO_ACTIVE_HIGH>;
> +		firmware-gpios = <&tlmm 62 GPIO_ACTIVE_HIGH>;
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&nfc_int_active &nfc_enable_active>;
property-n
property-names

> +	};
> +};
> +
>  &i2c10 {
>  	status = "okay";
>  	clock-frequency = <100000>;
> @@ -753,6 +772,20 @@ &usb_1_hsphy {
>  &tlmm {
>  	gpio-reserved-ranges = <0 4>, <81 4>;
>  
> +	nfc_int_active: nfc-int-active-state {
> +		pins = "gpio63";
> +		function = "gpio";
> +		drive-strength = <2>;
> +		bias-pull-up;
> +	};
> +
> +	nfc_enable_active: nfc-enable-active-state {
While it works as-is, I think adding a separate gpio node
for the firmware pin would make more sense logically.

Konrad
> +		pins = "gpio12", "gpio62";
> +		function = "gpio";
> +		drive-strength = <2>;
> +		bias-pull-up;
> +	};
> +
>  	tri_state_key_default: tri-state-key-default-state {
>  		pins = "gpio40", "gpio42", "gpio26";
>  		function = "gpio";