From ab0f0987e035f908d670fed7d86efa6fac66c0bb Mon Sep 17 00:00:00 2001 From: Stephan Gerhold Date: Mon, 4 Oct 2021 22:19:12 +0200 Subject: [PATCH] arm64: dts: qcom: msm8916-samsung-serranove: Add NFC The LTE version of the S4 Mini VE has a NXP PN547, which is supported by the nxp-nci-i2c driver in mainline. It seems to detect NFC tags using "nfctool" just fine, although more testing is difficult given there seem to be very few useful applications making use of the Linux NFC subsystem. :( Note that for some reason Samsung decided to connect the I2C pins to GPIOs where no hardware I2C bus is available, so we need to fall back to software bit-banging with i2c-gpio. Signed-off-by: Stephan Gerhold Signed-off-by: Bjorn Andersson Link: https://lore.kernel.org/r/20211004201921.18526-7-stephan@gerhold.net --- .../dts/qcom/msm8916-samsung-serranove.dts | 50 +++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts b/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts index 3ef00bdc043ec..a78f87a5bf4f4 100644 --- a/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts +++ b/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts @@ -168,6 +168,32 @@ pinctrl-0 = <&tkey_default>; }; }; + + i2c-nfc { + compatible = "i2c-gpio"; + sda-gpios = <&msmgpio 0 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>; + scl-gpios = <&msmgpio 1 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>; + + pinctrl-names = "default"; + pinctrl-0 = <&nfc_i2c_default>; + + #address-cells = <1>; + #size-cells = <0>; + + nfc@2b { + compatible = "nxp,pn547", "nxp,nxp-nci-i2c"; + reg = <0x2b>; + + interrupt-parent = <&msmgpio>; + interrupts = <21 IRQ_TYPE_EDGE_RISING>; + + enable-gpios = <&msmgpio 20 GPIO_ACTIVE_HIGH>; + firmware-gpios = <&msmgpio 49 GPIO_ACTIVE_HIGH>; + + pinctrl-names = "default"; + pinctrl-0 = <&nfc_default>; + }; + }; }; &blsp_i2c2 { @@ -434,6 +460,30 @@ bias-disable; }; + nfc_default: nfc-default { + pins = "gpio20", "gpio49"; + function = "gpio"; + + drive-strength = <2>; + bias-disable; + + irq { + pins = "gpio21"; + function = "gpio"; + + drive-strength = <2>; + bias-pull-down; + }; + }; + + nfc_i2c_default: nfc-i2c-default { + pins = "gpio0", "gpio1"; + function = "gpio"; + + drive-strength = <2>; + bias-disable; + }; + tkey_default: tkey-default { pins = "gpio98"; function = "gpio"; -- 2.30.2