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arm64: dts: qcom: milos-fairphone-fp6: add NFC

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Add the Samsung S3NRN4V NFC + eSE controller on i2c1. Its XI clock is
provided by the RF_CLK2 PMIC buffer and gated through the controller's
CLK_REQ line on tlmm GPIO6.

The enable line is routed to the chip's power-down input, which is
asserted high to turn the chip off (the downstream driver treats VEN as
active-low on this design) -- hence GPIO_ACTIVE_HIGH, unlike the
exynos5433-tm2 wiring of the same driver. The pin is pulled up so the
chip stays off while the line is not driven.

Assisted-by: Claude:claude-opus-4-8
Assisted-by: Claude:claude-fable-5
Signed-off-by: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
This commit is contained in:
Jorijn van der Graaf 2026-06-29 00:23:51 +02:00
commit ca18951e10
1 changed files with 45 additions and 2 deletions
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47
arch/arm64/boot/dts/qcom/milos-fairphone-fp6.dts
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@ -700,9 +700,27 @@
};
&i2c1 {
/* Samsung NFC @ 0x27 */
status = "okay";
/*
* Samsung S3NRN4V NFC controller. XI is driven by the RF_CLK2 PMIC
* buffer; the chip has no own oscillator and gates the clock via its
* CLK_REQ line, so the clock must be voted on in response to it.
*/
nfc@27 {
compatible = "samsung,s3nrn4v-i2c";
reg = <0x27>;
clk-req-gpios = <&tlmm 6 GPIO_ACTIVE_HIGH>;
clocks = <&rpmhcc RPMH_RF_CLK2>;
en-gpios = <&tlmm 56 GPIO_ACTIVE_HIGH>;
interrupt-parent = <&tlmm>;
interrupts = <31 IRQ_TYPE_EDGE_RISING>;
pinctrl-0 = <&nfc_clk_req_default>, <&nfc_irq_default>,
<&nfc_pd_default>;
pinctrl-names = "default";
wake-gpios = <&tlmm 7 GPIO_ACTIVE_HIGH>;
};
};
&i2c3 {
@ -1093,6 +1111,13 @@
<13 1>, /* NC */
<63 2>; /* WLAN UART */
nfc_clk_req_default: nfc-clk-req-default-state {
pins = "gpio6";
function = "gpio";
drive-strength = <2>;
bias-disable;
};
disp_reset_n_active: disp-reset-n-active-state {
pins = "gpio12";
function = "gpio";
@ -1121,6 +1146,13 @@
bias-disable;
};
nfc_irq_default: nfc-irq-default-state {
pins = "gpio31";
function = "gpio";
drive-strength = <2>;
bias-disable;
};
qup_uart11_sleep_cts: qup-uart11-sleep-cts-state {
pins = "gpio48";
function = "gpio";
@ -1174,6 +1206,17 @@
bias-disable;
};
/*
* Pulled up so the NFC chip stays powered down while the line is
* not driven (it is the chip's active-high power-down input).
*/
nfc_pd_default: nfc-pd-default-state {
pins = "gpio56";
function = "gpio";
drive-strength = <2>;
bias-pull-up;
};
sdc2_card_det_n: sdc2-card-det-state {
pins = "gpio65";
function = "gpio";