57 lines
2.1 KiB
Plaintext
57 lines
2.1 KiB
Plaintext
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Qualcomm QCA199x NFC NCI device
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Near Field Communication (NFC) device is based on NFC Controller Interface (NCI)
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Required properties:
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- compatible: "qcom,nfc-nci"
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- reg: NCI i2c slave address.
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- qcom,dis-gpio: specific gpio for hardware reset.
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- qcom,irq-gpio: specific gpio for read interrupt.
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- qcom,clk-src: nfc clock source ("BBCLK2", "RFCLK3", "GPCLK", "GPCLK2", ...)
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- interrupt-parent: Should be phandle for the interrupt controller
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that services interrupts for this device.
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- interrupts: Nfc read interrupt,gpio-clk-req interrupt
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Recommended properties:
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- interrupt-names: names of interupts, should include "nfc_irq", used for reference
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Optional properties:
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- qcom,pwr-req-gpio: pmic gpio to vote for power to be supplied to the uicc
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- qcom,clk-src-gpio: msm gpio clock,used only if clock source is msm gpio
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- qcom,clk-req-gpio: clk-req input gpio for MSM based clocks.
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not used for pmic implementation
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- qcom,clk-gpio: pmic or msm gpio on which bbclk2 signal is coming.
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- pinctrl-names, pinctrl-0, pincntrl-1: references to our pincntrl settings
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- clocks, clock-names: must contain the QCA1990's core clock.
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note:
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nfc with msm type clock sources (GPCLK and GPCLK 2) require qcom,clk-src-gpio and qcom,clk-req-gpio entries to work propperly.
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nfc with pmic type clock sources (BBCLK2 RFCLK3) require the qcom,clk-gpio entry to function properly.
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The nfcc needs a core clock supplied in order to respond to nci messages.
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The driver currently votes for ref_clk if clock source is set to BBCLK2. Please ensure the clock indicated by clk-src is defined.
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Example:
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nfc-nci@e {
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compatible = "qcom,nfc-nci";
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reg = <0x0e>;
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qcom,irq-gpio = <&msm_gpio 21 0x00>;
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qcom,dis-gpio = <&msm_gpio 20 0x00>;
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qcom,clk-src = "BBCLK2";
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interrupt-parent = <&msm_gpio>;
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interrupts = <21 0>;
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interrupt-names = "nfc_irq";
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pinctrl-names = "nfc_active","nfc_suspend";
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pinctrl-0 = <&nfc_int_active &nfc_disable_active>;
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pinctrl-1 = <&nfc_int_suspend &nfc_disable_suspend>;
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qcom,clk-gpio = <&pm8916_gpios 2 0>;
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clocks = <&clock_rpm clk_bb_clk2_pin>;
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clock-names = "ref_clk";
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};
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