6afed0eb8c
Current versions of the trf7970a have an erratum where the EN2 pin must be kept low. If it isn't kept low, it will generate an RF field even when in passive target mode. To work around this issue, create the 'en2-rf-quirk' device tree property to indicate that the trf7970a that the driver is using has this erratum. Signed-off-by: Mark A. Greer <mgreer@animalcreek.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
45 lines
1.4 KiB
Plaintext
45 lines
1.4 KiB
Plaintext
* Texas Instruments TRF7970A RFID/NFC/15693 Transceiver
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Required properties:
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- compatible: Should be "ti,trf7970a".
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- spi-max-frequency: Maximum SPI frequency (<= 2000000).
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- interrupt-parent: phandle of parent interrupt handler.
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- interrupts: A single interrupt specifier.
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- ti,enable-gpios: Two GPIO entries used for 'EN' and 'EN2' pins on the
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TRF7970A.
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- vin-supply: Regulator for supply voltage to VIN pin
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Optional SoC Specific Properties:
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- pinctrl-names: Contains only one value - "default".
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- pintctrl-0: Specifies the pin control groups used for this controller.
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- autosuspend-delay: Specify autosuspend delay in milliseconds.
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- vin-voltage-override: Specify voltage of VIN pin in microvolts.
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- irq-status-read-quirk: Specify that the trf7970a being used has the
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"IRQ Status Read" erratum.
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- en2-rf-quirk: Specify that the trf7970a being used has the "EN2 RF"
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erratum.
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Example (for ARM-based BeagleBone with TRF7970A on SPI1):
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&spi1 {
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status = "okay";
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nfc@0 {
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compatible = "ti,trf7970a";
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reg = <0>;
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pinctrl-names = "default";
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pinctrl-0 = <&trf7970a_default>;
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spi-max-frequency = <2000000>;
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interrupt-parent = <&gpio2>;
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interrupts = <14 0>;
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ti,enable-gpios = <&gpio2 2 GPIO_ACTIVE_LOW>,
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<&gpio2 5 GPIO_ACTIVE_LOW>;
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vin-supply = <&ldo3_reg>;
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vin-voltage-override = <5000000>;
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autosuspend-delay = <30000>;
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irq-status-read-quirk;
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en2-rf-quirk;
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status = "okay";
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};
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};
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