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49d22c70aa
The TRF7970A has configuration options for supporting hardware designs with 1.8 Volt or 3.3 Volt IO. This commit adds a device tree option, using a fixed regulator binding, for setting the io voltage to match the hardware configuration. If no option is supplied it defaults to 3.3 volt configuration. Acked-by: Rob Herring <robh@kernel.org> Acked-by: Mark Greer <mgreer@animalcreek.com> Signed-off-by: Geoff Lansberry <geoff@kuvee.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
53 lines
1.8 KiB
Plaintext
53 lines
1.8 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: One or two GPIO entries used for 'EN' and 'EN2' pins on the
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TRF7970A. EN2 is optional.
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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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- t5t-rmb-extra-byte-quirk: Specify that the trf7970a has the erratum
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where an extra byte is returned by Read Multiple Block commands issued
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to Type 5 tags.
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- vdd-io-supply: Regulator specifying voltage for vdd-io
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- clock-frequency: Set to specify that the input frequency to the trf7970a is 13560000Hz or 27120000Hz
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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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vdd-io-supply = <&ldo2_reg>;
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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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t5t-rmb-extra-byte-quirk;
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clock-frequency = <27120000>;
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status = "okay";
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};
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};
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