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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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2bee162a28
Add option to reduce the RX antenna gain to be able to reduce the sensitivity. Signed-off-by: Paul Geurts <paul.geurts@prodrive-technologies.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://patch.msgid.link/20250626141242.3749958-2-paul.geurts@prodrive-technologies.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
107 lines
2.6 KiB
YAML
107 lines
2.6 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/net/nfc/ti,trf7970a.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Texas Instruments TRF7970A RFID/NFC/15693 Transceiver
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maintainers:
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- Krzysztof Kozlowski <krzk@kernel.org>
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- Mark Greer <mgreer@animalcreek.com>
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properties:
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compatible:
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const: ti,trf7970a
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autosuspend-delay:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: |
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Specify autosuspend delay in milliseconds.
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clock-frequency:
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description: |
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Set to specify that the input frequency to the trf7970a is 13560000Hz or
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27120000Hz
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en2-rf-quirk:
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type: boolean
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description: |
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Specify that the trf7970a being used has the "EN2 RF" erratum
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interrupts:
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maxItems: 1
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irq-status-read-quirk:
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type: boolean
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description: |
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Specify that the trf7970a being used has the "IRQ Status Read" erratum
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reg:
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maxItems: 1
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ti,enable-gpios:
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minItems: 1
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maxItems: 2
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description: |
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One or two GPIO entries used for 'EN' and 'EN2' pins on the TRF7970A. EN2
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is optional.
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vdd-io-supply:
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description: |
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Regulator specifying voltage for VDD-IO
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vin-supply:
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description: |
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Regulator for supply voltage to VIN pin
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ti,rx-gain-reduction-db:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: |
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Specify an RX gain reduction to reduce antenna sensitivity with 5dB per
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increment, with a maximum of 15dB. Supported values: [0, 5, 10, 15].
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required:
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- compatible
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- interrupts
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- reg
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- spi-max-frequency
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- ti,enable-gpios
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- vin-supply
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allOf:
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- $ref: /schemas/spi/spi-peripheral-props.yaml#
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/interrupt-controller/irq.h>
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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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_HIGH>,
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<&gpio2 5 GPIO_ACTIVE_HIGH>;
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vin-supply = <&ldo3_reg>;
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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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clock-frequency = <27120000>;
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ti,rx-gain-reduction-db = <15>;
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};
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};
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