94d2adc9c0
Add reset-gpio support. Without reset's deassertion during ak8975_power_on(), driver's probe fails on ak8975_who_i_am() while checking for device identity for AK09911 chip. AK09911 has an active low reset gpio to handle register's reset. AK09911 datasheet says that, if not used, reset pin should be connected to VID. This patch emulates this situation. Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
84 lines
2.3 KiB
YAML
84 lines
2.3 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/iio/magnetometer/asahi-kasei,ak8975.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: AsahiKASEI AK8975 magnetometer sensor
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maintainers:
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- Jonathan Albrieux <jonathan.albrieux@gmail.com>
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properties:
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compatible:
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oneOf:
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- enum:
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- asahi-kasei,ak8975
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- asahi-kasei,ak8963
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- asahi-kasei,ak09911
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- asahi-kasei,ak09912
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- enum:
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- ak8975
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- ak8963
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- ak09911
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- ak09912
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deprecated: true
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reg:
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maxItems: 1
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gpios:
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maxItems: 1
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description: |
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AK8975 has a "Data ready" pin (DRDY) which informs that data
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is ready to be read and is possible to listen on it. If used,
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this should be active high. Prefer interrupt over this.
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interrupts:
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maxItems: 1
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description: interrupt for DRDY pin. Triggered on rising edge.
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vdd-supply:
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description: |
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an optional regulator that needs to be on to provide VDD power to
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the sensor.
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mount-matrix:
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description: an optional 3x3 mounting rotation matrix.
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reset-gpios:
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description: |
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an optional pin needed for AK09911 to set the reset state. This should
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be usually active low
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required:
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- compatible
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- reg
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examples:
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- |
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#include <dt-bindings/interrupt-controller/irq.h>
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#include <dt-bindings/gpio/gpio.h>
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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magnetometer@c {
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compatible = "asahi-kasei,ak8975";
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reg = <0x0c>;
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interrupt-parent = <&gpio6>;
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interrupts = <15 IRQ_TYPE_EDGE_RISING>;
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vdd-supply = <&ldo_3v3_gnss>;
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reset-gpios = <&msmgpio 111 GPIO_ACTIVE_LOW>;
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mount-matrix = "-0.984807753012208", /* x0 */
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"0", /* y0 */
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"-0.173648177666930", /* z0 */
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"0", /* x1 */
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"-1", /* y1 */
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"0", /* z1 */
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"-0.173648177666930", /* x2 */
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"0", /* y2 */
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"0.984807753012208"; /* z2 */
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};
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};
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