linux-kernel - Re: [PATCH 2/2] dt-bindings: iio: magnetometer: document Infineon TLV493D 3D Magnetic sensor

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Message-ID: <aIg6jRj6haYISlgj@dixit>
Date: Tue, 29 Jul 2025 08:35:49 +0530
From: Dixit Parmar <dixitparmar19@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: iio: magnetometer: document Infineon
 TLV493D 3D Magnetic sensor

On Sun, Jul 27, 2025 at 11:23:04AM +0200, Krzysztof Kozlowski wrote:
> On 26/07/2025 11:37, Dixit Parmar wrote:
> > Document the bindings for Infineon TLV493D Low-Power 3D Magnetic Sensor
> > controlled by I2C interface. Main applications includes joysticks, control
> > elements (white goods, multifunction knops), or electric meters (anti
> > tampering).
> 
> You are duplicating existing binding, need to remove it as well.
>
Yeah, looks like some previous stalled entry is there. I will remove it.
> > 
> > The device can be configured in to different operating modes by optional
> > device-tree "mode" property. Also, the temperature sensing part requires
> > raw offset captured at 25°C and that can be specified by "temp-offset"
> > optional device-tree property.
> > 
> > Datasheet: https://www.infineon.com/assets/row/public/documents/24/49/infineon-tlv493d-a1b6-datasheet-en.pdf
> > 
> > Signed-off-by: Dixit Parmar <dixitparmar19@...il.com>
> > ---
> >  .../iio/magnetometer/infineon,tlv493d.yaml         | 57 ++++++++++++++++++++++
> >  1 file changed, 57 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/magnetometer/infineon,tlv493d.yaml b/Documentation/devicetree/bindings/iio/magnetometer/infineon,tlv493d.yaml
> > new file mode 100644
> > index 000000000000..0442cf41503b
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/magnetometer/infineon,tlv493d.yaml
> > @@ -0,0 +1,57 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/iio/magnetometer/infineon,tlv493d.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Infineon Technologies TLV493D Low-Power 3D Magnetic Sensor
> > +
> > +maintainers:
> > +  - Dixit Parmar <dixitparmar19@...il.com>
> > +
> > +properties:
> > +  $nodename:
> > +    pattern: '^magnetometer@[0-9a-f]+$'
> > +
> > +  compatible:
> > +    const: infineon,tlv493d-a1b6
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  vdd-supply:
> > +    description: 2.8V to 3.5V supply
> > +
> > +  mode:
> > +    description: Sensor operating mode. Must be one of the defined enum values.
> 
> Why is this board level property? I imagine you want to change it runtime.
> 
Acked.
> 
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    enum:
> > +      - 0 # Power Down Mode. No measurement.
> > +      - 1 # Fast Mode
> > +      - 2 # Low-Power Mode
> > +      - 3 # Ultra Low-Power Mode
> > +      - 4 # Master Controlled Mode
> > +    default: 4
> > +
> > +  temp-offset:
> > +    description: Raw temperature offset at 25°C to apply before applying scale and correction.
> 
> Does not look wrapped according to Linux coding style.
> 
As mentioned in previous thread, the property will get removed.
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    default: 340
> 
> Missing vendor prefix, missing unit suffix. I am also not sure what is
> the board design choice to offset it.
> 
> 
> 
> > +
> > +required:
> > +  - compatible
> > +  - reg
> 
> Missing supplies.
> 
Ack.
> 
> 
> Best regards,
> Krzysztof

Thanks for the review,
Dixit