linux-kernel - Re: [PATCH 2/2] dt-bindings: trivial-devices: Document SPI measurement on LWE boards

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Message-ID: <20250221215659.61ecc523@wsk>
Date: Fri, 21 Feb 2025 21:56:59 +0100
From: Lukasz Majewski <lukma@...x.de>
To: Conor Dooley <conor@...nel.org>
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof@...d.smtp.subspace.kernel.org,
	Kozlowski@...d.smtp.subspace.kernel.org,
	Conor Dooley <conor+dt@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Heiko Stuebner <heiko@...ech.de>, Aradhya Bhatia <a-bhatia1@...com>,
	rafal@...ecki.pl, devicetree@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>,
	Noah Wang <noahwang.wang@...look.com>, linux-kernel@...r.kernel.org,
	Peter Yin <peteryin.openbmc@...il.com>,
	Naresh Solanki <naresh.solanki@...ements.com>,
	Alex Vdovydchenko <xzeol@...oo.com>,
	Grant Peltier <grantpeltier93@...il.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH 2/2] dt-bindings: trivial-devices: Document SPI
 measurement on LWE boards

Hi Conor,

> On Fri, Feb 21, 2025 at 04:54:18PM +0100, Lukasz Majewski wrote:
> > The measurement device on Liebherr's (LWE) boards is used to monitor
> > the overall state of the device. It does have SPI interface to
> > communicate with Linux host via spidev driver. Document the SPI DT
> > binding as trivial SPI device.
> > 
> > Signed-off-by: Lukasz Majewski <lukma@...x.de>
> > ---
> >  Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml
> > b/Documentation/devicetree/bindings/trivial-devices.yaml index
> > fadbd3c041c8..5d736a9792c2 100644 ---
> > a/Documentation/devicetree/bindings/trivial-devices.yaml +++
> > b/Documentation/devicetree/bindings/trivial-devices.yaml @@ -161,6
> > +161,8 @@ properties:
> >            - jedec,spd5118
> >              # Linear Technology LTC2488
> >            - lineartechnology,ltc2488
> > +            # Liebherr on-board measurement SPI device
> > +          - lwe,btt  
> 
> How does "btt" translate to what the device actually is? Seems kinda
> random!

Btt is a family of devices (bttc, btt3, xea) - to control heavy duty
machines.

That was the original codename - conceived probably 30+ years ago.

> Also, where is patch 3, adding the lwe,btt to the spidev driver so
> that it will probe?

I've posted it to Mark Brown (and also linux-spi ML) for review.

> 
> Cheers,
> Conor.
> 
> >              # 5 Bit Programmable, Pulse-Width Modulator
> >            - maxim,ds1050
> >              # 10 kOhm digital potentiometer with I2C interface
> > -- 
> > 2.39.5
> >   




Best regards,

Lukasz Majewski

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