linux-kernel - Re: [PATCH v2 2/3] dt-bindings: iio: io-channel-mux: Add property for settle time

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Date:   Fri, 8 Oct 2021 15:56:10 +0200
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     Rob Herring <robh@...nel.org>
CC:     kernel <kernel@...s.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "peda@...ntia.se" <peda@...ntia.se>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] dt-bindings: iio: io-channel-mux: Add property
 for settle time

On Fri, Oct 08, 2021 at 04:46:12AM +0200, Rob Herring wrote:
> On Thu, 07 Oct 2021 15:46:40 +0200, Vincent Whitchurch wrote:
> > Hardware may require some time for the muxed analog signals to settle
> > after the muxing is changed.  Allow this time to be specified in the
> > devicetree.
> > 
> > Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> > ---
> >  .../devicetree/bindings/iio/multiplexer/io-channel-mux.yaml  | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> 
> Running 'make dtbs_check' with the schema in this patch gives the
> following warnings. Consider if they are expected or the schema is
> incorrect. These may not be new warnings.

Yes, these are not new warnings.

> Note that it is not yet a requirement to have 0 warnings for dtbs_check.
> This will change in the future.
> 
> Full log is available here: https://patchwork.ozlabs.org/patch/1537724
> 
> 
> adc0mux: '#io-channel-cells' does not match any of the regexes: 'pinctrl-[0-9]+'
> 	arch/arm/boot/dts/aspeed-bmc-ampere-mtjade.dt.yaml
> 
> adc10mux: '#io-channel-cells' does not match any of the regexes: 'pinctrl-[0-9]+'
> 	arch/arm/boot/dts/aspeed-bmc-ampere-mtjade.dt.yaml
[...]

I think the fix for these is to add a "#io-channel-cells": const 1 to
the schema.

> envelope-detector-mux: channels: ['', '', 'sync-1', 'in', 'out', 'sync-2', 'sys-reg', 'ana-reg'] has non-unique elements
> 	arch/arm/boot/dts/at91-tse850-3.dt.yaml

This one looks like an error in that particular devicetree.