linux-kernel - Re: [PATCH v2 00/10] dt-bindings: iio: use spi-peripheral-props.yaml

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Message-ID: <426b98b9-95a0-eb5e-7f68-fbe1e45b4740@linaro.org>
Date:   Tue, 2 Aug 2022 10:00:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lucas Stankus <lucas.p.stankus@...il.com>,
        Puranjay Mohan <puranjay12@...il.com>,
        Cosmin Tanislav <cosmin.tanislav@...log.com>,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        Marcelo Schmitt <marcelo.schmitt1@...il.com>,
        Marcus Folkesson <marcus.folkesson@...il.com>,
        Kent Gustavsson <kent@...oris.se>,
        Tomislav Denis <tomislav.denis@....com>,
        Oleksij Rempel <linux@...pel-privat.de>, kernel@...gutronix.de,
        Antoniu Miclaus <antoniu.miclaus@...log.com>,
        Ricardo Ribalda <ribalda@...nel.org>,
        Dragos Bogdan <dragos.bogdan@...log.com>,
        Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Stefan Popa <stefan.popa@...log.com>,
        Linus Walleij <linus.walleij@...aro.org>,
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        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v2 00/10] dt-bindings: iio: use spi-peripheral-props.yaml

On 01/08/2022 18:04, Lukas Wunner wrote:
> On Mon, Aug 01, 2022 at 05:45:07PM +0200, Krzysztof Kozlowski wrote:
>> On 31/07/2022 00:46, Lukas Wunner wrote:
>>> On Wed, Jul 27, 2022 at 06:46:36PM +0200, Krzysztof Kozlowski wrote:
>>>>  78 files changed, 324 insertions(+), 249 deletions(-)
>>>
>>> Pardon me for being dense, but what is the benefit of this series
>>> that justifies inflating the schema definitions by a total of 75 lines?
>>
>> The commits were explaining rationale, so let me bring it here. The
>> benefits are:
>> This allows using all properties typical for SPI-connected devices, even
>> these which device bindings author did not tried yet.
> 
> How do you know these untested properties work with the devices to which
> you're adding them?

These properties should be device independent and instead
controller-dependent. At least some of them (that's why CPHA/CPOL was
moved away and maybe the same we need to do with spi-3wire, spi-cs-high,
spi-lsb-first).

My approach here is no different than other subsystems. Take a look at
regulator - we allow all regulator.yaml properties, even though several
are not applicable (e.g. current for voltage regulators) and for sure no
tested.

Best regards,
Krzysztof