linux-kernel - Re: [PATCH 1/4] iio: adc: rcar-gyroadc: mark OF related data as maybe unused

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Date:   Sat, 11 Mar 2023 18:47:52 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Marek Vasut <marek.vasut@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Robert Eshleman <bobbyeshleman@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] iio: adc: rcar-gyroadc: mark OF related data as
 maybe unused

On Sat, 11 Mar 2023 13:26:12 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 11/03/2023 13:23, Jonathan Cameron wrote:
> > On Sat, 11 Mar 2023 12:14:54 +0100
> > Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> >   
> >> The driver can be compile tested with !CONFIG_OF making certain data
> >> unused:
> >>
> >>   drivers/iio/adc/rcar-gyroadc.c:286:34: error: ‘rcar_gyroadc_child_match’ defined but not used [-Werror=unused-const-variable=]
> >>
> >> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>  
> > 
> > Whilst in general I'd prefer to see these converted to generic fw properties, this
> > one is not trivial. So applied to the togreg branch of iio.git.
> > 
> > It would be nice if anyone has time to circle back to this and get rid of
> > the of specific stuff.  
> 
> This is device ID table. What do you want to remove here? What OF part?

All of it (well not the table, but the code that directly accesses the
table).  As a general rule I'd like to see all driver in IIO
using the generic firmware accessors in property.h so that they work
with PRP0001 and other firmware types (see reply to later patch)

It's understandable that a given driver is only used on dt based
platforms, but that doesn't mean I wouldn't prefer generic code
if we can do it easily.  It becomes easier to review and better as a source
of code that might get copied into future drivers.

Jonathan

> 
> Best regards,
> Krzysztof
>