linux-kernel - RE: [PATCH] iio: magnetometer: ak8975: Fix 'Unexpected device' error

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Date:   Mon, 2 Oct 2023 09:57:09 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        André Apitzsch <git@...tzsch.eu>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] iio: magnetometer: ak8975: Fix 'Unexpected device' error

> Subject: Re: [PATCH] iio: magnetometer: ak8975: Fix 'Unexpected device'
> error
> 
> On Mon, Oct 02, 2023 at 09:38:17AM +0000, Biju Das wrote:
> > > On Mon, Oct 02, 2023 at 10:27:45AM +0100, Jonathan Cameron wrote:
> > > > On Sun, 1 Oct 2023 18:09:56 +0200
> > > > André Apitzsch <git@...tzsch.eu> wrote:
> > >
> > > > > Fixes: 4f9ea93afde1 ("iio: magnetometer: ak8975: Convert
> > > > > enum->pointer for data in the match tables")
> > >
> > > ^^^ (1)
> 
> ...
> 
> > > > So we need the spacer until someone converts this driver to use
> > > > pointers instead for both of and ACPI tables.
> > >
> > > Isn't it done by (1) which is in your tree?
> >
> > How (1) can trigger 'Unexpected device' error??
> > It returns match_data, and match_data has correct device type.
> 
> How? The enum starts from 0 with a AKXXXX and ak_def_array starts from 0
> indexing, it's classical off-by-one, you got the driver data for a wrong
> chip.

Got it. I was about to reply. It just needs mapping as Andre did here.

Cheers,
Biju