linux-kernel - Re: [PATCH v3 5/7] iio: accel: kionix-kx022a: Refactor driver and add chip

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Date:   Sun, 30 Apr 2023 18:49:10 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Mehdi Djait <mehdi.djait.k@...il.com>
Cc:     Andi Shyti <andi.shyti@...nel.org>, mazziesaccount@...il.com,
        krzysztof.kozlowski+dt@...aro.org,
        andriy.shevchenko@...ux.intel.com, robh+dt@...nel.org,
        lars@...afoo.de, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 5/7] iio: accel: kionix-kx022a: Refactor driver and
 add chip_info structure

On Sat, 29 Apr 2023 15:07:46 +0200
Mehdi Djait <mehdi.djait.k@...il.com> wrote:

> Hi Andi,
> 
> Thank you for the review.
> 
> On Tue, Apr 25, 2023 at 05:57:34PM +0200, Andi Shyti wrote:
> > Hi Mehdi,
> > 
> > On Tue, Apr 25, 2023 at 12:22:25AM +0200, Mehdi Djait wrote:  
> > > Add the chip_info structure to the driver's private data to hold all
> > > the device specific infos.
> > > Refactor the kx022a driver implementation to make it more generic and
> > > extensible.  
> > 
> > Could you please split this in different patches? Add id in one
> > patch and refactor in a different patch. Please, also the
> > refactorings need to be split.
> > 
> > I see here that this is a general code cleanup, plus some other
> > stuff.  
> 
> Looking at the diff and considering the comments from Jonathan in the
> previous versions, the only thing that can separated from this patch
> would be the changes related to:
> -#define KX022A_ACCEL_CHAN(axis, index)				\
> +#define KX022A_ACCEL_CHAN(axis, reg, index)			\
> 
> > 
> > [...]
> >   
> > > @@ -22,22 +23,28 @@ static int kx022a_spi_probe(struct spi_device *spi)
> > >  		return -EINVAL;
> > >  	}
> > >  
> > > -	regmap = devm_regmap_init_spi(spi, &kx022a_regmap);
> > > +	chip_info = device_get_match_data(&spi->dev);
> > > +	if (!chip_info) {
> > > +		const struct spi_device_id *id = spi_get_device_id(spi);
> > > +		chip_info = (const struct kx022a_chip_info *)id->driver_data;  
> > 
> > you don't need the cast here... if you don't find it messy, I
> > wouldn't mind this form... some hate it, I find it easier to
> > read:
> > 
> > 	chip_info = spi_get_device_id(spi)->driver_data;
> > 
> > your choice.  
> 
> I don't really have any strong opinion about this other than keeping the
> same style used in iio drivers
> 
> Again thank you for the review

I'm fairly sure the cast is needed because driver_data is (via defines)
an unsigned long, which you cannot implicitly cast to a pointer without
various warnings being generated.

Jonathan

> 
> --
> Kind Regards
> Mehdi Djait
>