linux-kernel - Re: [PATCH 2/4] iio: adc: Add support for the Renesas RZ/N1 ADC

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Message-ID: <CAMuHMdV0As4XKG0P0y+pJpTT82Bq8qpq2rHufeX4_q0j-eOPPA@mail.gmail.com>
Date: Fri, 17 Oct 2025 09:40:42 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>, Jonathan Cameron <jic23@...nel.org>, 
	David Lechner <dlechner@...libre.com>, Nuno Sá <nuno.sa@...log.com>, 
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Magnus Damm <magnus.damm@...il.com>, 
	Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, linux-iio@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Pascal Eberhard <pascal.eberhard@...com>, 
	Miquel Raynal <miquel.raynal@...tlin.com>, Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 2/4] iio: adc: Add support for the Renesas RZ/N1 ADC

Hi Hervé,

On Fri, 17 Oct 2025 at 09:37, Herve Codina <herve.codina@...tlin.com> wrote:
> Wolfram Sang <wsa+renesas@...g-engineering.com> wrote:
> > On Wed, Oct 15, 2025 at 04:28:14PM +0200, Herve Codina (Schneider Electric) wrote:
> > > +static void rzn1_adc_vc_setup_conversion(struct rzn1_adc *rzn1_adc, u32 ch,
> > > +                                    int adc1_ch, int adc2_ch)
> > > +{
> > > +   u32 vc = 0;
> > > +
> > > +   if (adc1_ch != -1)
> > > +           vc |= RZN1_ADC_VC_ADC1_ENABLE | RZN1_ADC_VC_ADC1_CHANNEL_SEL(adc1_ch);
> > > +
> > > +   if (adc2_ch != -1)
> > > +           vc |= RZN1_ADC_VC_ADC2_ENABLE | RZN1_ADC_VC_ADC2_CHANNEL_SEL(adc2_ch);
> >
> > Are you open to either use an errno (maybe EACCES) or define something
> > custom (maybe RZN1_ADC_NO_CHANNEL) instead of hardcoded -1? I think I
> > like the latter a tad more.
>
> I prefer RZN1_ADC_NO_CHANNEL too instead of an error code and I will use
> that instead of -1 in the next iteration.

Or just -ENODEV or -ENOENT, and change the checks above to
"if (adc1_ch >= 0)"?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds