linux-kernel - Re: [PATCH v3 3/7] iio: adc: add RZ/T2H / RZ/N2H ADC driver

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Message-ID: <CAMuHMdV+V60pZSRmu6SjeBNyi_0+Un5pXjWDLDDBt6UbYfTmeQ@mail.gmail.com>
Date: Sat, 4 Oct 2025 16:33:05 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Jonathan Cameron <jic23@...nel.org>
Cc: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>, 
	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>, 
	linux-iio@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/7] iio: adc: add RZ/T2H / RZ/N2H ADC driver

On Sat, 4 Oct 2025 at 15:39, Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Wed,  1 Oct 2025 15:23:10 +0300
> Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com> wrote:
>
> > Add support for the A/D 12-Bit successive approximation converters found
> > in the Renesas RZ/T2H (R9A09G077) and RZ/N2H (R9A09G087) SoCs.
> >
> > RZ/T2H has two ADCs with 4 channels and one with 6.
> > RZ/N2H has two ADCs with 4 channels and one with 15.
> >
> > Conversions can be performed in single or continuous mode. Result of the
> > conversion is stored in a 16-bit data register corresponding to each
> > channel.
> >
> > The conversions can be started by a software trigger, a synchronous
> > trigger (from MTU or from ELC) or an asynchronous external trigger (from
> > ADTRGn# pin).
> >
> > Only single mode with software trigger is supported for now.
> >
> > Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
> > Reviewed-by: Nuno Sá <nuno.sa@...log.com>
> Hi Cosmin
>
> A few really minor comments.
>
> I might have ignored these or tweaked whilst applying but looks
> like you'll probably be doing a v4 anyway so I thought I'd mention them.
>
> Thanks,
>
> Jonathan
>
>
> > diff --git a/drivers/iio/adc/rzt2h_adc.c b/drivers/iio/adc/rzt2h_adc.c
> > new file mode 100644
> > index 000000000000..51d1852d814d
> > --- /dev/null
> > +++ b/drivers/iio/adc/rzt2h_adc.c
> > @@ -0,0 +1,309 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +#include <linux/bitfield.h>
> > +#include <linux/cleanup.h>
> > +#include <linux/completion.h>
> > +#include <linux/delay.h>
> > +#include <linux/iio/adc-helpers.h>
> > +#include <linux/iio/iio.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/io.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/mod_devicetable.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/property.h>
> > +
> > +#define RZT2H_NAME                   "rzt2h-adc"
>
> I'm not a huge fan of defines like this as there is no inherent reason the two
> places it is used should take the same value. If you feel it's really justified
> then I don't mind too much though.

I am not a fan either, as using a define in the initialization of
platform_driver.driver.name means I have to do another grep to
find the actual name.

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