From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: David Lechner <dlechner@baylibre.com>
Cc: "Jonathan Cameron" <jic23@kernel.org>,
linux-iio@vger.kernel.org, chrome-platform@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
"Nuno Sá" <nuno.sa@analog.com>,
"Andy Shevchenko" <andy@kernel.org>,
"Benson Leung" <bleung@chromium.org>,
"Guenter Roeck" <groeck@chromium.org>,
"Lars-Peter Clausen" <lars@metafoo.de>,
"Michael Hennerich" <Michael.Hennerich@analog.com>,
"Mauro Carvalho Chehab" <mchehab@kernel.org>,
"Daniel W. S. Almeida" <dwlsalmeida@gmail.com>
Subject: Re: [PATCH v1 2/6] units: Add value of π * 10⁹
Date: Tue, 28 Oct 2025 10:09:09 +0200 [thread overview]
Message-ID: <aQB6JdePRUuegGxn@smile.fi.intel.com> (raw)
In-Reply-To: <66c8f410-6bba-41d2-88e2-46dbe133adaa@baylibre.com>
On Mon, Oct 27, 2025 at 09:59:10AM -0500, David Lechner wrote:
> On 10/27/25 9:52 AM, Jonathan Cameron wrote:
> > On Mon, 27 Oct 2025 15:34:51 +0100
> > Andy Shevchenko <andriy.shevchenko@linux.intel.com> wrote:
> >
> >> There are a few drivers that want to have this value, and at least one
> >> known to come soon. Let's define a value for them.
> >
> > Is there any way we can make the x10^9 bit obvious in the naming? Or do
> > something a bit nasty like defining a macro along the lines of
> >
> > PI(scale)?
> > e.g. PI(NANO), PI(10000)
> >
> This was my first thought when looking at this as well.
>
> Or something like PI_x10(6).
We need a good macro that may _at compile-time_ convert 64-bit input to 32-bit
value that may be suitable for 32-bit arithmetics / architectures.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2025-10-28 8:09 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-27 14:34 [PATCH v1 0/6] iio: Introduce and use value of π Andy Shevchenko
2025-10-27 14:34 ` [PATCH v1 1/6] media: vidtv: Rename PI definition to PI_SAMPLES Andy Shevchenko
2025-10-30 7:24 ` Hans Verkuil
2025-10-27 14:34 ` [PATCH v1 2/6] units: Add value of π * 10⁹ Andy Shevchenko
2025-10-27 14:52 ` Jonathan Cameron
2025-10-27 14:59 ` David Lechner
2025-10-28 8:09 ` Andy Shevchenko [this message]
2025-10-27 19:30 ` David Laight
2025-10-28 8:08 ` Andy Shevchenko
2025-10-28 9:27 ` David Laight
2025-10-27 14:34 ` [PATCH v1 3/6] media: dvb-frontends: atbm8830: Convert to use PI definition Andy Shevchenko
2025-10-30 7:26 ` Hans Verkuil
2025-10-27 14:34 ` [PATCH v1 4/6] iio: cros_ec_sensors: " Andy Shevchenko
2025-10-27 14:34 ` [PATCH v1 5/6] iio: frequency: ad9523: " Andy Shevchenko
2025-10-27 14:34 ` [PATCH v1 6/6] iio: position: iqs624-pos: " Andy Shevchenko
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