From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Hans Verkuil <hverkuil+cisco@kernel.org>,
linux-iio@vger.kernel.org, chrome-platform@lists.linux.dev,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org
Cc: "Jonathan Cameron" <jic23@kernel.org>,
"David Lechner" <dlechner@baylibre.com>,
"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: [PATCH v2 2/6] units: Add 32- and 64-bit signed values of π
Date: Fri, 7 Nov 2025 21:03:00 +0100 [thread overview]
Message-ID: <20251107201005.3156118-3-andriy.shevchenko@linux.intel.com> (raw)
In-Reply-To: <20251107201005.3156118-1-andriy.shevchenko@linux.intel.com>
There are a few drivers that want to have these values, and
one more known to come soon. Let's define the values for them.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
include/linux/units.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/include/linux/units.h b/include/linux/units.h
index f626e212d4ca..5b3293bce04c 100644
--- a/include/linux/units.h
+++ b/include/linux/units.h
@@ -21,6 +21,12 @@
#define PICO 1000000000000ULL
#define FEMTO 1000000000000000ULL
+/* Value of π * 10⁸ (fits s32 or signed int) */
+#define PI 314159265
+
+/* Value of π * 10¹⁸ (fits s64 or signed long long) */
+#define PI_LL 3141592653589793238LL
+
/* Hz based multipliers */
#define NANOHZ_PER_HZ 1000000000UL
#define MICROHZ_PER_HZ 1000000UL
--
2.50.1
next prev parent reply other threads:[~2025-11-07 20:10 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-07 20:02 [PATCH v2 0/6] iio: Introduce and use value of π Andy Shevchenko
2025-11-07 20:02 ` [PATCH v2 1/6] media: vidtv: Rename PI definition to PI_SAMPLES Andy Shevchenko
2025-11-07 20:03 ` Andy Shevchenko [this message]
2025-11-07 21:09 ` [PATCH v2 2/6] units: Add 32- and 64-bit signed values of π David Lechner
2025-11-07 21:14 ` David Lechner
[not found] ` <CAHp75VexvdYyjt1GkbfqOotkFpLeb=io6outJ5dpRqBv2qPNng@mail.gmail.com>
2025-11-09 17:00 ` Jonathan Cameron
2025-11-09 17:09 ` Andy Shevchenko
2025-11-07 20:03 ` [PATCH v2 3/6] media: dvb-frontends: atbm8830: Convert to use PI definition Andy Shevchenko
2025-11-07 20:03 ` [PATCH v2 4/6] iio: cros_ec_sensors: " Andy Shevchenko
2025-11-07 20:03 ` [PATCH v2 5/6] iio: frequency: ad9523: " Andy Shevchenko
2025-11-07 20:03 ` [PATCH v2 6/6] iio: position: iqs624-pos: " Andy Shevchenko
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