linux-kernel - [PATCH v1 2/6] units: Add value of π * 10⁹

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Message-ID: <20251027143850.2070427-3-andriy.shevchenko@linux.intel.com>
Date: Mon, 27 Oct 2025 15:34:51 +0100
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-iio@...r.kernel.org,
	chrome-platform@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Cc: Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	Benson Leung <bleung@...omium.org>,
	Guenter Roeck <groeck@...omium.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	"Daniel W. S. Almeida" <dwlsalmeida@...il.com>
Subject: [PATCH v1 2/6] units: Add value of π * 10⁹

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.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/units.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/units.h b/include/linux/units.h
index f626e212d4ca..82bdc2041328 100644
--- a/include/linux/units.h
+++ b/include/linux/units.h
@@ -21,6 +21,9 @@
 #define PICO	1000000000000ULL
 #define FEMTO	1000000000000000ULL
 
+/* Value of π * 10⁹ */
+#define PI	3141592653LL
+
 /* Hz based multipliers */
 #define NANOHZ_PER_HZ		1000000000UL
 #define MICROHZ_PER_HZ		1000000UL
-- 
2.50.1