From b77f0370b072af3275970e0b314cc20a159ca1c1 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Mon, 12 Jan 2026 14:46:14 +0100
Subject: [PATCH] i2c: st: Use HZ_PER_GHZ constant instead of plain number

Use defined constant to avoid the possible mistakes and to provide
an additional information on the units.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260112134900.4142954-7-andriy.shevchenko@linux.intel.com
---
 drivers/i2c/busses/i2c-st.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-st.c b/drivers/i2c/busses/i2c-st.c
index 97d70e667227..751ea421caaf 100644
--- a/drivers/i2c/busses/i2c-st.c
+++ b/drivers/i2c/busses/i2c-st.c
@@ -20,6 +20,7 @@
 #include <linux/of.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
+#include <linux/units.h>
 
 /* SSC registers */
 #define SSC_BRG				0x000
@@ -285,7 +286,7 @@ static void st_i2c_hw_config(struct st_i2c_dev *i2c_dev)
 	writel_relaxed(val, i2c_dev->base + SSC_CTL);
 
 	rate = clk_get_rate(i2c_dev->clk);
-	ns_per_clk = 1000000000 / rate;
+	ns_per_clk = HZ_PER_GHZ / rate;
 
 	/* Baudrate */
 	val = rate / (2 * t->rate);
-- 
2.47.3