i2c: nomadik: 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.

While at it, drop unneeded 64-bit division, all operands fit 32-bit.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
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/20260112134900.4142954-5-andriy.shevchenko@linux.intel.com

diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index 19b648fc094d9748a0cce4e35f350da35ee25505..b63ee51c1652080e414f4302bee16905914c1288 100644 (file)
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -31,6 +31,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
+#include <linux/units.h>
 
 #define DRIVER_NAME "nmk-i2c"
 
@@ -419,10 +420,10 @@ static void setup_i2c_controller(struct nmk_i2c_dev *priv)
         * modes are 250ns, 100ns, 10ns respectively.
         *
         * As the time for one cycle T in nanoseconds is
-        * T = (1/f) * 1000000000 =>
-        * slsu = cycles / (1000000000 / f) + 1
+        * T = (1/f) * HZ_PER_GHZ =>
+        * slsu = cycles / (HZ_PER_GHZ / f) + 1
         */
-       ns = DIV_ROUND_UP_ULL(1000000000ULL, i2c_clk);
+       ns = DIV_ROUND_UP(HZ_PER_GHZ, i2c_clk);
        switch (priv->sm) {
        case I2C_FREQ_MODE_FAST:
        case I2C_FREQ_MODE_FAST_PLUS: