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i2c: rcar: remove open coded DIV_ROUND_CLOSEST

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It improves readability if we use the available helper.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Wolfram Sang 2023-09-06 22:00:22 +02:00 committed by Wolfram Sang
parent 47280af872
commit 3c417c947c
1 changed files with 3 additions and 4 deletions
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7
drivers/i2c/busses/i2c-rcar.c
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@ -291,16 +291,15 @@ static int rcar_i2c_clock_calculate(struct rcar_i2c_priv *priv)
ick = rate / (cdf + 1);
/*
* it is impossible to calculate large scale
* number on u32. separate it
* It is impossible to calculate a large scale number on u32. Separate it.
*
* F[(ticf + tr + intd) * ick] with sum = (ticf + tr + intd)
* = F[sum * ick / 1000000000]
* = F[(ick / 1000000) * sum / 1000]
*/
sum = t.scl_fall_ns + t.scl_rise_ns + t.scl_int_delay_ns;
round = (ick + 500000) / 1000000 * sum;
round = (round + 500) / 1000;
round = DIV_ROUND_CLOSEST(ick, 1000000);
round = DIV_ROUND_CLOSEST(round * sum, 1000);
/*
* SCL = ick / (20 + 8 * SCGD + F[(ticf + tr + intd) * ick])