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pwm: rcar: Simplify multiplication/shift logic

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- Remove the superfluous cast; the multiplication will yield a 64-bit
    result due to the "100ULL" anyway,
  - "a * (1 << b)" == "a << b".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Geert Uytterhoeven 2022-02-21 17:28:16 +01:00 committed by Thierry Reding
parent f4866732a7
commit ed14d36498
1 changed files with 1 additions and 1 deletions
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2
drivers/pwm/pwm-rcar.c
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@ -110,7 +110,7 @@ static int rcar_pwm_set_counter(struct rcar_pwm_chip *rp, int div, int duty_ns,
unsigned long clk_rate = clk_get_rate(rp->clk);
u32 cyc, ph;
one_cycle = (unsigned long long)NSEC_PER_SEC * 100ULL * (1 << div);
one_cycle = NSEC_PER_SEC * 100ULL << div;
do_div(one_cycle, clk_rate);
tmp = period_ns * 100ULL;