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pwm: jz4740: Fix build failure

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When commit 9017dc4fbd59 ("pwm: jz4740: Enhance precision in calculation
of duty cycle") from v5.8-rc1 was backported to v5.4.x its dependency on
commit ce1f9cece057 ("pwm: jz4740: Use clocks from TCU driver") was not
noticed which made the pwm-jz4740 driver fail to build.

As ce1f9cece057 depends on still more rework, just backport a small part
of this commit to make the driver build again. (There is no dependency
on the functionality introduced in ce1f9cece057, just the rate variable
is needed.)

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reported-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König 2020-07-10 12:27:58 +02:00 • committed by Greg Kroah-Hartman
commit d64dc6118a
1 changed files with 3 additions and 2 deletions
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5
drivers/pwm/pwm-jz4740.c
View file

@ -92,11 +92,12 @@ static int jz4740_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
{
struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip);
unsigned long long tmp;
unsigned long period, duty;
unsigned long rate, period, duty;
unsigned int prescaler = 0;
uint16_t ctrl;
tmp = (unsigned long long)clk_get_rate(jz4740->clk) * state->period;
rate = clk_get_rate(jz4740->clk);
tmp = rate * state->period;
do_div(tmp, 1000000000);
period = tmp;