diff options
| author | Stefan Wahren <stefan.wahren@i2se.com> | 2015-12-01 22:55:39 +0000 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2015-12-16 16:44:36 +0100 |
| commit | ebe88b6ae41ff8f2b48608b6019c4341aa24bcea (patch) | |
| tree | 33c3e4590e449e3988d58d6d426853fdf920d72d /drivers/pwm/pwm-bcm2835.c | |
| parent | c7b91b33cf446ec09eedf4594cff8d7b85ef6870 (diff) | |
| download | linux-ebe88b6ae41ff8f2b48608b6019c4341aa24bcea.tar.bz2 | |
pwm: bcm2835: Calculate scaler in ->config()
Currently pwm-bcm2835 assumes a fixed clock rate and stores the
resulting scaler in the driver structure. But with the upcoming
PWM clock support for clk-bcm2835 the rate could change, so
calculate the scaler in the ->config() callback.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/pwm-bcm2835.c')
| -rw-r--r-- | drivers/pwm/pwm-bcm2835.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c index b4c7f956b6fa..174cca92f690 100644 --- a/drivers/pwm/pwm-bcm2835.c +++ b/drivers/pwm/pwm-bcm2835.c @@ -29,7 +29,6 @@ struct bcm2835_pwm { struct pwm_chip chip; struct device *dev; - unsigned long scaler; void __iomem *base; struct clk *clk; }; @@ -66,6 +65,7 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct bcm2835_pwm *pc = to_bcm2835_pwm(chip); + unsigned long scaler = NSEC_PER_SEC / clk_get_rate(pc->clk); if (period_ns <= MIN_PERIOD) { dev_err(pc->dev, "period %d not supported, minimum %d\n", @@ -73,8 +73,8 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, return -EINVAL; } - writel(duty_ns / pc->scaler, pc->base + DUTY(pwm->hwpwm)); - writel(period_ns / pc->scaler, pc->base + PERIOD(pwm->hwpwm)); + writel(duty_ns / scaler, pc->base + DUTY(pwm->hwpwm)); + writel(period_ns / scaler, pc->base + PERIOD(pwm->hwpwm)); return 0; } @@ -156,8 +156,6 @@ static int bcm2835_pwm_probe(struct platform_device *pdev) if (ret) return ret; - pc->scaler = NSEC_PER_SEC / clk_get_rate(pc->clk); - pc->chip.dev = &pdev->dev; pc->chip.ops = &bcm2835_pwm_ops; pc->chip.npwm = 2; |