diff options
| author | Mark Brown <broonie@kernel.org> | 2016-02-09 18:20:39 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-02-09 18:20:39 +0000 |
| commit | fcdcc79628a1919bde9acf239e364f65bab6327c (patch) | |
| tree | 5499be387cf3028c90ac083b1cf866ebed7bf7e0 /drivers/pwm/pwm-bcm2835.c | |
| parent | 7a8d44bc89e5cddcd5c0704a11a90484d36ba6ba (diff) | |
| parent | a0a90718f18264dc904d34a580f332006f5561e9 (diff) | |
Merge branch 'topic/acpi' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-pxa2xx
Diffstat (limited to 'drivers/pwm/pwm-bcm2835.c')
| -rw-r--r-- | drivers/pwm/pwm-bcm2835.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c index b4c7f956b6fa..c5dbf16d810b 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 +65,15 @@ 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 rate = clk_get_rate(pc->clk); + unsigned long scaler; + + if (!rate) { + dev_err(pc->dev, "failed to get clock rate\n"); + return -EINVAL; + } + + scaler = NSEC_PER_SEC / rate; if (period_ns <= MIN_PERIOD) { dev_err(pc->dev, "period %d not supported, minimum %d\n", @@ -73,8 +81,8 @@ 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 +164,6 @@ 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; @@ -200,6 +206,6 @@ static struct platform_driver bcm2835_pwm_driver = { }; module_platform_driver(bcm2835_pwm_driver); -MODULE_AUTHOR("Bart Tanghe <bart.tanghe@thomasmore.be"); +MODULE_AUTHOR("Bart Tanghe <bart.tanghe@thomasmore.be>"); MODULE_DESCRIPTION("Broadcom BCM2835 PWM driver"); MODULE_LICENSE("GPL v2"); |