diff options
Diffstat (limited to 'drivers/pwm/pwm-lpc32xx.c')
| -rw-r--r-- | drivers/pwm/pwm-lpc32xx.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c index 015a8223562..14106440294 100644 --- a/drivers/pwm/pwm-lpc32xx.c +++ b/drivers/pwm/pwm-lpc32xx.c @@ -49,9 +49,24 @@ static int lpc32xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, c = 0; /* 0 set division by 256 */ period_cycles = c; + /* The duty-cycle value is as follows: + * + * DUTY-CYCLE HIGH LEVEL + * 1 99.9% + * 25 90.0% + * 128 50.0% + * 220 10.0% + * 255 0.1% + * 0 0.0% + * + * In other words, the register value is duty-cycle % 256 with + * duty-cycle in the range 1-256. + */ c = 256 * duty_ns; do_div(c, period_ns); - duty_cycles = c; + if (c > 255) + c = 255; + duty_cycles = 256 - c; writel(PWM_ENABLE | PWM_RELOADV(period_cycles) | PWM_DUTY(duty_cycles), lpc32xx->base + (pwm->hwpwm << 2)); @@ -106,6 +121,7 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev) lpc32xx->chip.dev = &pdev->dev; lpc32xx->chip.ops = &lpc32xx_pwm_ops; lpc32xx->chip.npwm = 2; + lpc32xx->chip.base = -1; ret = pwmchip_add(&lpc32xx->chip); if (ret < 0) { @@ -121,8 +137,11 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev) static int lpc32xx_pwm_remove(struct platform_device *pdev) { struct lpc32xx_pwm_chip *lpc32xx = platform_get_drvdata(pdev); + unsigned int i; + + for (i = 0; i < lpc32xx->chip.npwm; i++) + pwm_disable(&lpc32xx->chip.pwms[i]); - clk_disable(lpc32xx->clk); return pwmchip_remove(&lpc32xx->chip); } |