diff options
| author | Sylvain Lemieux <slemieux@tycoint.com> | 2016-06-27 16:09:55 +0300 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2016-07-11 13:49:29 +0300 |
| commit | acfd92fdfb9384d54d9404101e8657e75c2372f3 (patch) | |
| tree | da50555ec0c69fb074c7f8965b23d4b4bbf7a08f /drivers/pwm | |
| parent | ef1f09eca74a42d39ce81adec444743a6ff018aa (diff) | |
| download | linux-acfd92fdfb9384d54d9404101e8657e75c2372f3.tar.xz | |
pwm: lpc32xx: Set PWM_PIN_LEVEL bit to default value
The PWM_PIN_LEVEL bit is leave unset by the kernel PWM driver.
Prior to commit 08ee77b5a5de27ad63c92262ebcb4efe0da93b58,
the PWM_PIN_LEVEL bit was always clear when the PWM was disable
and a 0 logic level was apply to the output.
According to the LPC32x0 User Manual [1],
the default value for bit 30 (PWM_PIN_LEVEL) is 0.
This change initialize the pin level to 0 (default value) and
update the register value accordingly.
[1] http://www.nxp.com/documents/user_manual/UM10326.pdf
Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-lpc32xx.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c index 4d470c1a406a..a9b3cff96aac 100644 --- a/drivers/pwm/pwm-lpc32xx.c +++ b/drivers/pwm/pwm-lpc32xx.c @@ -25,6 +25,7 @@ struct lpc32xx_pwm_chip { }; #define PWM_ENABLE BIT(31) +#define PWM_PIN_LEVEL BIT(30) #define to_lpc32xx_pwm_chip(_chip) \ container_of(_chip, struct lpc32xx_pwm_chip, chip) @@ -103,6 +104,7 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev) struct lpc32xx_pwm_chip *lpc32xx; struct resource *res; int ret; + u32 val; lpc32xx = devm_kzalloc(&pdev->dev, sizeof(*lpc32xx), GFP_KERNEL); if (!lpc32xx) @@ -128,6 +130,11 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev) return ret; } + /* When PWM is disable, configure the output to the default value */ + val = readl(lpc32xx->base + (lpc32xx->chip.pwms[0].hwpwm << 2)); + val &= ~PWM_PIN_LEVEL; + writel(val, lpc32xx->base + (lpc32xx->chip.pwms[0].hwpwm << 2)); + platform_set_drvdata(pdev, lpc32xx); return 0; |