mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
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 08ee77b5a5
,
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>
This commit is contained in:
parent
ef1f09eca7
commit
acfd92fdfb
@ -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;
|
||||
|
Loading…
Reference in New Issue
Block a user