Commit acfd92fd authored by Sylvain Lemieux's avatar Sylvain Lemieux Committed by Thierry Reding

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 08ee77b5,
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.pdfSigned-off-by: default avatarSylvain Lemieux <slemieux@tycoint.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent ef1f09ec
...@@ -25,6 +25,7 @@ struct lpc32xx_pwm_chip { ...@@ -25,6 +25,7 @@ struct lpc32xx_pwm_chip {
}; };
#define PWM_ENABLE BIT(31) #define PWM_ENABLE BIT(31)
#define PWM_PIN_LEVEL BIT(30)
#define to_lpc32xx_pwm_chip(_chip) \ #define to_lpc32xx_pwm_chip(_chip) \
container_of(_chip, struct 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) ...@@ -103,6 +104,7 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev)
struct lpc32xx_pwm_chip *lpc32xx; struct lpc32xx_pwm_chip *lpc32xx;
struct resource *res; struct resource *res;
int ret; int ret;
u32 val;
lpc32xx = devm_kzalloc(&pdev->dev, sizeof(*lpc32xx), GFP_KERNEL); lpc32xx = devm_kzalloc(&pdev->dev, sizeof(*lpc32xx), GFP_KERNEL);
if (!lpc32xx) if (!lpc32xx)
...@@ -128,6 +130,11 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev) ...@@ -128,6 +130,11 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev)
return ret; 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); platform_set_drvdata(pdev, lpc32xx);
return 0; return 0;
......
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