linux-kernel - [PATCH] pwm: lpc32xx

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Message-Id: <1352301955-15960-1-git-send-email-alban.bedel@avionic-design.de>
Date:	Wed,  7 Nov 2012 16:25:55 +0100
From:	Alban Bedel <alban.bedel@...onic-design.de>
To:	Thierry Reding <thierry.reding@...onic-design.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Roland Stigge <stigge@...com.de>,
	Alexandre Pereira da Silva <aletes.xgr@...il.com>,
	Alban Bedel <alban.bedel@...onic-design.de>
Subject: [PATCH] pwm: lpc32xx - Fix the PWM polarity

Signed-off-by: Alban Bedel <alban.bedel@...onic-design.de>
---
 drivers/pwm/pwm-lpc32xx.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c
index adb87f0..0dc278d 100644
--- a/drivers/pwm/pwm-lpc32xx.c
+++ b/drivers/pwm/pwm-lpc32xx.c
@@ -51,7 +51,11 @@ static int lpc32xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	c = 256 * duty_ns;
 	do_div(c, period_ns);
-	duty_cycles = c;
+	if (c == 0)
+		c = 256;
+	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));
-- 
1.7.0.4

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