linux-kernel - [PATCH v2 13/16] drivers: pwm: core: add push-pull mode support

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Message-ID: <1515766983-15151-14-git-send-email-claudiu.beznea@microchip.com>
Date:   Fri, 12 Jan 2018 16:23:00 +0200
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <thierry.reding@...il.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <linux@...linux.org.uk>,
        <daniel@...que.org>, <haojian.zhuang@...il.com>,
        <robert.jarzmik@...e.fr>, <corbet@....net>,
        <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...e-electrons.com>
CC:     <linux-pwm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>,
        <linux-rpi-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH v2 13/16] drivers: pwm: core: add push-pull mode support

Add push-pull mode support in PWM code. In push-pull mode the channels
outputs has same polarity and the edges are complementary delayed for one
period.

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/pwm/sysfs.c | 2 ++
 include/linux/pwm.h | 9 +++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
index 7d111ab17e43..5052bdec7ad6 100644
--- a/drivers/pwm/sysfs.c
+++ b/drivers/pwm/sysfs.c
@@ -249,6 +249,8 @@ static ssize_t mode_store(struct device *child,
 		mode = PWM_MODE_NORMAL;
 	else if (sysfs_streq(buf, pwm_get_mode_desc(PWM_MODE_COMPLEMENTARY)))
 		mode = PWM_MODE_COMPLEMENTARY;
+	else if (sysfs_streq(buf, pwm_get_mode_desc(PWM_MODE_PUSH_PULL)))
+		mode = PWM_MODE_PUSH_PULL;
 	else
 		return -EINVAL;
 
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 2e8dfc3ea516..a4ad3b7a5317 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -29,13 +29,16 @@ enum pwm_polarity {
  * enum pwm_mode - PWM working modes
  * PWM_MODE_NORMAL: PWM has one output per channel
  * PWM_MODE_COMPLEMENTARY: PWM has 2 outputs per channel with opposite polarity
+ * PWM_MODE_PUSH_PULL: PWM has 2 outputs per channel with same polarity and
+ * the edges are complementary delayed for one period
  * PWM_MODE_MAX: Used to get the defined PWM modes mask (PWM_MODE_MAX - 1)
  * phase-shifted
  */
 enum pwm_mode {
 	PWM_MODE_NORMAL		= BIT(0),
 	PWM_MODE_COMPLEMENTARY	= BIT(1),
-	PWM_MODE_MAX		= BIT(2),
+	PWM_MODE_PUSH_PULL	= BIT(2),
+	PWM_MODE_MAX		= BIT(3),
 };
 
 /**
@@ -478,7 +481,9 @@ static inline void pwm_disable(struct pwm_device *pwm)
 
 static inline const char * const pwm_get_mode_desc(enum pwm_mode mode)
 {
-	static const char * const modes[] = { "normal", "complementary" };
+	static const char * const modes[] = {
+		"normal", "complementary", "push-pull"
+	};
 
 	return mode ? modes[ffs(mode) - 1] : "invalid";
 }
-- 
2.7.4