[PATCH v2 13/16] drivers: pwm: core: add push-pull mode support
flat view
STALE3187d
From: Claudiu Beznea <hidden>
Date: 2018-01-12 14:24:28
Also in:
linux-amlogic, linux-devicetree, linux-pwm, linux-rockchip, lkml
Subsystem:
pwm subsystem, the rest · Maintainers:
Uwe Kleine-König, Linus Torvalds
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 <redacted> --- 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