Messages in this thread Patch in this message | | | From | "Philip, Avinash" <> | Subject | [PATCH V2 1/2] pwm: pwm-tiecap: Add support for configuring polarity of PWM | Date | Thu, 6 Sep 2012 10:40:02 +0530 |
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ECAP APWM hardware supports polarity configuration of PWM output. This commit adds support for polarity configuration of ECAP APWM.
Signed-off-by: Philip, Avinash <avinashphilip@ti.com> --- :100644 100644 4b66889... a3d21e7... M drivers/pwm/pwm-tiecap.c drivers/pwm/pwm-tiecap.c | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c index 4b66889..a3d21e7 100644 --- a/drivers/pwm/pwm-tiecap.c +++ b/drivers/pwm/pwm-tiecap.c @@ -32,6 +32,7 @@ #define CAP3 0x10 #define CAP4 0x14 #define ECCTL2 0x2A +#define ECCTL2_APWM_POL_LOW BIT(10) #define ECCTL2_APWM_MODE BIT(9) #define ECCTL2_SYNC_SEL_DISA (BIT(7) | BIT(6)) #define ECCTL2_TSCTR_FREERUN BIT(4) @@ -111,6 +112,26 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } +static int ecap_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm, + enum pwm_polarity polarity) +{ + struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip); + unsigned short reg_val; + + pm_runtime_get_sync(pc->chip.dev); + reg_val = readw(pc->mmio_base + ECCTL2); + if (polarity == PWM_POLARITY_INVERSED) + /* Duty cycle defines LOW period of PWM */ + reg_val |= ECCTL2_APWM_POL_LOW; + else + /* Duty cycle defines HIGH period of PWM */ + reg_val &= ~ECCTL2_APWM_POL_LOW; + + writew(reg_val, pc->mmio_base + ECCTL2); + pm_runtime_put_sync(pc->chip.dev); + return 0; +} + static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip); @@ -157,6 +178,7 @@ static void ecap_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) static const struct pwm_ops ecap_pwm_ops = { .free = ecap_pwm_free, .config = ecap_pwm_config, + .set_polarity = ecap_pwm_set_polarity, .enable = ecap_pwm_enable, .disable = ecap_pwm_disable, .owner = THIS_MODULE, -- 1.7.1
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