Commit 454870a4 authored by Philip, Avinash's avatar Philip, Avinash Committed by Thierry Reding

pwm: pwm-tiecap: Add support for configuring polarity of PWM

ECAP APWM hardware supports polarity configuration of PWM output.
This commit adds support for polarity configuration of ECAP APWM.
Signed-off-by: default avatarPhilip, Avinash <avinashphilip@ti.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
parent 6354316d
...@@ -32,6 +32,7 @@ ...@@ -32,6 +32,7 @@
#define CAP3 0x10 #define CAP3 0x10
#define CAP4 0x14 #define CAP4 0x14
#define ECCTL2 0x2A #define ECCTL2 0x2A
#define ECCTL2_APWM_POL_LOW BIT(10)
#define ECCTL2_APWM_MODE BIT(9) #define ECCTL2_APWM_MODE BIT(9)
#define ECCTL2_SYNC_SEL_DISA (BIT(7) | BIT(6)) #define ECCTL2_SYNC_SEL_DISA (BIT(7) | BIT(6))
#define ECCTL2_TSCTR_FREERUN BIT(4) #define ECCTL2_TSCTR_FREERUN BIT(4)
...@@ -111,6 +112,26 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, ...@@ -111,6 +112,26 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
return 0; 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) static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{ {
struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip); 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) ...@@ -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 = { static const struct pwm_ops ecap_pwm_ops = {
.free = ecap_pwm_free, .free = ecap_pwm_free,
.config = ecap_pwm_config, .config = ecap_pwm_config,
.set_polarity = ecap_pwm_set_polarity,
.enable = ecap_pwm_enable, .enable = ecap_pwm_enable,
.disable = ecap_pwm_disable, .disable = ecap_pwm_disable,
.owner = THIS_MODULE, .owner = THIS_MODULE,
......
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