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Subject[PATCH v8 6/6] pwm: atmel: add push-pull mode support
Date
From: Claudiu Beznea <claudiu.beznea@microchip.com>

Add support for PWM push-pull mode. This is only supported by SAMA5D2 SoCs.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
drivers/pwm/pwm-atmel.c | 40 ++++++++++++++++++++++++++++++++++++----
1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index b72cacd5dca3..650d475a4c34 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -33,8 +33,11 @@

#define PWM_CMR 0x0
/* Bit field in CMR */
-#define PWM_CMR_CPOL (1 << 9)
-#define PWM_CMR_UPD_CDTY (1 << 10)
+#define PWM_CMR_CPOL BIT(9)
+#define PWM_CMR_UPD_CDTY BIT(10)
+#define PWM_CMR_DTHI BIT(17)
+#define PWM_CMR_DTLI BIT(18)
+#define PWM_CMR_PPM BIT(19)
#define PWM_CMR_CPRE_MSK 0xF

/* The following registers for PWM v1 */
@@ -219,16 +222,19 @@ static int atmel_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
{
struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip);
struct pwm_state cstate;
+ struct pwm_caps caps;
unsigned long cprd, cdty;
u32 pres, val;
int ret;

pwm_get_state(pwm, &cstate);
+ pwm_get_caps(pwm, &caps);

if (state->enabled) {
if (cstate.enabled &&
cstate.polarity == state->polarity &&
- cstate.period == state->period) {
+ cstate.period == state->period &&
+ cstate.modebit == state->modebit) {
cprd = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm,
atmel_pwm->data->regs.period);
atmel_pwm_calculate_cdty(state, cprd, &cdty);
@@ -263,6 +269,18 @@ static int atmel_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
val &= ~PWM_CMR_CPOL;
else
val |= PWM_CMR_CPOL;
+
+ /* PWM mode. */
+ if (caps.modes_msk & PWM_MODE_BIT(PUSH_PULL)) {
+ if (state->modebit == PWM_MODE_BIT(PUSH_PULL)) {
+ val |= PWM_CMR_PPM | PWM_CMR_DTLI;
+ val &= ~PWM_CMR_DTHI;
+ } else {
+ val &= ~(PWM_CMR_PPM | PWM_CMR_DTLI |
+ PWM_CMR_DTHI);
+ }
+ }
+
atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, val);
atmel_pwm_set_cprd_cdty(chip, pwm, cprd, cdty);
mutex_lock(&atmel_pwm->isr_lock);
@@ -319,6 +337,20 @@ static const struct atmel_pwm_data atmel_pwm_data_v2 = {
},
};

+static const struct atmel_pwm_data atmel_pwm_data_v3 = {
+ .regs = {
+ .period = PWMV2_CPRD,
+ .period_upd = PWMV2_CPRDUPD,
+ .duty = PWMV2_CDTY,
+ .duty_upd = PWMV2_CDTYUPD,
+ },
+ .caps = {
+ .modes_msk = PWM_MODE_BIT(NORMAL) |
+ PWM_MODE_BIT(COMPLEMENTARY) |
+ PWM_MODE_BIT(PUSH_PULL),
+ },
+};
+
static const struct platform_device_id atmel_pwm_devtypes[] = {
{
.name = "at91sam9rl-pwm",
@@ -341,7 +373,7 @@ static const struct of_device_id atmel_pwm_dt_ids[] = {
.data = &atmel_pwm_data_v2,
}, {
.compatible = "atmel,sama5d2-pwm",
- .data = &atmel_pwm_data_v2,
+ .data = &atmel_pwm_data_v3,
}, {
/* sentinel */
},
--
2.7.4
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