pwm: twl: Implement .apply() callback

To eventually get rid of all legacy drivers convert this driver to the
modern world implementing .apply(). This just pushes down a slightly
optimized variant of how legacy drivers are handled in the core.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-twl.c

@@ -58,9 +58,9 @@ static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
 }
 
 static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
-			      int duty_ns, int period_ns)
+			  u64 duty_ns, u64 period_ns)
 {
-	int duty_cycle = DIV_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
+	int duty_cycle = DIV64_U64_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
 	u8 pwm_config[2] = { 1, 0 };
 	int base, ret;
 
@@ -279,19 +279,65 @@ out:
 	mutex_unlock(&twl->mutex);
 }
 
+static int twl4030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			     const struct pwm_state *state)
+{
+	int err;
+
+	if (state->polarity != PWM_POLARITY_NORMAL)
+		return -EINVAL;
+
+	if (!state->enabled) {
+		if (pwm->state.enabled)
+			twl4030_pwm_disable(chip, pwm);
+
+		return 0;
+	}
+
+	err = twl_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period);
+	if (err)
+		return err;
+
+	if (!pwm->state.enabled)
+		err = twl4030_pwm_enable(chip, pwm);
+
+	return err;
+}
+
+static int twl6030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			     const struct pwm_state *state)
+{
+	int err;
+
+	if (state->polarity != PWM_POLARITY_NORMAL)
+		return -EINVAL;
+
+	if (!state->enabled) {
+		if (pwm->state.enabled)
+			twl6030_pwm_disable(chip, pwm);
+
+		return 0;
+	}
+
+	err = twl_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period);
+	if (err)
+		return err;
+
+	if (!pwm->state.enabled)
+		err = twl6030_pwm_enable(chip, pwm);
+
+	return err;
+}
+
 static const struct pwm_ops twl4030_pwm_ops = {
-	.config = twl_pwm_config,
-	.enable = twl4030_pwm_enable,
-	.disable = twl4030_pwm_disable,
+	.apply = twl4030_pwm_apply,
 	.request = twl4030_pwm_request,
 	.free = twl4030_pwm_free,
 	.owner = THIS_MODULE,
 };
 
 static const struct pwm_ops twl6030_pwm_ops = {
-	.config = twl_pwm_config,
-	.enable = twl6030_pwm_enable,
-	.disable = twl6030_pwm_disable,
+	.apply = twl6030_pwm_apply,
 	.owner = THIS_MODULE,
 };