[PATCH] pwm: pxa: Implement .apply() callback

[PATCH] pwm: pxa: Implement .apply() callback

[Uwe Kleine-König]

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>
---
 drivers/pwm/pwm-pxa.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index 238ec88c130b..0bcaa58c6a91 100644
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -58,7 +58,7 @@ static inline struct pxa_pwm_chip *to_pxa_pwm_chip(struct pwm_chip *chip)
  * duty_ns   = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE
  */
 static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
-			  int duty_ns, int period_ns)
+			  u64 duty_ns, u64 period_ns)
 {
 	struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip);
 	unsigned long long c;
@@ -84,7 +84,7 @@ static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (duty_ns == period_ns)
 		dc = PWMDCR_FD;
 	else
-		dc = (pv + 1) * duty_ns / period_ns;
+		dc = mul_u64_u64_div_u64(pv + 1, duty_ns, period_ns);
 
 	/* NOTE: the clock to PWM has to be enabled first
 	 * before writing to the registers
@@ -115,10 +115,33 @@ static void pxa_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	clk_disable_unprepare(pc->clk);
 }
 
+static int pxa_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)
+			pxa_pwm_disable(chip, pwm);
+
+		return 0;
+	}
+
+	err = pxa_pwm_config(chip, pwm, state->duty_cycle, state->period);
+	if (err)
+		return err;
+
+	if (!pwm->state.enabled)
+		return pxa_pwm_enable(chip, pwm);
+
+	return 0;
+}
+
 static const struct pwm_ops pxa_pwm_ops = {
-	.config = pxa_pwm_config,
-	.enable = pxa_pwm_enable,
-	.disable = pxa_pwm_disable,
+	.apply = pxa_pwm_apply,
 	.owner = THIS_MODULE,
 };
 

base-commit: b6ce2af8766c39a5b09afa466ed4d0ef2d8b5a65
prerequisite-patch-id: b990c8483bb4fb1637c6d956e60e160524bd84ba
-- 
2.30.2