pwm: atmel-tcb: Put per-channel data into driver data

This simplifies the code, reduces the number of memory allocations and
pointer dereferences.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

Author: Uwe Kleine-König

drivers/pwm/pwm-atmel-tcb.c

@@ -56,7 +56,7 @@ struct atmel_tcb_pwm_chip {
 	struct clk *clk;
 	struct clk *gclk;
 	struct clk *slow_clk;
-	struct atmel_tcb_pwm_device *pwms[NPWM];
+	struct atmel_tcb_pwm_device pwms[NPWM];
 	struct atmel_tcb_channel bkup;
 };
 
@@ -72,7 +72,7 @@ static int atmel_tcb_pwm_set_polarity(struct pwm_chip *chip,
 				      enum pwm_polarity polarity)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 
 	tcbpwm->polarity = polarity;
 
@@ -83,19 +83,13 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
 				 struct pwm_device *pwm)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm;
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 	unsigned cmr;
 	int ret;
 
-	tcbpwm = devm_kzalloc(chip->dev, sizeof(*tcbpwm), GFP_KERNEL);
-	if (!tcbpwm)
-		return -ENOMEM;
-
 	ret = clk_prepare_enable(tcbpwmc->clk);
-	if (ret) {
-		devm_kfree(chip->dev, tcbpwm);
+	if (ret)
 		return ret;
-	}
 
 	tcbpwm->polarity = PWM_POLARITY_NORMAL;
 	tcbpwm->duty = 0;
@@ -130,25 +124,20 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
 	regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
 	spin_unlock(&tcbpwmc->lock);
 
-	tcbpwmc->pwms[pwm->hwpwm] = tcbpwm;
-
 	return 0;
 }
 
 static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
 
 	clk_disable_unprepare(tcbpwmc->clk);
-	tcbpwmc->pwms[pwm->hwpwm] = NULL;
-	devm_kfree(chip->dev, tcbpwm);
 }
 
 static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 	unsigned cmr;
 	enum pwm_polarity polarity = tcbpwm->polarity;
 
@@ -205,7 +194,7 @@ static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 	u32 cmr;
 	enum pwm_polarity polarity = tcbpwm->polarity;
 
@@ -290,7 +279,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 				int duty_ns, int period_ns)
 {
 	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = tcbpwmc->pwms[pwm->hwpwm];
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 	struct atmel_tcb_pwm_device *atcbpwm = NULL;
 	int i = 0;
 	int slowclk = 0;
@@ -337,9 +326,9 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	period = div_u64(period_ns, min);
 
 	if (pwm->hwpwm == 0)
-		atcbpwm = tcbpwmc->pwms[1];
+		atcbpwm = &tcbpwmc->pwms[1];
 	else
-		atcbpwm = tcbpwmc->pwms[0];
+		atcbpwm = &tcbpwmc->pwms[0];
 
 	/*
 	 * PWM devices provided by the TCB driver are grouped by 2.