pwm: sl28cpld: Consistently name pwm_chip variables "chip"

Nearly all PWM drivers use the name "chip" for the member in the driver
struct pointing to the pwm_chip. Also all local variables and function
parameters with this type use this name. Rename the struct pwm_chip
member accordingly for consistency.

Also rename the parameter of the macro sl28cpld_pwm_from_chip to "chip".
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-sl28cpld.c

@@ -80,12 +80,15 @@
 	regmap_write((priv)->regmap, (priv)->offset + (reg), (val))
 
 struct sl28cpld_pwm {
-	struct pwm_chip pwm_chip;
+	struct pwm_chip chip;
 	struct regmap *regmap;
 	u32 offset;
 };
-#define sl28cpld_pwm_from_chip(_chip) \
-	container_of(_chip, struct sl28cpld_pwm, pwm_chip)
+
+static inline struct sl28cpld_pwm *sl28cpld_pwm_from_chip(struct pwm_chip *chip)
+{
+	return container_of(chip, struct sl28cpld_pwm, chip);
+}
 
 static int sl28cpld_pwm_get_state(struct pwm_chip *chip,
 				  struct pwm_device *pwm,
@@ -228,12 +231,12 @@ static int sl28cpld_pwm_probe(struct platform_device *pdev)
 	}
 
 	/* Initialize the pwm_chip structure */
-	chip = &priv->pwm_chip;
+	chip = &priv->chip;
 	chip->dev = &pdev->dev;
 	chip->ops = &sl28cpld_pwm_ops;
 	chip->npwm = 1;
 
-	ret = devm_pwmchip_add(&pdev->dev, &priv->pwm_chip);
+	ret = devm_pwmchip_add(&pdev->dev, chip);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add PWM chip (%pe)",
 			ERR_PTR(ret));