pwm: vt8500: Change prototype of a helper to prepare further changes

This prepares the driver for further changes that will make it harder to
determine the pwm_chip from a given vt8500_chip. To just not have to do
that, rework vt8500_pwm_busy_wait() to take a pwm_chip.

Link: https://lore.kernel.org/r/fb384c550b359e7707219f87872bcf36482875ff.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-vt8500.c

@@ -53,8 +53,9 @@ struct vt8500_chip {
 #define to_vt8500_chip(chip)	container_of(chip, struct vt8500_chip, chip)
 
 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
-static inline void vt8500_pwm_busy_wait(struct vt8500_chip *vt8500, int nr, u8 bitmask)
+static inline void vt8500_pwm_busy_wait(struct pwm_chip *chip, int nr, u8 bitmask)
 {
+	struct vt8500_chip *vt8500 = to_vt8500_chip(chip);
 	int loops = msecs_to_loops(10);
 	u32 mask = bitmask << (nr << 8);
 
@@ -62,7 +63,7 @@ static inline void vt8500_pwm_busy_wait(struct vt8500_chip *vt8500, int nr, u8 b
 		cpu_relax();
 
 	if (unlikely(!loops))
-		dev_warn(vt8500->chip.dev, "Waiting for status bits 0x%x to clear timed out\n",
+		dev_warn(chip->dev, "Waiting for status bits 0x%x to clear timed out\n",
 			 mask);
 }
 
@@ -103,18 +104,18 @@ static int vt8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	dc = div64_u64(c, period_ns);
 
 	writel(prescale, vt8500->base + REG_SCALAR(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_SCALAR_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_SCALAR_UPDATE);
 
 	writel(pv, vt8500->base + REG_PERIOD(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_PERIOD_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_PERIOD_UPDATE);
 
 	writel(dc, vt8500->base + REG_DUTY(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_DUTY_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_DUTY_UPDATE);
 
 	val = readl(vt8500->base + REG_CTRL(pwm->hwpwm));
 	val |= CTRL_AUTOLOAD;
 	writel(val, vt8500->base + REG_CTRL(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
 
 	clk_disable(vt8500->clk);
 	return 0;
@@ -135,7 +136,7 @@ static int vt8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	val = readl(vt8500->base + REG_CTRL(pwm->hwpwm));
 	val |= CTRL_ENABLE;
 	writel(val, vt8500->base + REG_CTRL(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
 
 	return 0;
 }
@@ -148,7 +149,7 @@ static void vt8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	val = readl(vt8500->base + REG_CTRL(pwm->hwpwm));
 	val &= ~CTRL_ENABLE;
 	writel(val, vt8500->base + REG_CTRL(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
 
 	clk_disable(vt8500->clk);
 }
@@ -168,7 +169,7 @@ static int vt8500_pwm_set_polarity(struct pwm_chip *chip,
 		val &= ~CTRL_INVERT;
 
 	writel(val, vt8500->base + REG_CTRL(pwm->hwpwm));
-	vt8500_pwm_busy_wait(vt8500, pwm->hwpwm, STATUS_CTRL_UPDATE);
+	vt8500_pwm_busy_wait(chip, pwm->hwpwm, STATUS_CTRL_UPDATE);
 
 	return 0;
 }