pwm: clps711x: Drop driver local locking

The pwm core serializes calls to .apply(), so the spinlock adds no
additional protection. Disabling the irq is also irrelevant as the driver
isn't an atomic one and so the callbacks cannot be called from atomic
context.

Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/d4931dc0c0d657d80722cfe7d97cb4fb4ccec90e.1750788649.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <[email protected]>

Author: ukleinek

drivers/pwm/pwm-clps711x.c

@@ -14,7 +14,6 @@
 struct clps711x_chip {
 	void __iomem *pmpcon;
 	struct clk *clk;
-	spinlock_t lock;
 };
 
 static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip)
@@ -42,7 +41,6 @@ static int clps711x_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct clps711x_chip *priv = to_clps711x_chip(chip);
 	/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
 	u32 shift = (pwm->hwpwm + 1) * 4;
-	unsigned long flags;
 	u32 pmpcon, val;
 
 	if (state->polarity != PWM_POLARITY_NORMAL)
@@ -56,15 +54,11 @@ static int clps711x_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	else
 		val = 0;
 
-	spin_lock_irqsave(&priv->lock, flags);
-
 	pmpcon = readl(priv->pmpcon);
 	pmpcon &= ~(0xf << shift);
 	pmpcon |= val << shift;
 	writel(pmpcon, priv->pmpcon);
 
-	spin_unlock_irqrestore(&priv->lock, flags);
-
 	return 0;
 }
 
@@ -93,8 +87,6 @@ static int clps711x_pwm_probe(struct platform_device *pdev)
 
 	chip->ops = &clps711x_pwm_ops;
 
-	spin_lock_init(&priv->lock);
-
 	return devm_pwmchip_add(&pdev->dev, chip);
 }