pwm: brcmstb: Remove useless locking

The lock only protects against concurrent users of the PWM API. This is not
expected to be necessary. And if there was such an issue, this is better
handled in the PWM core instead as it affects all drivers in the same way.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-brcmstb.c

@@ -53,7 +53,6 @@
 
 struct brcmstb_pwm {
 	void __iomem *base;
-	spinlock_t lock;
 	struct clk *clk;
 	struct pwm_chip chip;
 };
@@ -159,7 +158,6 @@ static int brcmstb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	 * generator output a base frequency for the constant frequency
 	 * generator to derive from.
 	 */
-	spin_lock(&p->lock);
 	brcmstb_pwm_writel(p, cword >> 8, PWM_CWORD_MSB(channel));
 	brcmstb_pwm_writel(p, cword & 0xff, PWM_CWORD_LSB(channel));
 
@@ -171,7 +169,6 @@ static int brcmstb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	/* Configure on and period value */
 	brcmstb_pwm_writel(p, pc, PWM_PERIOD(channel));
 	brcmstb_pwm_writel(p, dc, PWM_ON(channel));
-	spin_unlock(&p->lock);
 
 	return 0;
 }
@@ -182,7 +179,6 @@ static inline void brcmstb_pwm_enable_set(struct brcmstb_pwm *p,
 	unsigned int shift = channel * CTRL_CHAN_OFFS;
 	u32 value;
 
-	spin_lock(&p->lock);
 	value = brcmstb_pwm_readl(p, PWM_CTRL);
 
 	if (enable) {
@@ -194,7 +190,6 @@ static inline void brcmstb_pwm_enable_set(struct brcmstb_pwm *p,
 	}
 
 	brcmstb_pwm_writel(p, value, PWM_CTRL);
-	spin_unlock(&p->lock);
 }
 
 static int brcmstb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -243,8 +238,6 @@ static int brcmstb_pwm_probe(struct platform_device *pdev)
 	if (!p)
 		return -ENOMEM;
 
-	spin_lock_init(&p->lock);
-
 	p->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(p->clk)) {
 		dev_err(&pdev->dev, "failed to obtain clock\n");