clocksource/drivers/samsung_pwm: Constify passed structure

The 'struct samsung_pwm_variant' argument passed to initialization
functions is not modified, so it can be made const for safety.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210506202729.157260-2-krzysztof.kozlowski@canonical.com

drivers/clocksource/samsung_pwm_timer.c

@@ -401,7 +401,7 @@ static int __init _samsung_pwm_clocksource_init(void)
 
 void __init samsung_pwm_clocksource_init(void __iomem *base,
 					 unsigned int *irqs,
-					 struct samsung_pwm_variant *variant)
+					 const struct samsung_pwm_variant *variant)
 {
 	pwm.base = base;
 	memcpy(&pwm.variant, variant, sizeof(pwm.variant));

include/clocksource/samsung_pwm.h

@@ -28,6 +28,6 @@ struct samsung_pwm_variant {
 
 void samsung_pwm_clocksource_init(void __iomem *base,
 				  unsigned int *irqs,
-				  struct samsung_pwm_variant *variant);
+				  const struct samsung_pwm_variant *variant);
 
 #endif /* __CLOCKSOURCE_SAMSUNG_PWM_H */