clk: sunxi-ng: Use a separate lock for each CCU instance

Some platforms have more than one CCU driver loaded: the main CCU, the
PRCM, the display engine, and possibly others. All of these hardware
blocks have separate MMIO spaces, so there is no need to synchronize
between them.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210901050526.45673-4-samuel@sholland.org

drivers/clk/sunxi-ng/ccu_common.c

@@ -17,11 +17,10 @@
 
 struct sunxi_ccu {
 	const struct sunxi_ccu_desc	*desc;
+	spinlock_t			lock;
 	struct ccu_reset		reset;
 };
 
-static DEFINE_SPINLOCK(ccu_lock);
-
 void ccu_helper_wait_for_lock(struct ccu_common *common, u32 lock)
 {
 	void __iomem *addr;
@@ -94,6 +93,8 @@ static int sunxi_ccu_probe(struct sunxi_ccu *ccu, struct device *dev,
 
 	ccu->desc = desc;
 
+	spin_lock_init(&ccu->lock);
+
 	for (i = 0; i < desc->num_ccu_clks; i++) {
 		struct ccu_common *cclk = desc->ccu_clks[i];
 
@@ -101,7 +102,7 @@ static int sunxi_ccu_probe(struct sunxi_ccu *ccu, struct device *dev,
 			continue;
 
 		cclk->base = reg;
-		cclk->lock = &ccu_lock;
+		cclk->lock = &ccu->lock;
 	}
 
 	for (i = 0; i < desc->hw_clks->num ; i++) {
@@ -133,7 +134,7 @@ static int sunxi_ccu_probe(struct sunxi_ccu *ccu, struct device *dev,
 	reset->rcdev.owner = dev ? dev->driver->owner : THIS_MODULE;
 	reset->rcdev.nr_resets = desc->num_resets;
 	reset->base = reg;
-	reset->lock = &ccu_lock;
+	reset->lock = &ccu->lock;
 	reset->reset_map = desc->resets;
 
 	ret = reset_controller_register(&reset->rcdev);