1 files changed, 129 insertions, 22 deletions

diff --git a/drivers/clk/mediatek/clk-mux.c b/drivers/clk/mediatek/clk-mux.c
index 6d3a50eb7d6f..ba1720b9e231 100644
--- a/drivers/clk/mediatek/clk-mux.c
+++ b/drivers/clk/mediatek/clk-mux.c
@@ -4,15 +4,27 @@
  * Author: Owen Chen <owen.chen@mediatek.com>
  */
 
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/compiler_types.h>
+#include <linux/container_of.h>
+#include <linux/err.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
 
-#include "clk-mtk.h"
 #include "clk-mux.h"
 
+struct mtk_clk_mux {
+	struct clk_hw hw;
+	struct regmap *regmap;
+	const struct mtk_mux *data;
+	spinlock_t *lock;
+	bool reparent;
+};
+
 static inline struct mtk_clk_mux *to_mtk_clk_mux(struct clk_hw *hw)
 {
 	return container_of(hw, struct mtk_clk_mux, hw);
@@ -117,9 +129,18 @@ static int mtk_clk_mux_set_parent_setclr_lock(struct clk_hw *hw, u8 index)
 	return 0;
 }
 
+static int mtk_clk_mux_determine_rate(struct clk_hw *hw,
+				      struct clk_rate_request *req)
+{
+	struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+
+	return clk_mux_determine_rate_flags(hw, req, mux->data->flags);
+}
+
 const struct clk_ops mtk_mux_clr_set_upd_ops = {
 	.get_parent = mtk_clk_mux_get_parent,
 	.set_parent = mtk_clk_mux_set_parent_setclr_lock,
+	.determine_rate = mtk_clk_mux_determine_rate,
 };
 EXPORT_SYMBOL_GPL(mtk_mux_clr_set_upd_ops);
 
@@ -129,16 +150,17 @@ const struct clk_ops mtk_mux_gate_clr_set_upd_ops  = {
 	.is_enabled = mtk_clk_mux_is_enabled,
 	.get_parent = mtk_clk_mux_get_parent,
 	.set_parent = mtk_clk_mux_set_parent_setclr_lock,
+	.determine_rate = mtk_clk_mux_determine_rate,
 };
 EXPORT_SYMBOL_GPL(mtk_mux_gate_clr_set_upd_ops);
 
-static struct clk *mtk_clk_register_mux(const struct mtk_mux *mux,
+static struct clk_hw *mtk_clk_register_mux(const struct mtk_mux *mux,
 				 struct regmap *regmap,
 				 spinlock_t *lock)
 {
 	struct mtk_clk_mux *clk_mux;
 	struct clk_init_data init = {};
-	struct clk *clk;
+	int ret;
 
 	clk_mux = kzalloc(sizeof(*clk_mux), GFP_KERNEL);
 	if (!clk_mux)
@@ -155,49 +177,134 @@ static struct clk *mtk_clk_register_mux(const struct mtk_mux *mux,
 	clk_mux->lock = lock;
 	clk_mux->hw.init = &init;
 
-	clk = clk_register(NULL, &clk_mux->hw);
-	if (IS_ERR(clk)) {
+	ret = clk_hw_register(NULL, &clk_mux->hw);
+	if (ret) {
 		kfree(clk_mux);
-		return clk;
+		return ERR_PTR(ret);
 	}
 
-	return clk;
+	return &clk_mux->hw;
+}
+
+static void mtk_clk_unregister_mux(struct clk_hw *hw)
+{
+	struct mtk_clk_mux *mux;
+	if (!hw)
+		return;
+
+	mux = to_mtk_clk_mux(hw);
+
+	clk_hw_unregister(hw);
+	kfree(mux);
 }
 
 int mtk_clk_register_muxes(const struct mtk_mux *muxes,
 			   int num, struct device_node *node,
 			   spinlock_t *lock,
-			   struct clk_onecell_data *clk_data)
+			   struct clk_hw_onecell_data *clk_data)
 {
 	struct regmap *regmap;
-	struct clk *clk;
+	struct clk_hw *hw;
 	int i;
 
 	regmap = device_node_to_regmap(node);
 	if (IS_ERR(regmap)) {
-		pr_err("Cannot find regmap for %pOF: %ld\n", node,
-		       PTR_ERR(regmap));
+		pr_err("Cannot find regmap for %pOF: %pe\n", node, regmap);
 		return PTR_ERR(regmap);
 	}
 
 	for (i = 0; i < num; i++) {
 		const struct mtk_mux *mux = &muxes[i];
 
-		if (IS_ERR_OR_NULL(clk_data->clks[mux->id])) {
-			clk = mtk_clk_register_mux(mux, regmap, lock);
+		if (!IS_ERR_OR_NULL(clk_data->hws[mux->id])) {
+			pr_warn("%pOF: Trying to register duplicate clock ID: %d\n",
+				node, mux->id);
+			continue;
+		}
 
-			if (IS_ERR(clk)) {
-				pr_err("Failed to register clk %s: %ld\n",
-				       mux->name, PTR_ERR(clk));
-				continue;
-			}
+		hw = mtk_clk_register_mux(mux, regmap, lock);
 
-			clk_data->clks[mux->id] = clk;
+		if (IS_ERR(hw)) {
+			pr_err("Failed to register clk %s: %pe\n", mux->name,
+			       hw);
+			goto err;
 		}
+
+		clk_data->hws[mux->id] = hw;
 	}
 
 	return 0;
+
+err:
+	while (--i >= 0) {
+		const struct mtk_mux *mux = &muxes[i];
+
+		if (IS_ERR_OR_NULL(clk_data->hws[mux->id]))
+			continue;
+
+		mtk_clk_unregister_mux(clk_data->hws[mux->id]);
+		clk_data->hws[mux->id] = ERR_PTR(-ENOENT);
+	}
+
+	return PTR_ERR(hw);
 }
 EXPORT_SYMBOL_GPL(mtk_clk_register_muxes);
 
+void mtk_clk_unregister_muxes(const struct mtk_mux *muxes, int num,
+			      struct clk_hw_onecell_data *clk_data)
+{
+	int i;
+
+	if (!clk_data)
+		return;
+
+	for (i = num; i > 0; i--) {
+		const struct mtk_mux *mux = &muxes[i - 1];
+
+		if (IS_ERR_OR_NULL(clk_data->hws[mux->id]))
+			continue;
+
+		mtk_clk_unregister_mux(clk_data->hws[mux->id]);
+		clk_data->hws[mux->id] = ERR_PTR(-ENOENT);
+	}
+}
+EXPORT_SYMBOL_GPL(mtk_clk_unregister_muxes);
+
+/*
+ * This clock notifier is called when the frequency of the parent
+ * PLL clock is to be changed. The idea is to switch the parent to a
+ * stable clock, such as the main oscillator, while the PLL frequency
+ * stabilizes.
+ */
+static int mtk_clk_mux_notifier_cb(struct notifier_block *nb,
+				   unsigned long event, void *_data)
+{
+	struct clk_notifier_data *data = _data;
+	struct clk_hw *hw = __clk_get_hw(data->clk);
+	struct mtk_mux_nb *mux_nb = to_mtk_mux_nb(nb);
+	int ret = 0;
+
+	switch (event) {
+	case PRE_RATE_CHANGE:
+		mux_nb->original_index = mux_nb->ops->get_parent(hw);
+		ret = mux_nb->ops->set_parent(hw, mux_nb->bypass_index);
+		break;
+	case POST_RATE_CHANGE:
+	case ABORT_RATE_CHANGE:
+		ret = mux_nb->ops->set_parent(hw, mux_nb->original_index);
+		break;
+	}
+
+	return notifier_from_errno(ret);
+}
+
+int devm_mtk_clk_mux_notifier_register(struct device *dev, struct clk *clk,
+				       struct mtk_mux_nb *mux_nb)
+{
+	mux_nb->nb.notifier_call = mtk_clk_mux_notifier_cb;
+
+	return devm_clk_notifier_register(dev, clk, &mux_nb->nb);
+}
+EXPORT_SYMBOL_GPL(devm_mtk_clk_mux_notifier_register);
+
 MODULE_LICENSE("GPL");