1 files changed, 79 insertions, 32 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 27c30a533759..c249f9791ae8 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -594,45 +594,59 @@ clk_core_forward_rate_req(struct clk_core *core,
 		req->max_rate = old_req->max_rate;
 }
 
-int clk_mux_determine_rate_flags(struct clk_hw *hw,
-				 struct clk_rate_request *req,
-				 unsigned long flags)
+static int
+clk_core_determine_rate_no_reparent(struct clk_hw *hw,
+				    struct clk_rate_request *req)
 {
-	struct clk_core *core = hw->core, *parent, *best_parent = NULL;
-	int i, num_parents, ret;
-	unsigned long best = 0;
-
-	/* if NO_REPARENT flag set, pass through to current parent */
-	if (core->flags & CLK_SET_RATE_NO_REPARENT) {
-		parent = core->parent;
-		if (core->flags & CLK_SET_RATE_PARENT) {
-			struct clk_rate_request parent_req;
+	struct clk_core *core = hw->core;
+	struct clk_core *parent = core->parent;
+	unsigned long best;
+	int ret;
 
-			if (!parent) {
-				req->rate = 0;
-				return 0;
-			}
+	if (core->flags & CLK_SET_RATE_PARENT) {
+		struct clk_rate_request parent_req;
 
-			clk_core_forward_rate_req(core, req, parent, &parent_req, req->rate);
+		if (!parent) {
+			req->rate = 0;
+			return 0;
+		}
 
-			trace_clk_rate_request_start(&parent_req);
+		clk_core_forward_rate_req(core, req, parent, &parent_req,
+					  req->rate);
 
-			ret = clk_core_round_rate_nolock(parent, &parent_req);
-			if (ret)
-				return ret;
+		trace_clk_rate_request_start(&parent_req);
 
-			trace_clk_rate_request_done(&parent_req);
+		ret = clk_core_round_rate_nolock(parent, &parent_req);
+		if (ret)
+			return ret;
 
-			best = parent_req.rate;
-		} else if (parent) {
-			best = clk_core_get_rate_nolock(parent);
-		} else {
-			best = clk_core_get_rate_nolock(core);
-		}
+		trace_clk_rate_request_done(&parent_req);
 
-		goto out;
+		best = parent_req.rate;
+	} else if (parent) {
+		best = clk_core_get_rate_nolock(parent);
+	} else {
+		best = clk_core_get_rate_nolock(core);
 	}
 
+	req->best_parent_rate = best;
+	req->rate = best;
+
+	return 0;
+}
+
+int clk_mux_determine_rate_flags(struct clk_hw *hw,
+				 struct clk_rate_request *req,
+				 unsigned long flags)
+{
+	struct clk_core *core = hw->core, *parent, *best_parent = NULL;
+	int i, num_parents, ret;
+	unsigned long best = 0;
+
+	/* if NO_REPARENT flag set, pass through to current parent */
+	if (core->flags & CLK_SET_RATE_NO_REPARENT)
+		return clk_core_determine_rate_no_reparent(hw, req);
+
 	/* find the parent that can provide the fastest rate <= rate */
 	num_parents = core->num_parents;
 	for (i = 0; i < num_parents; i++) {
@@ -670,9 +684,7 @@ int clk_mux_determine_rate_flags(struct clk_hw *hw,
 	if (!best_parent)
 		return -EINVAL;
 
-out:
-	if (best_parent)
-		req->best_parent_hw = best_parent->hw;
+	req->best_parent_hw = best_parent->hw;
 	req->best_parent_rate = best;
 	req->rate = best;
 
@@ -772,6 +784,25 @@ int __clk_mux_determine_rate_closest(struct clk_hw *hw,
 }
 EXPORT_SYMBOL_GPL(__clk_mux_determine_rate_closest);
 
+/*
+ * clk_hw_determine_rate_no_reparent - clk_ops::determine_rate implementation for a clk that doesn't reparent
+ * @hw: mux type clk to determine rate on
+ * @req: rate request, also used to return preferred frequency
+ *
+ * Helper for finding best parent rate to provide a given frequency.
+ * This can be used directly as a determine_rate callback (e.g. for a
+ * mux), or from a more complex clock that may combine a mux with other
+ * operations.
+ *
+ * Returns: 0 on success, -EERROR value on error
+ */
+int clk_hw_determine_rate_no_reparent(struct clk_hw *hw,
+				      struct clk_rate_request *req)
+{
+	return clk_core_determine_rate_no_reparent(hw, req);
+}
+EXPORT_SYMBOL_GPL(clk_hw_determine_rate_no_reparent);
+
 /***        clk api        ***/
 
 static void clk_core_rate_unprotect(struct clk_core *core)
@@ -1549,6 +1580,7 @@ void clk_hw_forward_rate_request(const struct clk_hw *hw,
 				  parent->core, req,
 				  parent_rate);
 }
+EXPORT_SYMBOL_GPL(clk_hw_forward_rate_request);
 
 static bool clk_core_can_round(struct clk_core * const core)
 {
@@ -3745,6 +3777,13 @@ static int __clk_core_init(struct clk_core *core)
 		goto out;
 	}
 
+	if (core->ops->set_parent && !core->ops->determine_rate) {
+		pr_err("%s: %s must implement .set_parent & .determine_rate\n",
+			__func__, core->name);
+		ret = -EINVAL;
+		goto out;
+	}
+
 	if (core->num_parents > 1 && !core->ops->get_parent) {
 		pr_err("%s: %s must implement .get_parent as it has multi parents\n",
 		       __func__, core->name);
@@ -4301,11 +4340,18 @@ static int clk_nodrv_set_parent(struct clk_hw *hw, u8 index)
 	return -ENXIO;
 }
 
+static int clk_nodrv_determine_rate(struct clk_hw *hw,
+				    struct clk_rate_request *req)
+{
+	return -ENXIO;
+}
+
 static const struct clk_ops clk_nodrv_ops = {
 	.enable		= clk_nodrv_prepare_enable,
 	.disable	= clk_nodrv_disable_unprepare,
 	.prepare	= clk_nodrv_prepare_enable,
 	.unprepare	= clk_nodrv_disable_unprepare,
+	.determine_rate	= clk_nodrv_determine_rate,
 	.set_rate	= clk_nodrv_set_rate,
 	.set_parent	= clk_nodrv_set_parent,
 };
@@ -4695,6 +4741,7 @@ int devm_clk_notifier_register(struct device *dev, struct clk *clk,
 	if (!ret) {
 		devres->clk = clk;
 		devres->nb = nb;
+		devres_add(dev, devres);
 	} else {
 		devres_free(devres);
 	}