clk: Always use the supplied struct clk

CCF clocks should always use the struct clock passed to their methods for
extracting the driver-specific clock information struct. Previously, many
functions would use the clk->dev->priv if the device was bound. This could
cause problems with composite clocks. The individual clocks in a composite
clock did not have the ->dev field filled in. This was fine, because the
device-specific clock information would be used. However, since there was
no ->dev, there was no way to get the parent clock. This caused the
recalc_rate method of the CCF divider clock to fail. One option would be to
use the clk->priv field to get the composite clock and from there get the
appropriate parent device. However, this would tie the implementation to
the composite clock. In general, different devices should not rely on the
contents of ->priv from another device.

The simple solution to this problem is to just always use the supplied
struct clock. The composite clock now fills in the ->dev pointer of its
child clocks.  This allows child clocks to make calls like clk_get_parent()
without issue.

imx avoided the above problem by using a custom get_rate function with
composite clocks.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Acked-by: Lukasz Majewski <lukma@denx.de>

6 files changed, 18 insertions, 20 deletions

diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c
index 414185031e..2ff1d6b47f 100644
--- a/drivers/clk/clk-composite.c
+++ b/drivers/clk/clk-composite.c
@@ -147,6 +147,13 @@ struct clk *clk_register_composite(struct device *dev, const char *name,
 		goto err;
 	}
 
+	if (composite->mux)
+		composite->mux->dev = clk->dev;
+	if (composite->rate)
+		composite->rate->dev = clk->dev;
+	if (composite->gate)
+		composite->gate->dev = clk->dev;
+
 	return clk;
 
 err:
diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 2a68719eb6..34658536c4 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -73,8 +73,7 @@ unsigned long divider_recalc_rate(struct clk *hw, unsigned long parent_rate,
 
 static ulong clk_divider_recalc_rate(struct clk *clk)
 {
-	struct clk_divider *divider = to_clk_divider(clk_dev_binded(clk) ?
-			dev_get_clk_ptr(clk->dev) : clk);
+	struct clk_divider *divider = to_clk_divider(clk);
 	unsigned long parent_rate = clk_get_parent_rate(clk);
 	unsigned int val;
 
@@ -153,8 +152,7 @@ int divider_get_val(unsigned long rate, unsigned long parent_rate,
 
 static ulong clk_divider_set_rate(struct clk *clk, unsigned long rate)
 {
-	struct clk_divider *divider = to_clk_divider(clk_dev_binded(clk) ?
-			dev_get_clk_ptr(clk->dev) : clk);
+	struct clk_divider *divider = to_clk_divider(clk);
 	unsigned long parent_rate = clk_get_parent_rate(clk);
 	int value;
 	u32 val;
diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
index 2ceb6bb171..0eb24b87fc 100644
--- a/drivers/clk/clk-fixed-factor.c
+++ b/drivers/clk/clk-fixed-factor.c
@@ -20,8 +20,7 @@
 
 static ulong clk_factor_recalc_rate(struct clk *clk)
 {
-	struct clk_fixed_factor *fix =
-		to_clk_fixed_factor(dev_get_clk_ptr(clk->dev));
+	struct clk_fixed_factor *fix = to_clk_fixed_factor(clk);
 	unsigned long parent_rate = clk_get_parent_rate(clk);
 	unsigned long long int rate;
 
diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
index 23c1f2c4ba..98e4b80b32 100644
--- a/drivers/clk/clk-gate.c
+++ b/drivers/clk/clk-gate.c
@@ -46,8 +46,7 @@
  */
 static void clk_gate_endisable(struct clk *clk, int enable)
 {
-	struct clk_gate *gate = to_clk_gate(clk_dev_binded(clk) ?
-			dev_get_clk_ptr(clk->dev) : clk);
+	struct clk_gate *gate = to_clk_gate(clk);
 	int set = gate->flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
 	u32 reg;
 
@@ -89,8 +88,7 @@ static int clk_gate_disable(struct clk *clk)
 
 int clk_gate_is_enabled(struct clk *clk)
 {
-	struct clk_gate *gate = to_clk_gate(clk_dev_binded(clk) ?
-			dev_get_clk_ptr(clk->dev) : clk);
+	struct clk_gate *gate = to_clk_gate(clk);
 	u32 reg;
 
 #if CONFIG_IS_ENABLED(SANDBOX_CLK_CCF)
diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
index c69cce0565..26991a5bc8 100644
--- a/drivers/clk/clk-mux.c
+++ b/drivers/clk/clk-mux.c
@@ -38,8 +38,7 @@
 int clk_mux_val_to_index(struct clk *clk, u32 *table, unsigned int flags,
 			 unsigned int val)
 {
-	struct clk_mux *mux = to_clk_mux(clk_dev_binded(clk) ?
-			dev_get_clk_ptr(clk->dev) : clk);
+	struct clk_mux *mux = to_clk_mux(clk);
 	int num_parents = mux->num_parents;
 
 	if (table) {
@@ -82,8 +81,7 @@ unsigned int clk_mux_index_to_val(u32 *table, unsigned int flags, u8 index)
 
 u8 clk_mux_get_parent(struct clk *clk)
 {
-	struct clk_mux *mux = to_clk_mux(clk_dev_binded(clk) ?
-			dev_get_clk_ptr(clk->dev) : clk);
+	struct clk_mux *mux = to_clk_mux(clk);
 	u32 val;
 
 #if CONFIG_IS_ENABLED(SANDBOX_CLK_CCF)
@@ -100,8 +98,7 @@ u8 clk_mux_get_parent(struct clk *clk)
 static int clk_fetch_parent_index(struct clk *clk,
 				  struct clk *parent)
 {
-	struct clk_mux *mux = to_clk_mux(clk_dev_binded(clk) ?
-			dev_get_clk_ptr(clk->dev) : clk);
+	struct clk_mux *mux = to_clk_mux(clk);
 
 	int i;
 
@@ -118,8 +115,7 @@ static int clk_fetch_parent_index(struct clk *clk,
 
 static int clk_mux_set_parent(struct clk *clk, struct clk *parent)
 {
-	struct clk_mux *mux = to_clk_mux(clk_dev_binded(clk) ?
-			dev_get_clk_ptr(clk->dev) : clk);
+	struct clk_mux *mux = to_clk_mux(clk);
 	int index;
 	u32 val;
 	u32 reg;
diff --git a/drivers/clk/imx/clk-gate2.c b/drivers/clk/imx/clk-gate2.c
index b38890d5ba..40b2d4caab 100644
--- a/drivers/clk/imx/clk-gate2.c
+++ b/drivers/clk/imx/clk-gate2.c
@@ -39,7 +39,7 @@ struct clk_gate2 {
 
 static int clk_gate2_enable(struct clk *clk)
 {
-	struct clk_gate2 *gate = to_clk_gate2(dev_get_clk_ptr(clk->dev));
+	struct clk_gate2 *gate = to_clk_gate2(clk);
 	u32 reg;
 
 	reg = readl(gate->reg);
@@ -52,7 +52,7 @@ static int clk_gate2_enable(struct clk *clk)
 
 static int clk_gate2_disable(struct clk *clk)
 {
-	struct clk_gate2 *gate = to_clk_gate2(dev_get_clk_ptr(clk->dev));
+	struct clk_gate2 *gate = to_clk_gate2(clk);
 	u32 reg;
 
 	reg = readl(gate->reg);