[PATCH] clk: fix clk_mux_val_to_index() error value

[Jerome Brunet]

clk_mux_val_to_index() is meant to be used by .get_parent(), which
returns a u8, so when the value provided does not map to any valid index,
it is not a good idea to return a negative error value.

Instead, return num_parents which we know is an invalid index and let
CCF deal with it.

Fixes: 77deb66d262f ("clk: mux: add helper function for index/value 
translation")
Signed-off-by: Jerome Brunet <jbru...@baylibre.com>
---
 drivers/clk/clk-mux.c        | 8 ++++----
 include/linux/clk-provider.h | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
index 1628b93655ed..b64e475802cc 100644
--- a/drivers/clk/clk-mux.c
+++ b/drivers/clk/clk-mux.c
@@ -26,8 +26,8 @@
  * parent - parent is adjustable through clk_set_parent
  */
 
-int clk_mux_val_to_index(struct clk_hw *hw, u32 *table, unsigned int flags,
-                        unsigned int val)
+u8 clk_mux_val_to_index(struct clk_hw *hw, u32 *table, unsigned int flags,
+                       unsigned int val)
 {
        int num_parents = clk_hw_get_num_parents(hw);
 
@@ -37,7 +37,7 @@ int clk_mux_val_to_index(struct clk_hw *hw, u32 *table, 
unsigned int flags,
                for (i = 0; i < num_parents; i++)
                        if (table[i] == val)
                                return i;
-               return -EINVAL;
+               return num_parents;
        }
 
        if (val && (flags & CLK_MUX_INDEX_BIT))
@@ -47,7 +47,7 @@ int clk_mux_val_to_index(struct clk_hw *hw, u32 *table, 
unsigned int flags,
                val--;
 
        if (val >= num_parents)
-               return -EINVAL;
+               return num_parents;
 
        return val;
 }
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 60c51871b04b..fc20886ef069 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -550,8 +550,8 @@ struct clk_hw *clk_hw_register_mux_table(struct device 
*dev, const char *name,
                void __iomem *reg, u8 shift, u32 mask,
                u8 clk_mux_flags, u32 *table, spinlock_t *lock);
 
-int clk_mux_val_to_index(struct clk_hw *hw, u32 *table, unsigned int flags,
-                        unsigned int val);
+u8 clk_mux_val_to_index(struct clk_hw *hw, u32 *table, unsigned int flags,
+                       unsigned int val);
 unsigned int clk_mux_index_to_val(u32 *table, unsigned int flags, u8 index);
 
 void clk_unregister_mux(struct clk *clk);
-- 
2.19.1