[PATCH 4/9] clk: sunxi-ng: mux: Add support for mux tables

[Chen-Yu Tsai]

Some clock muxes have holes, i.e. invalid or unconnected inputs,
between parent mux values.

Add support for specifying a mux table to map clock parents to
mux values.

Signed-off-by: Chen-Yu Tsai <w...@csie.org>
---
 drivers/clk/sunxi-ng/ccu_mux.c | 12 ++++++++++++
 drivers/clk/sunxi-ng/ccu_mux.h | 12 ++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c
index 1329b9ab481e..68b32f168a74 100644
--- a/drivers/clk/sunxi-ng/ccu_mux.c
+++ b/drivers/clk/sunxi-ng/ccu_mux.c
@@ -107,6 +107,15 @@ u8 ccu_mux_helper_get_parent(struct ccu_common *common,
        parent = reg >> cm->shift;
        parent &= (1 << cm->width) - 1;
 
+       if (cm->table) {
+               int num_parents = clk_hw_get_num_parents(&common->hw);
+               int i;
+
+               for (i = 0; i < num_parents; i++)
+                       if (cm->table[i] == parent)
+                               return i;
+       }
+
        return parent;
 }
 
@@ -117,6 +126,9 @@ int ccu_mux_helper_set_parent(struct ccu_common *common,
        unsigned long flags;
        u32 reg;
 
+       if (cm->table)
+               index = cm->table[index];
+
        spin_lock_irqsave(common->lock, flags);
 
        reg = readl(common->base + common->reg);
diff --git a/drivers/clk/sunxi-ng/ccu_mux.h b/drivers/clk/sunxi-ng/ccu_mux.h
index d35ce5e93840..f0078de78712 100644
--- a/drivers/clk/sunxi-ng/ccu_mux.h
+++ b/drivers/clk/sunxi-ng/ccu_mux.h
@@ -6,8 +6,9 @@
 #include "ccu_common.h"
 
 struct ccu_mux_internal {
-       u8      shift;
-       u8      width;
+       u8              shift;
+       u8              width;
+       const u8        *table;
 
        struct {
                u8      index;
@@ -21,6 +22,13 @@ struct ccu_mux_internal {
        } variable_prediv;
 };
 
+#define SUNXI_CLK_MUX_TABLE(_shift, _width, _table)    \
+       {                                               \
+               .shift  = _shift,                       \
+               .width  = _width,                       \
+               .table  = _table,                       \
+       }
+
 #define SUNXI_CLK_MUX(_shift, _width)  \
        {                                       \
                .shift  = _shift,               \
-- 
2.8.1