clk: mux: add set parent support
Add set parent support for clk mux
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
index 81d1e7e..5acc0b8 100644
--- a/drivers/clk/clk-mux.c
+++ b/drivers/clk/clk-mux.c
@@ -60,7 +60,24 @@
return val;
}
-static u8 clk_mux_get_parent(struct clk *clk)
+unsigned int clk_mux_index_to_val(u32 *table, unsigned int flags, u8 index)
+{
+ unsigned int val = index;
+
+ if (table) {
+ val = table[index];
+ } else {
+ if (flags & CLK_MUX_INDEX_BIT)
+ val = 1 << index;
+
+ if (flags & CLK_MUX_INDEX_ONE)
+ val++;
+ }
+
+ return val;
+}
+
+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);
@@ -77,8 +94,57 @@
return clk_mux_val_to_index(clk, mux->table, mux->flags, val);
}
+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);
+
+ int i;
+
+ if (!parent)
+ return -EINVAL;
+
+ for (i = 0; i < mux->num_parents; i++) {
+ if (!strcmp(parent->dev->name, mux->parent_names[i]))
+ return i;
+ }
+
+ return -EINVAL;
+}
+
+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);
+ int index;
+ u32 val;
+ u32 reg;
+
+ index = clk_fetch_parent_index(clk, parent);
+ if (index < 0) {
+ printf("Could not fetch index\n");
+ return index;
+ }
+
+ val = clk_mux_index_to_val(mux->table, mux->flags, index);
+
+ if (mux->flags & CLK_MUX_HIWORD_MASK) {
+ reg = mux->mask << (mux->shift + 16);
+ } else {
+ reg = readl(mux->reg);
+ reg &= ~(mux->mask << mux->shift);
+ }
+ val = val << mux->shift;
+ reg |= val;
+ writel(reg, mux->reg);
+
+ return 0;
+}
+
const struct clk_ops clk_mux_ops = {
- .get_rate = clk_generic_get_rate,
+ .get_rate = clk_generic_get_rate,
+ .set_parent = clk_mux_set_parent,
};
struct clk *clk_hw_register_mux_table(struct device *dev, const char *name,