Support readonly dividers using the CLK_MUX_READ_ONLY flag.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/clk/clk-mux.c | 7 +++++++
include/linux/clk.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
index ebf736bdff..e9cb614005 100644
--- a/drivers/clk/clk-mux.c
+++ b/drivers/clk/clk-mux.c
@@ -33,6 +33,13 @@ static int clk_mux_set_parent(struct clk *clk, u8 idx)
struct clk_mux *m = container_of(clk, struct clk_mux, clk);
u32 val;
+ if (m->flags & CLK_MUX_READ_ONLY) {
+ if (clk_mux_get_parent(clk) != idx)
+ return -EPERM;
+ else
+ return 0;
+ }
+
val = readl(m->reg);
val &= ~(((1 << m->width) - 1) << m->shift);
val |= idx << m->shift;
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 2e698e2ea6..2492608a15 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -344,6 +344,7 @@ struct clk_divider {
#define CLK_DIVIDER_READ_ONLY (1 << 5)
#define CLK_MUX_HIWORD_MASK (1 << 2)
+#define CLK_MUX_READ_ONLY (1 << 3) /* mux can't be changed */
extern struct clk_ops clk_divider_ops;
--
2.20.1
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