clk: composite: allow read-only clocks

This allows readl-only composite clocks by making mux_ops->set_parent and
divider_ops->round_rate/set_rate optional.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-By: Max Schwarz <max.schwarz@online.de>
Tested-By: Max Schwarz <max.schwarz@online.de>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c
index 9548bfcbd56b..faf7c32fe351 100644
--- a/drivers/clk/clk-composite.c
+++ b/drivers/clk/clk-composite.c
@@ -207,7 +207,7 @@ struct clk *clk_register_composite(struct device *dev, const char *name,
         clk_composite_ops = &composite->ops;
 
         if (mux_hw && mux_ops) {
-                if (!mux_ops->get_parent || !mux_ops->set_parent) {
+                if (!mux_ops->get_parent) {
                         clk = ERR_PTR(-EINVAL);
                         goto err;
                 }
@@ -215,7 +215,8 @@ struct clk *clk_register_composite(struct device *dev, const char *name,
                 composite->mux_hw = mux_hw;
                 composite->mux_ops = mux_ops;
                 clk_composite_ops->get_parent = clk_composite_get_parent;
-                clk_composite_ops->set_parent = clk_composite_set_parent;
+                if (mux_ops->set_parent)
+                        clk_composite_ops->set_parent = clk_composite_set_parent;
                 if (mux_ops->determine_rate)
                         clk_composite_ops->determine_rate = clk_composite_determine_rate;
         }
@@ -232,10 +233,6 @@ struct clk *clk_register_composite(struct device *dev, const char *name,
                         if (rate_ops->set_rate) {
                                 clk_composite_ops->set_rate = clk_composite_set_rate;
                         }
-                } else {
-                        WARN(rate_ops->set_rate,
-                                "%s: missing round_rate op is required\n",
-                                __func__);
                 }
 
                 composite->rate_hw = rate_hw;