drivers: clk: st: Add clock propagation for audio clocks

This patch allows fine tuning of the quads FS for audio clocks
accuracy.

Signed-off-by: Olivier Bideau <olivier.bideau@st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Acked-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/Documentation/devicetree/bindings/clock/st/st,flexgen.txt b/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
index b7ee5c7..d68f6a5 100644 (file)
--- a/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
+++ b/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
@@ -60,6 +60,8 @@ This binding uses the common clock binding[2].
 Required properties:
 - compatible : shall be:
   "st,flexgen"
+  "st,flexgen-audio", "st,flexgen" (enable clock propagation on parent for
+  audio use case)
 
 - #clock-cells : from common clock binding; shall be set to 1 (multiple clock
   outputs).

diff --git a/drivers/clk/st/clk-flexgen.c b/drivers/clk/st/clk-flexgen.c
index 546bd79..7ed05f0 100644 (file)
--- a/drivers/clk/st/clk-flexgen.c
+++ b/drivers/clk/st/clk-flexgen.c
@@ -15,6 +15,10 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 
+struct clkgen_data {
+       unsigned long flags;
+};
+
 struct flexgen {
        struct clk_hw hw;
 
@@ -259,6 +263,18 @@ static const char ** __init flexgen_get_parents(struct device_node *np,
        return parents;
 }
 
+static const struct clkgen_data clkgen_audio = {
+       .flags = CLK_SET_RATE_PARENT,
+};
+
+static const struct of_device_id flexgen_of_match[] = {
+       {
+               .compatible = "st,flexgen-audio",
+               .data = &clkgen_audio,
+       },
+       {}
+};
+
 static void __init st_of_flexgen_setup(struct device_node *np)
 {
        struct device_node *pnode;
@@ -267,6 +283,9 @@ static void __init st_of_flexgen_setup(struct device_node *np)
        const char **parents;
        int num_parents, i;
        spinlock_t *rlock = NULL;
+       const struct of_device_id *match;
+       struct clkgen_data *data = NULL;
+       unsigned long flex_flags = 0;
        int ret;
 
        pnode = of_get_parent(np);
@@ -281,6 +300,12 @@ static void __init st_of_flexgen_setup(struct device_node *np)
        if (!parents)
                return;
 
+       match = of_match_node(flexgen_of_match, np);
+       if (match) {
+               data = (struct clkgen_data *)match->data;
+               flex_flags = data->flags;
+       }
+
        clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
        if (!clk_data)
                goto err;
@@ -307,7 +332,6 @@ static void __init st_of_flexgen_setup(struct device_node *np)
        for (i = 0; i < clk_data->clk_num; i++) {
                struct clk *clk;
                const char *clk_name;
-               unsigned long flex_flags = 0;
 
                if (of_property_read_string_index(np, "clock-output-names",
                                                  i, &clk_name)) {