From: Kuninori Morimoto <[email protected]>
Current simple-card is supporting this style for clocks
sound {
...
simple-audio-card,cpu {
sound-dai = <&xxx>;
clocks = <&cpu_clock>;
};
simple-audio-card,codec {
sound-dai = <&xxx>;
clocks = <&codec_clock>;
};
};
Now, it can support this style too, because we can use
devm_get_clk_from_child() now.
sound {
...
clocks = <&cpu_clock>, <&codec_clock>;
clock-names = "cpu", "codec";
clock-ranges;
...
simple-audio-card,cpu {
sound-dai = <&xxx>;
};
simple-audio-card,codec {
sound-dai = <&xxx>;
};
};
Signed-off-by: Kuninori Morimoto <[email protected]>
---
.../devicetree/bindings/sound/simple-card.txt | 32 ++++++++++++++++++
sound/soc/generic/simple-card-utils.c | 39 +++++++++++++++++++++-
2 files changed, 70 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/sound/simple-card.txt
b/Documentation/devicetree/bindings/sound/simple-card.txt
index c7a9393..43a710b 100644
--- a/Documentation/devicetree/bindings/sound/simple-card.txt
+++ b/Documentation/devicetree/bindings/sound/simple-card.txt
@@ -86,6 +86,7 @@ Optional CPU/CODEC subnodes properties:
in dai startup() and disabled with
clk_disable_unprepare() in dai
shutdown().
+ see Clock Example.
Example 1 - single DAI link:
@@ -199,3 +200,34 @@ sound {
clocks = ...
};
};
+
+
+Clock Example 1 - clock settings on each subnode
+
+sound {
+ ...
+ simple-audio-card,cpu {
+ sound-dai = <&xxx>;
+ clocks = <&cpu_clock>;
+ };
+ simple-audio-card,codec {
+ sound-dai = <&xxx>;
+ clocks = <&codec_clock>;
+ };
+};
+
+Clock Example 2 - clock settings by clocks
+
+sound {
+ ...
+ clocks = <&cpu_clock>, <&codec_clock>;
+ clock-names = "cpu", "codec";
+ clock-ranges;
+ ...
+ simple-audio-card,cpu {
+ sound-dai = <&xxx>;
+ };
+ simple-audio-card,codec {
+ sound-dai = <&xxx>;
+ };
+};
diff --git a/sound/soc/generic/simple-card-utils.c
b/sound/soc/generic/simple-card-utils.c
index 4924575..c3031a5 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -104,15 +104,52 @@ int asoc_simple_card_parse_clk(struct device *dev,
struct asoc_simple_dai *simple_dai)
{
struct clk *clk;
+ const char *con_id = NULL;
+ const char *port_name[] = {
+ "cpu", "codec"
+ };
u32 val;
/*
+ * We can use this style if "con_id" is not NULL
+ *
+ * sound {
+ * ...
+ * clocks = <&xxx>, <&xxx>;
+ * clock-names = "cpu", "codec";
+ * clock-ranges;
+ *
+ * simple-audio-card,cpu {
+ * sound-dai = <&xxx>;
+ * };
+ * simple-audio-card,codec {
+ * sound-dai = <&xxx>;
+ * };
+ * };
+ */
+ if (of_find_property(dev->of_node, "clock-names", NULL)) {
+ int i;
+ int port_len, node_len;
+
+ for (i = 0; i < ARRAY_SIZE(port_name); i++) {
+ node_len = strlen(node->name);
+ port_len = strlen(port_name[i]);
+
+ if (0 == strncmp(node->name + node_len - port_len,
+ port_name[i], port_len)) {
+ con_id = port_name[i];
+ break;
+ }
+ }
+ }
+
+ /*
* Parse dai->sysclk come from "clocks = <&xxx>"
* (if system has common clock)
* or "system-clock-frequency = <xxx>"
* or device's module clock.
*/
- clk = devm_get_clk_from_child(dev, node, NULL);
+ clk = devm_get_clk_from_child(dev, node, con_id);
if (!IS_ERR(clk)) {
simple_dai->sysclk = clk_get_rate(clk);
} else if (!of_property_read_u32(node, "system-clock-frequency", &val))
{
--
1.9.1
