[RESEND PATCH v2 04/13] drivers: clk: st: Add clock propagation for audio clocks

Gabriel Fernandez
2016-06-16T09:20:24Z

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@linaro.org>
---
.../devicetree/bindings/clock/st/st,flexgen.txt | 2 ++
drivers/clk/st/clk-flexgen.c | 24 ++++++++++++++++++++++
2 files changed, 26 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/st/st,flexgen.txt b/Documentation/devicetree/bindings/clock/st/st,flexgen.txt
index b7ee5c7..d68f6a5f 100644
--- 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 627267c..33d6ced 100644
--- 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 +283,8 @@ 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;

@@ -282,6 +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;
--
1.9.1