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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>
This commit is contained in:
Gabriel Fernandez 2016-08-29 14:26:57 +02:00 committed by Stephen Boyd
parent b699f3e391
commit 26bd0a5775
2 changed files with 27 additions and 1 deletions
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2
Documentation/devicetree/bindings/clock/st/st,flexgen.txt
View File

@ -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).

26
drivers/clk/st/clk-flexgen.c
View File

@ -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)) {