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Commit 26bd0a57 authored by Gabriel Fernandez's avatar Gabriel Fernandez Committed by Stephen Boyd
Browse files

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: default avatarOlivier Bideau <olivier.bideau@st.com>
Signed-off-by: default avatarGabriel Fernandez <gabriel.fernandez@st.com>
Acked-by: default avatarPeter Griffin <peter.griffin@linaro.org>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent b699f3e3

Documentation/devicetree/bindings/clock/st/st,flexgen.txt

+2 −0
Original line number Diff line number Diff line
@@ -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).

drivers/clk/st/clk-flexgen.c

+25 −1
Original line number Diff line number Diff line
@@ -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)) {