[PATCH v3 05/14] drivers: clk: st: Add clock propagation for audio clocks
From: gabriel.fernandez at st.com <hidden>
Date: 2016-08-29 12:30:04
Also in:
linux-clk, linux-devicetree, lkml
Subsystem:
common clk framework, open firmware and flattened device tree bindings, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
From: Gabriel Fernandez <redacted> This patch allows fine tuning of the quads FS for audio clocks accuracy. Signed-off-by: Olivier Bideau <redacted> Signed-off-by: Gabriel Fernandez <redacted> Acked-by: Peter Griffin <peter.griffin@linaro.org> --- .../devicetree/bindings/clock/st/st,flexgen.txt | 2 ++ drivers/clk/st/clk-flexgen.c | 26 +++++++++++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-)
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 546bd79..7ed05f0 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 +283,9 @@ 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)) {
--
1.9.1