@@ -61,21 +61,31 @@ static const struct clk_ops ti_syscon_gate_clk_ops = {
static struct clk_hw
*ti_syscon_gate_clk_register(struct device *dev, struct regmap *regmap,
+ const char *parent_name,
const struct ti_syscon_gate_clk_data *data)
{
struct ti_syscon_gate_clk_priv *priv;
struct clk_init_data init;
+ char *name = NULL;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return ERR_PTR(-ENOMEM);
- init.name = data->name;
init.ops = &ti_syscon_gate_clk_ops;
- init.parent_names = NULL;
- init.num_parents = 0;
- init.flags = 0;
+ if (parent_name) {
+ name = kasprintf(GFP_KERNEL, "%s:%s", data->name, parent_name);
+ init.name = name;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+ init.flags = CLK_SET_RATE_PARENT;
+ } else {
+ init.name = data->name;
+ init.parent_names = NULL;
+ init.num_parents = 0;
+ init.flags = 0;
+ }
priv->regmap = regmap;
priv->reg = data->offset;
@@ -83,6 +93,10 @@ static struct clk_hw
priv->hw.init = &init;
ret = devm_clk_hw_register(dev, &priv->hw);
+
+ if (name)
+ kfree(init.name);
+
if (ret)
return ERR_PTR(ret);
@@ -94,8 +108,9 @@ static int ti_syscon_gate_clk_probe(struct platform_device *pdev)
const struct ti_syscon_gate_clk_data *data, *p;
struct clk_hw_onecell_data *hw_data;
struct device *dev = &pdev->dev;
+ int num_clks, num_parents, i;
+ const char *parent_name;
struct regmap *regmap;
- int num_clks, i;
data = device_get_match_data(dev);
if (!data)
@@ -110,6 +125,13 @@ static int ti_syscon_gate_clk_probe(struct platform_device *pdev)
for (p = data; p->name; p++)
num_clks++;
+ num_parents = of_clk_get_parent_count(dev->of_node);
+ if (of_device_is_compatible(dev->of_node, "ti,am62-audio-refclk") &&
+ num_parents == 0) {
+ return dev_err_probe(dev, -EINVAL,
+ "must specify a parent clock\n");
+ }
+
hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, num_clks),
GFP_KERNEL);
if (!hw_data)
@@ -117,8 +139,10 @@ static int ti_syscon_gate_clk_probe(struct platform_device *pdev)
hw_data->num = num_clks;
+ parent_name = of_clk_get_parent_name(dev->of_node, 0);
for (i = 0; i < num_clks; i++) {
hw_data->hws[i] = ti_syscon_gate_clk_register(dev, regmap,
+ parent_name,
&data[i]);
if (IS_ERR(hw_data->hws[i]))
dev_warn(dev, "failed to register %s\n",
@@ -166,6 +190,11 @@ static const struct ti_syscon_gate_clk_data am62_clk_data[] = {
{ /* Sentinel */ },
};
+static const struct ti_syscon_gate_clk_data am62_audio_clk_data[] = {
+ TI_SYSCON_CLK_GATE("audio_refclk", 0x0, 15),
+ { /* Sentinel */ },
+};
+
static const struct of_device_id ti_syscon_gate_clk_ids[] = {
{
.compatible = "ti,am654-ehrpwm-tbclk",
@@ -179,6 +208,10 @@ static const struct of_device_id ti_syscon_gate_clk_ids[] = {
.compatible = "ti,am62-epwm-tbclk",
.data = &am62_clk_data,
},
+ {
+ .compatible = "ti,am62-audio-refclk",
+ .data = &am62_audio_clk_data,
+ },
{ }
};
MODULE_DEVICE_TABLE(of, ti_syscon_gate_clk_ids);
TI's AM62 SoC can optionally provide two audio reference clocks (AUDIO_REFCLKx) to external peripherals. By default this reference clock is looped-back inside the SoC to a mux that goes to McASP AHCLK, but can optionally be enabled as an output to peripherals outside the SoC by setting a bit through CTRL_MMR registers. This bit only controls the direction of the clock, while the parent is a muxed input from sci-clk [1] which may be a configurable PLL or a master clock from one of the McASP instances. Link: http://downloads.ti.com/tisci/esd/latest/5_soc_doc/am62x/clocks.html#clocks-for-board0-device [1] Signed-off-by: Jai Luthra <j-luthra@ti.com> --- drivers/clk/keystone/syscon-clk.c | 43 ++++++++++++++++++++++++++++++++++----- 1 file changed, 38 insertions(+), 5 deletions(-)