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authorAdam Thomson <Adam.Thomson.Opensource@diasemi.com>2018-03-09 19:25:43 +0300
committerMark Brown <broonie@kernel.org>2018-03-09 20:40:41 +0300
commitfc8f7ea2d6c074baaad202c9187962bfa493ef13 (patch)
tree44dea6701558da4ca58f5c89309451b9c5155506 /sound/soc/codecs/da7219.c
parentc22969d70fc9253112e88da55116e04074cdeac4 (diff)
downloadlinux-fc8f7ea2d6c074baaad202c9187962bfa493ef13.tar.xz
ASoC: da7219: Add common clock usage for providing DAI clks
There is a need to use DA7219 as DAI clock master for other codecs within a system, which means that the DAI clocks are required to remain, regardless of whether the codec is actually running playback/capture. To be able to expose control of the DAI clocking the common clock framework has been employed. The current implementation adds a simple clock gate for enabling and disabling the DAI clocks, with no rate control supported (this is still handled through standard hw_params() functions as before). If DT is enabled then the clock is added to the OF providers list, otherwise a clkdev lookup is used. Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/codecs/da7219.c')
-rw-r--r--sound/soc/codecs/da7219.c129
1 files changed, 121 insertions, 8 deletions
diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c
index 5e043d082f4b..441215997273 100644
--- a/sound/soc/codecs/da7219.c
+++ b/sound/soc/codecs/da7219.c
@@ -13,6 +13,8 @@
#include <linux/acpi.h>
#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
#include <linux/i2c.h>
#include <linux/of_device.h>
#include <linux/property.h>
@@ -772,16 +774,27 @@ static int da7219_dai_event(struct snd_soc_dapm_widget *w,
struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
struct da7219_priv *da7219 = snd_soc_component_get_drvdata(component);
u8 pll_ctrl, pll_status;
- int i = 0;
+ int i = 0, ret;
bool srm_lock = false;
switch (event) {
case SND_SOC_DAPM_PRE_PMU:
- if (da7219->master)
+ if (da7219->master) {
/* Enable DAI clks for master mode */
- snd_soc_component_update_bits(component, DA7219_DAI_CLK_MODE,
- DA7219_DAI_CLK_EN_MASK,
- DA7219_DAI_CLK_EN_MASK);
+ if (da7219->dai_clks) {
+ ret = clk_prepare_enable(da7219->dai_clks);
+ if (ret) {
+ dev_err(component->dev,
+ "Failed to enable dai_clks\n");
+ return ret;
+ }
+ } else {
+ snd_soc_component_update_bits(component,
+ DA7219_DAI_CLK_MODE,
+ DA7219_DAI_CLK_EN_MASK,
+ DA7219_DAI_CLK_EN_MASK);
+ }
+ }
/* PC synchronised to DAI */
snd_soc_component_update_bits(component, DA7219_PC_COUNT,
@@ -814,9 +827,16 @@ static int da7219_dai_event(struct snd_soc_dapm_widget *w,
DA7219_PC_FREERUN_MASK);
/* Disable DAI clks if in master mode */
- if (da7219->master)
- snd_soc_component_update_bits(component, DA7219_DAI_CLK_MODE,
- DA7219_DAI_CLK_EN_MASK, 0);
+ if (da7219->master) {
+ if (da7219->dai_clks)
+ clk_disable_unprepare(da7219->dai_clks);
+ else
+ snd_soc_component_update_bits(component,
+ DA7219_DAI_CLK_MODE,
+ DA7219_DAI_CLK_EN_MASK,
+ 0);
+ }
+
return 0;
default:
return -EINVAL;
@@ -1598,6 +1618,12 @@ static struct da7219_pdata *da7219_fw_to_pdata(struct snd_soc_component *compone
pdata->wakeup_source = device_property_read_bool(dev, "wakeup-source");
+ pdata->dai_clks_name = "da7219-dai-clks";
+ if (device_property_read_string(dev, "clock-output-names",
+ &pdata->dai_clks_name))
+ dev_warn(dev, "Using default clk name: %s\n",
+ pdata->dai_clks_name);
+
if (device_property_read_u32(dev, "dlg,micbias-lvl", &of_val32) >= 0)
pdata->micbias_lvl = da7219_fw_micbias_lvl(dev, of_val32);
else
@@ -1712,6 +1738,88 @@ static int da7219_handle_supplies(struct snd_soc_component *component)
return 0;
}
+#ifdef CONFIG_COMMON_CLK
+static int da7219_dai_clks_prepare(struct clk_hw *hw)
+{
+ struct da7219_priv *da7219 =
+ container_of(hw, struct da7219_priv, dai_clks_hw);
+ struct snd_soc_component *component = da7219->aad->component;
+
+ snd_soc_component_update_bits(component, DA7219_DAI_CLK_MODE,
+ DA7219_DAI_CLK_EN_MASK,
+ DA7219_DAI_CLK_EN_MASK);
+
+ return 0;
+}
+
+static void da7219_dai_clks_unprepare(struct clk_hw *hw)
+{
+ struct da7219_priv *da7219 =
+ container_of(hw, struct da7219_priv, dai_clks_hw);
+ struct snd_soc_component *component = da7219->aad->component;
+
+ snd_soc_component_update_bits(component, DA7219_DAI_CLK_MODE,
+ DA7219_DAI_CLK_EN_MASK, 0);
+}
+
+static int da7219_dai_clks_is_prepared(struct clk_hw *hw)
+{
+ struct da7219_priv *da7219 =
+ container_of(hw, struct da7219_priv, dai_clks_hw);
+ struct snd_soc_component *component = da7219->aad->component;
+ u8 clk_reg;
+
+ clk_reg = snd_soc_component_read32(component, DA7219_DAI_CLK_MODE);
+
+ return !!(clk_reg & DA7219_DAI_CLK_EN_MASK);
+}
+
+const struct clk_ops da7219_dai_clks_ops = {
+ .prepare = da7219_dai_clks_prepare,
+ .unprepare = da7219_dai_clks_unprepare,
+ .is_prepared = da7219_dai_clks_is_prepared,
+};
+
+static void da7219_register_dai_clks(struct snd_soc_component *component)
+{
+ struct device *dev = component->dev;
+ struct da7219_priv *da7219 = snd_soc_component_get_drvdata(component);
+ struct da7219_pdata *pdata = da7219->pdata;
+ struct clk_init_data init = {};
+ struct clk *dai_clks;
+ struct clk_lookup *dai_clks_lookup;
+
+ init.parent_names = NULL;
+ init.num_parents = 0;
+ init.name = pdata->dai_clks_name;
+ init.ops = &da7219_dai_clks_ops;
+ da7219->dai_clks_hw.init = &init;
+
+ dai_clks = devm_clk_register(dev, &da7219->dai_clks_hw);
+ if (IS_ERR(dai_clks)) {
+ dev_warn(dev, "Failed to register DAI clocks: %ld\n",
+ PTR_ERR(dai_clks));
+ return;
+ }
+ da7219->dai_clks = dai_clks;
+
+ /* If we're using DT, then register as provider accordingly */
+ if (dev->of_node) {
+ devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
+ &da7219->dai_clks_hw);
+ } else {
+ dai_clks_lookup = clkdev_create(dai_clks, pdata->dai_clks_name,
+ "%s", dev_name(dev));
+ if (!dai_clks_lookup)
+ dev_warn(dev, "Failed to create DAI clkdev");
+ else
+ da7219->dai_clks_lookup = dai_clks_lookup;
+ }
+}
+#else
+static inline void da7219_register_dai_clks(struct snd_soc_component *component) {}
+#endif /* CONFIG_COMMON_CLK */
+
static void da7219_handle_pdata(struct snd_soc_component *component)
{
struct da7219_priv *da7219 = snd_soc_component_get_drvdata(component);
@@ -1722,6 +1830,8 @@ static void da7219_handle_pdata(struct snd_soc_component *component)
da7219->wakeup_source = pdata->wakeup_source;
+ da7219_register_dai_clks(component);
+
/* Mic Bias voltages */
switch (pdata->micbias_lvl) {
case DA7219_MICBIAS_1_6V:
@@ -1856,6 +1966,9 @@ static void da7219_remove(struct snd_soc_component *component)
da7219_aad_exit(component);
+ if (da7219->dai_clks_lookup)
+ clkdev_drop(da7219->dai_clks_lookup);
+
/* Supplies */
regulator_bulk_disable(DA7219_NUM_SUPPLIES, da7219->supplies);
}