[alsa-devel] [PATCH] ASoC: da7219: Add common clock usage for providing DAI clks
Adam Thomson
Adam.Thomson.Opensource at diasemi.com
Fri Mar 9 17:25:43 CET 2018
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 at diasemi.com>
---
Documentation/devicetree/bindings/sound/da7219.txt | 6 +
include/sound/da7219.h | 2 +
sound/soc/codecs/da7219.c | 129 +++++++++++++++++++--
sound/soc/codecs/da7219.h | 9 ++
4 files changed, 138 insertions(+), 8 deletions(-)
diff --git a/Documentation/devicetree/bindings/sound/da7219.txt b/Documentation/devicetree/bindings/sound/da7219.txt
index 5b54d2d..c3df92d 100644
--- a/Documentation/devicetree/bindings/sound/da7219.txt
+++ b/Documentation/devicetree/bindings/sound/da7219.txt
@@ -25,6 +25,9 @@ Optional properties:
interrupt is to be used to wake system, otherwise "irq" should be used.
- wakeup-source: Flag to indicate this device can wake system (suspend/resume).
+- #clock-cells : Should be set to '<0>', only one clock source provided;
+- clock-output-names : Name given for DAI clocks output;
+
- clocks : phandle and clock specifier for codec MCLK.
- clock-names : Clock name string for 'clocks' attribute, should be "mclk".
@@ -83,6 +86,9 @@ Example:
VDDMIC-supply = <®_audio>;
VDDIO-supply = <®_audio>;
+ #clock-cells = <0>;
+ clock-output-names = "dai-clks";
+
clocks = <&clks 201>;
clock-names = "mclk";
diff --git a/include/sound/da7219.h b/include/sound/da7219.h
index 409ef139..1bfcb16 100644
--- a/include/sound/da7219.h
+++ b/include/sound/da7219.h
@@ -36,6 +36,8 @@ enum da7219_mic_amp_in_sel {
struct da7219_pdata {
bool wakeup_source;
+ const char *dai_clks_name;
+
/* Mic */
enum da7219_micbias_voltage micbias_lvl;
enum da7219_mic_amp_in_sel mic_amp_in_sel;
diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c
index 5e043d0..4412159 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);
}
diff --git a/sound/soc/codecs/da7219.h b/sound/soc/codecs/da7219.h
index 1acb34c..1b00023 100644
--- a/sound/soc/codecs/da7219.h
+++ b/sound/soc/codecs/da7219.h
@@ -14,6 +14,9 @@
#ifndef __DA7219_H
#define __DA7219_H
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <sound/da7219.h>
@@ -813,6 +816,12 @@ struct da7219_priv {
struct mutex ctrl_lock;
struct mutex pll_lock;
+#ifdef CONFIG_COMMON_CLK
+ struct clk_hw dai_clks_hw;
+#endif
+ struct clk_lookup *dai_clks_lookup;
+ struct clk *dai_clks;
+
struct clk *mclk;
unsigned int mclk_rate;
int clk_src;
--
1.9.1
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