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 --- 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;