Add support for a master clock passed through DT. The master clock of the codec is only active when the codec is in use.
Cc: Rob Herring <[email protected]> Cc: Pawel Moll <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Ian Campbell <[email protected]> Cc: Kumar Gala <[email protected]> Cc: [email protected] Signed-off-by: Markus Pargmann <[email protected]> --- .../devicetree/bindings/sound/tlv320aic32x4.txt | 2 ++ sound/soc/codecs/tlv320aic32x4.c | 23 ++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/Documentation/devicetree/bindings/sound/tlv320aic32x4.txt b/Documentation/devicetree/bindings/sound/tlv320aic32x4.txt index 5c8fb4a..4ed7c37 100644 --- a/Documentation/devicetree/bindings/sound/tlv320aic32x4.txt +++ b/Documentation/devicetree/bindings/sound/tlv320aic32x4.txt @@ -10,6 +10,8 @@ Optional properties: - ti,ldo-enable: Bool, has to be set when the codec is powered only through the LDOIN pin. - gpio-reset - gpio pin number used for codec reset + - clocks/clock-names: Clock named 'mclk' for the master clock of the codec. + See clock/clock-bindings.txt for information about the detailed format. Example: diff --git a/sound/soc/codecs/tlv320aic32x4.c b/sound/soc/codecs/tlv320aic32x4.c index 840f529..33ab004 100644 --- a/sound/soc/codecs/tlv320aic32x4.c +++ b/sound/soc/codecs/tlv320aic32x4.c @@ -33,6 +33,7 @@ #include <linux/i2c.h> #include <linux/cdev.h> #include <linux/slab.h> +#include <linux/clk.h> #include <sound/tlv320aic32x4.h> #include <sound/core.h> @@ -67,6 +68,7 @@ struct aic32x4_priv { u32 micpga_routing; bool swapdacs; int rstn_gpio; + struct clk *mclk; }; /* 0dB min, 0.5dB steps */ @@ -487,8 +489,21 @@ static int aic32x4_mute(struct snd_soc_dai *dai, int mute) static int aic32x4_set_bias_level(struct snd_soc_codec *codec, enum snd_soc_bias_level level) { + struct aic32x4_priv *aic32x4 = snd_soc_codec_get_drvdata(codec); + switch (level) { case SND_SOC_BIAS_ON: + /* Switch on master clock */ + if (!IS_ERR(aic32x4->mclk)) { + int ret; + + ret = clk_prepare_enable(aic32x4->mclk); + if (ret) { + dev_err(codec->dev, "Failed to enable master clock\n"); + return ret; + } + } + /* Switch on PLL */ snd_soc_update_bits(codec, AIC32X4_PLLPR, AIC32X4_PLLEN, AIC32X4_PLLEN); @@ -516,6 +531,10 @@ static int aic32x4_set_bias_level(struct snd_soc_codec *codec, case SND_SOC_BIAS_PREPARE: break; case SND_SOC_BIAS_STANDBY: + /* Switch off master clock */ + if (!IS_ERR(aic32x4->mclk)) + clk_disable_unprepare(aic32x4->mclk); + /* Switch off PLL */ snd_soc_update_bits(codec, AIC32X4_PLLPR, AIC32X4_PLLEN, 0); @@ -722,6 +741,10 @@ static int aic32x4_i2c_probe(struct i2c_client *i2c, aic32x4->rstn_gpio = -1; } + aic32x4->mclk = devm_clk_get(&i2c->dev, "mclk"); + if (IS_ERR(aic32x4->mclk)) + dev_info(&i2c->dev, "No mclk found, continuing without clock\n"); + if (gpio_is_valid(aic32x4->rstn_gpio)) { ret = devm_gpio_request_one(&i2c->dev, aic32x4->rstn_gpio, GPIOF_OUT_INIT_LOW, "tlv320aic32x4 rstn"); -- 1.8.5.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
