From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
ak4642 chip can output clock via MCKO pin as audio reference clock. This patch supports it on DT
Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com --- Documentation/devicetree/bindings/sound/ak4642.txt | 22 +++- sound/soc/codecs/ak4642.c | 141 ++++++++++++++------- 2 files changed, 114 insertions(+), 49 deletions(-)
diff --git a/Documentation/devicetree/bindings/sound/ak4642.txt b/Documentation/devicetree/bindings/sound/ak4642.txt index 623d4e7..340784d 100644 --- a/Documentation/devicetree/bindings/sound/ak4642.txt +++ b/Documentation/devicetree/bindings/sound/ak4642.txt @@ -7,7 +7,14 @@ Required properties: - compatible : "asahi-kasei,ak4642" or "asahi-kasei,ak4643" or "asahi-kasei,ak4648" - reg : The chip select number on the I2C bus
-Example: +Optional properties: + + - #clock-cells : common clock binding; shall be set to 0 + - clocks : common clock binding; MCKI clock + - clock-frequency : common clock binding; frequency of MCKO + - clock-output-names : common clock binding; MCKO clock name + +Example 1:
&i2c { ak4648: ak4648@0x12 { @@ -15,3 +22,16 @@ Example: reg = <0x12>; }; }; + +Example 2: + +&i2c { + ak4643: codec@12 { + compatible = "asahi-kasei,ak4643"; + reg = <0x12>; + #clock-cells = <0>; + clocks = <&audio_clock>; + clock-frequency = <12288000>; + clock-output-names = "ak4643_mcko"; + }; +}; diff --git a/sound/soc/codecs/ak4642.c b/sound/soc/codecs/ak4642.c index 9af06d3..b5c4981 100644 --- a/sound/soc/codecs/ak4642.c +++ b/sound/soc/codecs/ak4642.c @@ -23,6 +23,8 @@ * AK4648 is tested. */
+#include <linux/clk.h> +#include <linux/clk-provider.h> #include <linux/delay.h> #include <linux/i2c.h> #include <linux/slab.h> @@ -128,11 +130,8 @@ #define I2S (3 << 0)
/* MD_CTL2 */ -#define FS0 (1 << 0) -#define FS1 (1 << 1) -#define FS2 (1 << 2) -#define FS3 (1 << 5) -#define FS_MASK (FS0 | FS1 | FS2 | FS3) +#define FS(val) (((val & 0x7) << 0) | ((val & 0x8) << 2)) +#define PS(val) ((val & 0x3) << 6)
/* MD_CTL3 */ #define BST1 (1 << 3) @@ -147,6 +146,7 @@ struct ak4642_drvdata {
struct ak4642_priv { const struct ak4642_drvdata *drvdata; + struct clk *mcko; };
/* @@ -430,56 +430,55 @@ static int ak4642_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) return 0; }
+static int ak4642_set_mcko(struct snd_soc_codec *codec, + u32 frequency) +{ + u32 fs_list[] = { + [0] = 8000, + [1] = 12000, + [2] = 16000, + [3] = 24000, + [4] = 7350, + [5] = 11025, + [6] = 14700, + [7] = 22050, + [10] = 32000, + [11] = 48000, + [14] = 29400, + [15] = 44100, + }; + u32 ps_list[] = { + [0] = 256, + [1] = 128, + [2] = 64, + [3] = 32 + }; + int ps, fs; + + for (ps = 0; ps < ARRAY_SIZE(ps_list); ps++) { + for (fs = 0; fs < ARRAY_SIZE(fs_list); fs++) { + if (frequency == ps_list[ps] * fs_list[fs]) { + snd_soc_write(codec, MD_CTL2, PS(ps) | FS(fs)); + return 0; + } + } + } + + return 0; +} + static int ak4642_dai_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct snd_soc_codec *codec = dai->codec; - u8 rate; + struct ak4642_priv *priv = snd_soc_codec_get_drvdata(codec); + u32 rate = clk_get_rate(priv->mcko);
- switch (params_rate(params)) { - case 7350: - rate = FS2; - break; - case 8000: - rate = 0; - break; - case 11025: - rate = FS2 | FS0; - break; - case 12000: - rate = FS0; - break; - case 14700: - rate = FS2 | FS1; - break; - case 16000: - rate = FS1; - break; - case 22050: - rate = FS2 | FS1 | FS0; - break; - case 24000: - rate = FS1 | FS0; - break; - case 29400: - rate = FS3 | FS2 | FS1; - break; - case 32000: - rate = FS3 | FS1; - break; - case 44100: - rate = FS3 | FS2 | FS1 | FS0; - break; - case 48000: - rate = FS3 | FS1 | FS0; - break; - default: - return -EINVAL; - } - snd_soc_update_bits(codec, MD_CTL2, FS_MASK, rate); + if (!rate) + rate = params_rate(params) * 256;
- return 0; + return ak4642_set_mcko(codec, rate); }
static int ak4642_set_bias_level(struct snd_soc_codec *codec, @@ -532,7 +531,18 @@ static int ak4642_resume(struct snd_soc_codec *codec) return 0; }
+static int ak4642_probe(struct snd_soc_codec *codec) +{ + struct ak4642_priv *priv = snd_soc_codec_get_drvdata(codec); + + if (priv->mcko) + ak4642_set_mcko(codec, clk_get_rate(priv->mcko)); + + return 0; +} + static struct snd_soc_codec_driver soc_codec_dev_ak4642 = { + .probe = ak4642_probe, .resume = ak4642_resume, .set_bias_level = ak4642_set_bias_level, .controls = ak4642_snd_controls, @@ -580,6 +590,35 @@ static const struct ak4642_drvdata ak4648_drvdata = { .extended_frequencies = 1, };
+#ifdef CONFIG_COMMON_CLK +static struct clk *ak4642_of_parse_mcko(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct clk *clk; + const char *clk_name = np->name; + const char *parent_clk_name = NULL; + u32 rate; + + if (of_property_read_u32(np, "clock-frequency", &rate)) + return NULL; + + if (of_property_read_bool(np, "clocks")) + parent_clk_name = of_clk_get_parent_name(np, 0); + + of_property_read_string(np, "clock-output-names", &clk_name); + + clk = clk_register_fixed_rate(dev, clk_name, parent_clk_name, + (parent_clk_name) ? 0 : CLK_IS_ROOT, + rate); + if (!IS_ERR(clk)) + of_clk_add_provider(np, of_clk_src_simple_get, clk); + + return clk; +} +#else +#define ak4642_of_parse_mcko(d) 0 +#endif + static const struct of_device_id ak4642_of_match[]; static int ak4642_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) @@ -589,10 +628,15 @@ static int ak4642_i2c_probe(struct i2c_client *i2c, const struct ak4642_drvdata *drvdata = NULL; struct regmap *regmap; struct ak4642_priv *priv; + struct clk *mcko = NULL;
if (np) { const struct of_device_id *of_id;
+ mcko = ak4642_of_parse_mcko(dev); + if (IS_ERR(mcko)) + mcko = NULL; + of_id = of_match_device(ak4642_of_match, dev); if (of_id) drvdata = of_id->data; @@ -610,6 +654,7 @@ static int ak4642_i2c_probe(struct i2c_client *i2c, return -ENOMEM;
priv->drvdata = drvdata; + priv->mcko = mcko;
i2c_set_clientdata(i2c, priv);