Re: [alsa-devel] [PATCH] ASoC: samsung: odroid: Drop requirement of clocks in the sound node

On Fri, Aug 04, 2017 at 12:58:17PM +0200, Sylwester Nawrocki wrote:

As suggested in reviews the requirement of clocks in the 'sound' node is dropped and instead a leaf clock is used to configure frequency of the audio root clock PLL. This can work now after the clock tree definitions have been updated to allow clock rate setting propagation on the path from the I2S controller up to the EPLL.

This patch also lowers the CODEC master clock frequency so as to not exceed the maximum allowed 60 MHz at maximum audio sampling rates.

Signed-off-by: Sylwester Nawrocki s.nawrocki@samsung.com

.../devicetree/bindings/sound/samsung,odroid.txt | 6 --- sound/soc/samsung/odroid.c | 44 +++++++++++++++------- 2 files changed, 30 insertions(+), 20 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/samsung,odroid.txt b/Documentation/devicetree/bindings/sound/samsung,odroid.txt index c30934d..625b1b1 100644 --- a/Documentation/devicetree/bindings/sound/samsung,odroid.txt +++ b/Documentation/devicetree/bindings/sound/samsung,odroid.txt @@ -7,9 +7,6 @@ Required properties:

• model - the user-visible name of this sound complex
• clocks - should contain entries matching clock names in the clock-names property
• • clock-names - should contain following entries:
• • "epll" - indicating the EPLL output clock
• • "i2s_rclk" - indicating the RCLK (root) clock of the I2S0 controller
  • samsung,audio-widgets - this property specifies off-codec audio elements
  like headphones or speakers, for details see widgets.txt
  • samsung,audio-routing - a list of the connections between audio

@@ -46,9 +43,6 @@ sound { "IN1", "Mic Jack", "Mic Jack", "MICBIAS";

• clocks = <&clock CLK_FOUT_EPLL>, <&i2s0 CLK_I2S_RCLK_SRC>;
• clock-names = "epll", "sclk_i2s";
• cpu { sound-dai = <&i2s0 0>; };

diff --git a/sound/soc/samsung/odroid.c b/sound/soc/samsung/odroid.c index 0834319..44b6de5 100644 --- a/sound/soc/samsung/odroid.c +++ b/sound/soc/samsung/odroid.c @@ -19,8 +19,8 @@ struct odroid_priv { struct snd_soc_card card; struct snd_soc_dai_link dai_link;

• struct clk *pll;
• struct clk *rclk;

• struct clk *clk_i2s_bus;
• struct clk *sclk_i2s;

};

static int odroid_card_startup(struct snd_pcm_substream *substream) @@ -58,13 +58,18 @@ static int odroid_card_hw_params(struct snd_pcm_substream *substream, return -EINVAL; }

• ret = clk_set_rate(priv->pll, pll_freq + 1);

• ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1); if (ret < 0) return ret;

• rclk_freq = params_rate(params) * 256 * 4;

• /*

• *  We add 1 to the rclk_freq value in order to avoid too low clock
  

• *  frequency values due to the EPLL output frequency not being exact
  

• *  multiple of the audio sampling rate.
  

• */
  

• rclk_freq = params_rate(params) * 256 + 1;

• ret = clk_set_rate(priv->rclk, rclk_freq);

• ret = clk_set_rate(priv->sclk_i2s, rclk_freq); if (ret < 0) return ret;

@@ -118,14 +123,6 @@ static int odroid_audio_probe(struct platform_device *pdev)

snd_soc_card_set_drvdata(card, priv);

• priv->pll = devm_clk_get(dev, "epll");
• if (IS_ERR(priv->pll))

• return PTR_ERR(priv->pll);
  

• priv->rclk = devm_clk_get(dev, "i2s_rclk");
• if (IS_ERR(priv->rclk))

• return PTR_ERR(priv->rclk);
  

• ret = snd_soc_of_parse_card_name(card, "model"); if (ret < 0) return ret;

@@ -171,14 +168,31 @@ static int odroid_audio_probe(struct platform_device *pdev) link->name = "Primary"; link->stream_name = link->name;

One blank line too much but beside that:

Acked-by: Krzysztof Kozlowski krzk@kernel.org

Best regards, Krzysztof

• priv->sclk_i2s = of_clk_get_by_name(link->cpu_of_node, "i2s_opclk1");
• if (IS_ERR(priv->sclk_i2s)) {

• ret = PTR_ERR(priv->sclk_i2s);
  

• goto err_put_i2s_n;
  

• }
• priv->clk_i2s_bus = of_clk_get_by_name(link->cpu_of_node, "iis");
• if (IS_ERR(priv->clk_i2s_bus)) {

• ret = PTR_ERR(priv->clk_i2s_bus);
  

• goto err_put_sclk;
  

• }
• ret = devm_snd_soc_register_card(dev, card); if (ret < 0) { dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);

• goto err_put_i2s_n;
  

• goto err_put_clk_i2s;
  

  }

  return 0;

+err_put_clk_i2s:

• clk_put(priv->clk_i2s_bus);

+err_put_sclk:

• clk_put(priv->sclk_i2s);

err_put_i2s_n: of_node_put(link->cpu_of_node); err_put_codec_n: @@ -192,6 +206,8 @@ static int odroid_audio_remove(struct platform_device *pdev)

of_node_put(priv->dai_link.cpu_of_node); odroid_put_codec_of_nodes(&priv->dai_link);

• clk_put(priv->sclk_i2s);

• clk_put(priv->clk_i2s_bus);

  return 0;

}

1.9.1