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@xxxxxxxxxxx>
> ---
> .../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@xxxxxxxxxx>
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
>
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