[alsa-devel] [PATCH V2 1/2] ASoC: samsung: Add machine driver for Odroid X2/U3

On 25/06/14 05:31, Tushar Behera wrote:

On 06/18/2014 09:52 PM, Sylwester Nawrocki wrote:

quoted

This patch adds the sound subsystem driver for Odroid-X2 and
Odroid-U3 boards. The codec works in I2S master mode; there are
2 separate audio routing paths defined as there are differences
in the signal routing between the X2 and U3 boards, i.e. U3 uses
single jack for headphones and microphone.

Signed-off-by: Chen Zhen <redacted>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
 sound/soc/samsung/Kconfig             |    8 ++
 sound/soc/samsung/Makefile            |    2 +
 sound/soc/samsung/odroidx2_max98090.c |  191 +++++++++++++++++++++++++++++++++
 3 files changed, 201 insertions(+)
 create mode 100644 sound/soc/samsung/odroidx2_max98090.c

[ ... ]

quoted

+static int odroidx2_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	int ret;
+
+	ret = snd_soc_dai_set_sysclk(codec_dai, 0, MAX98090_MCLK,
+						SND_SOC_CLOCK_IN);
+	if (ret < 0) {
+		dev_err(codec_dai->dev,
+			"Unable to switch to FLL1: %d\n", ret);
+		return ret;
+	}
+
+	/* Set the cpu DAI configuration in order to use CDCLK */
+	ret = snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_CDCLK,
+					0, SND_SOC_CLOCK_OUT);
+	if (ret < 0)
+		return ret;
+

While upstreaming sound-card driver for Snow board, I had a comment from
Mark to move this to probe, if possible. That way, the clock operations
would be done only once and this function and odroidx2_ops can be
removed altogether.

Thanks for the suggestion, I'll change it for the next iteration.

quoted

+	dev_dbg(codec_dai->dev, "HiFi DAI %s params: channels: %d, rate: %d\n",
+		snd_pcm_stream_str(substream), params_channels(params),
+		params_rate(params));
+
+	return 0;
+}
+
+static struct snd_soc_ops odroidx2_ops = {
+	.hw_params	= odroidx2_hw_params,
+};
+

[ ... ]

quoted

+
+	ret = snd_soc_register_card(card);

devm_snd_soc_register_card ?

Could be, although snd_soc_unregister_card() wouldn't release references
to the OF nodes, i.e. there would be no related of_node_put() calls.
And for correctness, the of_node_put() calls should be made _after_
a snd_soc_unregister_card() call, and I can't see how it could be possible
if I left only of_node_put() calls in the odroidx2_audio_remove() callback.

quoted

+	if (ret) {
+		dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret);
+		goto err_put_cpu_n;
+	}
+
+	return 0;
+
+err_put_cpu_n:
+	of_node_put(odroidx2_dai[0].cpu_of_node);
+err_put_cod_n:
+	of_node_put(odroidx2_dai[0].codec_of_node);
+	return ret;
+}
+
+static int odroidx2_audio_remove(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = platform_get_drvdata(pdev);
+
+	snd_soc_unregister_card(card);

This can be removed when devm_snd_soc_register_card is used.

--
Regards,
Sylwester