Re: [PATCH 2/3] ASoC: apple: mca: Start new platform driver

[Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>]

On 09/08/2022 01:41, Martin Povišer wrote:
> Add ASoC platform driver for the MCA peripheral found on Apple M1 and
> other chips.
> 
> Signed-off-by: Martin Povišer <povik+lin@cutebit.org>


> +static int apple_mca_probe(struct platform_device *pdev)
> +{
> +	struct mca_data *mca;
> +	struct mca_cluster *clusters;
> +	struct snd_soc_dai_driver *dai_drivers;
> +	struct resource *res;
> +	void __iomem *base;
> +	int nclusters;
> +	int ret, i;
> +
> +	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	if (resource_size(res) < CLUSTER_STRIDE)
> +		return -EINVAL;
> +	nclusters = (resource_size(res) - CLUSTER_STRIDE) / CLUSTER_STRIDE + 1;
> +
> +	mca = devm_kzalloc(&pdev->dev, struct_size(mca, clusters, nclusters),
> +			   GFP_KERNEL);
> +	if (!mca)
> +		return -ENOMEM;
> +	mca->dev = &pdev->dev;
> +	mca->nclusters = nclusters;
> +	platform_set_drvdata(pdev, mca);
> +	clusters = mca->clusters;
> +
> +	mca->switch_base =
> +		devm_platform_ioremap_resource_byname(pdev, "switch");
> +	if (IS_ERR(mca->switch_base))
> +		return PTR_ERR(mca->switch_base);

How does it work exactly? There is no such property... Can you submit
also DTS using the bindings so we can validate they are real/correct?

> +
> +	mca->rstc = devm_reset_control_get_shared(&pdev->dev, NULL);
> +	if (IS_ERR(mca->rstc)) {
> +		dev_dbg(&pdev->dev, "couldn't obtain reset control: %pe\n", mca->rstc);
> +		mca->rstc = NULL;
> +	}

Similar question.

> +
> +	dai_drivers = devm_kzalloc(
> +		&pdev->dev, sizeof(*dai_drivers) * 2 * nclusters, GFP_KERNEL);
> +	if (!dai_drivers)
> +		return -ENOMEM;
> +
> +	mca->pd_dev = dev_pm_domain_attach_by_id(&pdev->dev, 0);
> +	if (IS_ERR(mca->pd_dev))
> +		return -EINVAL;
> +
> +	mca->pd_link = device_link_add(&pdev->dev, mca->pd_dev,
> +				       DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME |
> +					       DL_FLAG_RPM_ACTIVE);
> +	if (!mca->pd_link) {
> +		ret = -EINVAL;
> +		/* Prevent an unbalanced reset assert */
> +		mca->rstc = NULL;
> +		goto err_release;
> +	}
> +
> +	reset_control_deassert(mca->rstc);
> +
> +	for (i = 0; i < nclusters; i++) {
> +		struct mca_cluster *cl = &clusters[i];
> +		struct snd_soc_dai_driver *fe =
> +			&dai_drivers[mca->nclusters + i];
> +		struct snd_soc_dai_driver *be = &dai_drivers[i];
> +		int stream;
> +
> +		cl->host = mca;
> +		cl->no = i;
> +		cl->base = base + CLUSTER_STRIDE * i;
> +		cl->port_driver = -1;
> +		cl->clk_parent = of_clk_get(pdev->dev.of_node, i);
> +		if (IS_ERR(cl->clk_parent)) {
> +			dev_err(&pdev->dev, "unable to obtain clock %d: %ld\n",
> +				i, PTR_ERR(cl->clk_parent));
> +			ret = PTR_ERR(cl->clk_parent);
> +			goto err_release;
> +		}
> +		cl->pd_dev = dev_pm_domain_attach_by_id(&pdev->dev, i + 1);
> +		if (IS_ERR(cl->pd_dev)) {
> +			dev_err(&pdev->dev,
> +				"unable to obtain cluster %d PD: %ld\n", i,
> +				PTR_ERR(cl->pd_dev));
> +			ret = PTR_ERR(cl->pd_dev);
> +			goto err_release;
> +		}
> +
> +		for_each_pcm_streams(stream) {
> +			struct dma_chan *chan;
> +			bool is_tx = (stream == SNDRV_PCM_STREAM_PLAYBACK);
> +#ifndef USE_RXB_FOR_CAPTURE
> +			char *name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
> +						    is_tx ? "tx%da" : "rx%da",
> +						    i);
> +#else
> +			char *name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
> +						    is_tx ? "tx%da" : "rx%db",
> +						    i);
> +#endif
> +
> +			chan = of_dma_request_slave_channel(pdev->dev.of_node,
> +							    name);
> +			if (IS_ERR(chan)) {
> +				if (PTR_ERR(chan) != -EPROBE_DEFER)
> +					dev_err(&pdev->dev,
> +						"no %s DMA channel: %ld\n",
> +						name, PTR_ERR(chan));
> +
> +				ret = PTR_ERR(chan);
> +				goto err_release;
> +			}
> +
> +			cl->dma_chans[stream] = chan;
> +		}
> +
> +		fe->id = i;
> +		fe->name =
> +			devm_kasprintf(&pdev->dev, GFP_KERNEL, "mca-pcm-%d", i);
> +		if (!fe->name) {
> +			ret = -ENOMEM;
> +			goto err_release;
> +		}
> +		fe->ops = &mca_fe_ops;
> +		fe->playback.channels_min = 1;
> +		fe->playback.channels_max = 32;
> +		fe->playback.rates = SNDRV_PCM_RATE_8000_192000;
> +		fe->playback.formats = APPLE_MCA_FMTBITS;
> +		fe->capture.channels_min = 1;
> +		fe->capture.channels_max = 32;
> +		fe->capture.rates = SNDRV_PCM_RATE_8000_192000;
> +		fe->capture.formats = APPLE_MCA_FMTBITS;
> +		fe->symmetric_rate = 1;
> +
> +		fe->playback.stream_name =
> +			devm_kasprintf(&pdev->dev, GFP_KERNEL, "PCM%d TX", i);
> +		fe->capture.stream_name =
> +			devm_kasprintf(&pdev->dev, GFP_KERNEL, "PCM%d RX", i);
> +
> +		if (!fe->playback.stream_name || !fe->capture.stream_name) {
> +			ret = -ENOMEM;
> +			goto err_release;
> +		}
> +
> +		be->id = i + nclusters;
> +		be->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "mca-i2s-%d", i);
> +		if (!be->name) {
> +			ret = -ENOMEM;
> +			goto err_release;
> +		}
> +		be->ops = &mca_be_ops;
> +		be->playback.channels_min = 1;
> +		be->playback.channels_max = 32;
> +		be->playback.rates = SNDRV_PCM_RATE_8000_192000;
> +		be->playback.formats = APPLE_MCA_FMTBITS;
> +		be->capture.channels_min = 1;
> +		be->capture.channels_max = 32;
> +		be->capture.rates = SNDRV_PCM_RATE_8000_192000;
> +		be->capture.formats = APPLE_MCA_FMTBITS;
> +
> +		be->playback.stream_name =
> +			devm_kasprintf(&pdev->dev, GFP_KERNEL, "I2S%d TX", i);
> +		be->capture.stream_name =
> +			devm_kasprintf(&pdev->dev, GFP_KERNEL, "I2S%d RX", i);
> +		if (!be->playback.stream_name || !be->capture.stream_name) {
> +			ret = -ENOMEM;
> +			goto err_release;
> +		}
> +	}
> +
> +	ret = devm_snd_soc_register_component(&pdev->dev, &mca_component,
> +					      dai_drivers, nclusters * 2);
> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to register ASoC component: %d\n",
> +			ret);
> +		goto err_release;
> +	}
> +
> +	return 0;
> +
> +err_release:
> +	apple_mca_release(mca);
> +	return ret;
> +}
> +
> +static int apple_mca_remove(struct platform_device *pdev)
> +{
> +	struct mca_data *mca = platform_get_drvdata(pdev);
> +
> +	apple_mca_release(mca);
> +	return 0;
> +}
> +
> +static const struct of_device_id apple_mca_of_match[] = {
> +	{ .compatible = "apple,mca", },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, apple_mca_of_match);
> +
> +static struct platform_driver apple_mca_driver = {
> +	.driver = {
> +		.name = "apple-mca",
> +		.owner = THIS_MODULE,

No need for this. Run coccinelle.


Best regards,
Krzysztof