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Date: Tue, 9 Aug 2022 11:47:24 +0300
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Martin Povišer <povik+lin@...ebit.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
Philipp Zabel <p.zabel@...gutronix.de>
Cc: asahi@...ts.linux.dev, alsa-devel@...a-project.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ASoC: apple: mca: Start new platform driver
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@...ebit.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
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