ASoC: amd: add acp6.2 pdm platform driver

PDM platform driver binds to the platform device created by
ACP6.2 PCI device. PDM driver registers ALSA DMA and CPU DAI
components with ASoC framework.
Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@amd.com>
Reviewed-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Link: https://lore.kernel.org/r/20220827165657.2343818-6-Syed.SabaKareem@amd.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/ps/acp62.h

@@ -44,6 +44,11 @@ enum acp_config {
 	ACP_CONFIG_15,
 };
 
+struct pdm_dev_data {
+	void __iomem *acp62_base;
+	struct snd_pcm_substream *capture_stream;
+};
+
 static inline u32 acp62_readl(void __iomem *base_addr)
 {
 	return readl(base_addr);

sound/soc/amd/ps/ps-pdm-dma.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AMD ALSA SoC Pink Sardine PDM Driver
+ *
+ * Copyright 2022 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "acp62.h"
+
+#define DRV_NAME "acp_ps_pdm_dma"
+
+static struct snd_soc_dai_driver acp62_pdm_dai_driver = {
+	.name = "acp_ps_pdm_dma.0",
+	.capture = {
+		.rates = SNDRV_PCM_RATE_48000,
+		.formats = SNDRV_PCM_FMTBIT_S32_LE,
+		.channels_min = 2,
+		.channels_max = 2,
+		.rate_min = 48000,
+		.rate_max = 48000,
+	},
+};
+
+static const struct snd_soc_component_driver acp62_pdm_component = {
+	.name		= DRV_NAME,
+};
+
+static int acp62_pdm_audio_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct pdm_dev_data *adata;
+	int status;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
+		return -ENODEV;
+	}
+
+	adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
+	if (!adata)
+		return -ENOMEM;
+
+	adata->acp62_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!adata->acp62_base)
+		return -ENOMEM;
+
+	adata->capture_stream = NULL;
+
+	dev_set_drvdata(&pdev->dev, adata);
+	status = devm_snd_soc_register_component(&pdev->dev,
+						 &acp62_pdm_component,
+						 &acp62_pdm_dai_driver, 1);
+	if (status) {
+		dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
+
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static struct platform_driver acp62_pdm_dma_driver = {
+	.probe = acp62_pdm_audio_probe,
+	.driver = {
+		.name = "acp_ps_pdm_dma",
+	},
+};
+
+module_platform_driver(acp62_pdm_dma_driver);
+
+MODULE_AUTHOR("Syed.SabaKareem@amd.com");
+MODULE_DESCRIPTION("AMD PINK SARDINE PDM Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);