linux-kernel - Re: [PATCH 2/2] spi: atcspi200: Add ATCSPI200 SPI driver

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Message-ID: <73a39371-5bf0-4a3d-a48b-9e91668b779c@kernel.org>
Date: Fri, 14 Nov 2025 12:58:41 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: CL Wang <cl634@...estech.com>, broonie@...nel.org,
 linux-spi@...r.kernel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 tim609@...estech.com
Subject: Re: [PATCH 2/2] spi: atcspi200: Add ATCSPI200 SPI driver

On 12/11/2025 04:47, CL Wang wrote:
> +
> +static int atcspi_enable_clk(struct atcspi_dev *spi)
> +{
> +	int ret;
> +
> +	ret = clk_prepare_enable(spi->clk);
> +	if (ret)
> +		return dev_err_probe(spi->dev, ret,
> +				     "Failed to enable clock\n");
> +
> +	spi->clk_rate = clk_get_rate(spi->clk);
> +	if (!spi->clk_rate)
> +		return dev_err_probe(spi->dev, -EINVAL,
> +				     "Failed to get SPI clock rate\n");

You miss clock enable/prepare cleanup. In other places as well.
 > +
> +	return 0;
> +}
> +
> +static void atcspi_init_controller(struct platform_device *pdev,
> +				   struct atcspi_dev *spi,
> +				   struct spi_controller *host,
> +				   struct resource *mem_res)
> +{
> +	/* Get the physical address of the data register for DMA transfers. */
> +	spi->dma_addr = (dma_addr_t)(mem_res->start + ATCSPI_DATA);
> +
> +	/* Initialize controller properties */
> +	host->bus_num = pdev->id;
> +	host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_QUAD | SPI_TX_QUAD;
> +	host->dev.of_node = pdev->dev.of_node;
> +	host->num_chipselect = ATCSPI_MAX_CS_NUM;
> +	host->mem_ops = &atcspi_mem_ops;
> +	host->max_speed_hz = spi->sclk_rate;
> +}
> +
> +static int atcspi_probe(struct platform_device *pdev)
> +{
> +	struct spi_controller *host;
> +	struct atcspi_dev *spi;
> +	struct resource *mem_res;
> +	int ret;
> +
> +	host = spi_alloc_host(&pdev->dev, sizeof(*spi));
> +	if (!host)
> +		return -ENOMEM;
> +
> +	spi = spi_controller_get_devdata(host);
> +	spi->host = host;
> +	spi->dev = &pdev->dev;
> +	platform_set_drvdata(pdev, host);
> +
> +	ret = atcspi_init_resources(pdev, spi, &mem_res);
> +	if (ret)
> +		goto free_controller;
> +
> +	ret = atcspi_enable_clk(spi);
> +	if (ret)
> +		goto free_controller;
> +
> +	atcspi_init_controller(pdev, spi, host, mem_res);
> +
> +	ret = atcspi_setup(spi);
> +	if (ret)
> +		goto free_controller;
> +
> +	ret = devm_spi_register_controller(&pdev->dev, host);
> +	if (ret) {
> +		dev_err_probe(spi->dev, ret,
> +			      "Failed to register SPI controller\n");
> +		goto free_controller;
> +	}
> +
> +	spi->use_dma = false;
> +	if (ATCSPI_DMA_SUPPORT) {
> +		ret = atcspi_configure_dma(spi);
> +		if (ret)
> +			dev_info(spi->dev,
> +				 "Failed to init DMA, fallback to PIO mode\n");
> +		else
> +			spi->use_dma = true;
> +	}
> +	mutex_init(&spi->mutex_lock);
> +
> +	return 0;
> +
> +free_controller:
> +	spi_controller_put(host);

Where is DMA channel release? Same for unbind path.

> +	return ret;
> +}
> +
> +static const struct of_device_id atcspi_of_match[] = {
> +	{ .compatible = "andestech,qilai-spi", },
> +	{ .compatible = "andestech,atcspi200", },

Where did you document this compatible/ABI?


Best regards,
Krzysztof