linux-kernel - Re: [PATCH v3 3/4] spi: microchip-core-qspi: Add support for microchip fpga qspi controllers

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Message-ID: <fa9fca3b-4b8b-1a51-3e8b-45f1ae2e15df@linaro.org>
Date:   Fri, 5 Aug 2022 08:50:17 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Naga Sureshkumar Relli <nagasuresh.relli@...rochip.com>,
        broonie@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor.dooley@...rochip.com
Cc:     linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Valentina.FernandezAlanis@...rochip.com
Subject: Re: [PATCH v3 3/4] spi: microchip-core-qspi: Add support for
 microchip fpga qspi controllers

On 05/08/2022 07:30, Naga Sureshkumar Relli wrote:
> Add a driver for Microchip FPGA QSPI controllers. This driver also
> supports "hard" QSPI controllers on Polarfire SoC.
> 

Thank you for your patch. There is something to discuss/improve.

> +	ret = clk_prepare_enable(qspi->clk);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "failed to enable clock\n");
> +
> +	init_completion(&qspi->data_completion);
> +	mutex_init(&qspi->op_lock);
> +
> +	qspi->irq = platform_get_irq(pdev, 0);
> +	if (qspi->irq <= 0) {


< 0
Why did you change it to <=?

> +		ret = qspi->irq;
> +		goto out;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, qspi->irq, mchp_coreqspi_isr,
> +			       IRQF_SHARED, pdev->name, qspi);
> +	if (ret) {
> +		dev_err(&pdev->dev, "request_irq failed %d\n", ret);
> +		goto out;
> +	}
> +
> +	ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
> +	ctlr->mem_ops = &mchp_coreqspi_mem_ops;
> +	ctlr->setup = mchp_coreqspi_setup_op;
> +	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
> +			  SPI_TX_DUAL | SPI_TX_QUAD;
> +	ctlr->dev.of_node = np;
> +
> +	ret = devm_spi_register_controller(&pdev->dev, ctlr);
> +	if (ret) {
> +		dev_err_probe(&pdev->dev, ret,
> +			      "spi_register_controller failed\n");
> +		goto out;
> +	}
> +
> +	return 0;
> +
> +out:
> +	clk_disable_unprepare(qspi->clk);
> +
> +	return ret;
> +}
> +
> +static int mchp_coreqspi_remove(struct platform_device *pdev)
> +{
> +	struct mchp_coreqspi *qspi = platform_get_drvdata(pdev);
> +	u32 control = readl_relaxed(qspi->regs + REG_CONTROL);
> +
> +	mchp_coreqspi_disable_ints(qspi);
> +	control &= ~CONTROL_ENABLE;
> +	writel_relaxed(control, qspi->regs + REG_CONTROL);
> +	clk_disable_unprepare(qspi->clk);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id mchp_coreqspi_of_match[] = {
> +	{ .compatible = "microchip,mpfs-qspi" },
> +	{ .compatible = "microchip,coreqspi-rtl-v2" },

This is not what the binding is saying.


Best regards,
Krzysztof