linux-kernel - Re: [PATCH v7 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC

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Date:   Fri, 15 May 2020 14:48:31 +0300
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     "Ramuthevar,Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        devicetree@...r.kernel.org, miquel.raynal@...tlin.com,
        richard@....at, vigneshr@...com, arnd@...db.de,
        brendanhiggins@...gle.com, tglx@...utronix.de,
        boris.brezillon@...labora.com, anders.roxell@...aro.org,
        masonccyang@...c.com.tw, robh+dt@...nel.org,
        linux-mips@...r.kernel.org, hauke.mehrtens@...el.com,
        qi-ming.wu@...el.com, cheol.yong.kim@...el.com
Subject: Re: [PATCH v7 2/2] mtd: rawnand: Add NAND controller support on
 Intel LGM SoC

On Fri, May 15, 2020 at 06:55:37PM +0800, Ramuthevar,Vadivel MuruganX wrote:
> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
> 
> This patch adds the new IP of Nand Flash Controller(NFC) support
> on Intel's Lightning Mountain(LGM) SoC.
> 
> DMA is used for burst data transfer operation, also DMA HW supports
> aligned 32bit memory address and aligned data access by default.
> DMA burst of 8 supported. Data register used to support the read/write
> operation from/to device.
> 
> NAND controller driver implements ->exec_op() to replace legacy hooks,
> these specific call-back method to execute NAND operations.

...

> +	ebu_host->dma_tx = dma_request_chan(dev, "tx");
> +	if (IS_ERR(ebu_host->dma_tx)) {
> +		ret = PTR_ERR(ebu_host->dma_tx);
> +		dev_err(dev, "DMA tx channel request fail!.\n");
> +		goto err_cleanup_dma;
> +	}
> +
> +	ebu_host->dma_rx = dma_request_chan(dev, "rx");
> +	if (IS_ERR(ebu_host->dma_rx)) {
> +		ret = PTR_ERR(ebu_host->dma_rx);

> +		dev_err(dev, "DMA tx channel request fail!.\n");

rx ?

> +		goto err_cleanup_dma;
> +	}

...

> +static int ebu_nand_remove(struct platform_device *pdev)
> +{
> +	struct ebu_nand_controller *ebu_host = platform_get_drvdata(pdev);
> +

> +	if (ebu_host) {

I dunno why you need this check? Maybe I forgot your answer to my comment?

> +		mtd_device_unregister(nand_to_mtd(&ebu_host->chip));
> +		nand_cleanup(&ebu_host->chip);
> +		ebu_nand_disable(&ebu_host->chip);
> +		ebu_dma_cleanup(ebu_host);
> +		clk_disable_unprepare(ebu_host->clk);
> +	}
> +
> +	return 0;
> +}

-- 
With Best Regards,
Andy Shevchenko