linux-kernel - Re: [PATCH v3 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC

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Date:   Tue, 28 Apr 2020 08:27:59 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        devicetree@...r.kernel.org, cheol.yong.kim@...el.com,
        hauke.mehrtens@...el.com, qi-ming.wu@...el.com,
        anders.roxell@...aro.org, vigneshr@...com, arnd@...db.de,
        richard@....at, brendanhiggins@...gle.com,
        linux-mips@...r.kernel.org, robh+dt@...nel.org, tglx@...utronix.de,
        masonccyang@...c.com.tw, andriy.shevchenko@...el.com
Subject: Re: [PATCH v3 2/2] mtd: rawnand: Add NAND controller support on
 Intel LGM SoC

On Tue, 28 Apr 2020 14:17:30 +0800
"Ramuthevar, Vadivel MuruganX"
<vadivel.muruganx.ramuthevar@...ux.intel.com> wrote:

> Hi Miquel,
> 
>     Thank you very much for the review comments and your time...
> 
> On 27/4/2020 11:51 pm, Miquel Raynal wrote:
> > Hi Ramuthevar,
> >   
> >>> +static int ebu_nand_probe(struct platform_device *pdev)
> >>> +{
> >>> +	struct device *dev = &pdev->dev;
> >>> +	struct ebu_nand_controller *ebu_host;
> >>> +	struct nand_chip *nand;
> >>> +	phys_addr_t nandaddr_pa;
> >>> +	struct mtd_info *mtd;
> >>> +	struct resource *res;
> >>> +	int ret;
> >>> +	u32 cs;
> >>> +
> >>> +	ebu_host = devm_kzalloc(dev, sizeof(*ebu_host), GFP_KERNEL);
> >>> +	if (!ebu_host)
> >>> +		return -ENOMEM;
> >>> +
> >>> +	ebu_host->dev = dev;
> >>> +	nand_controller_init(&ebu_host->controller);
> >>> +
> >>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ebunand");
> >>> +	ebu_host->ebu_addr = devm_ioremap_resource(&pdev->dev, res);
> >>> +	if (IS_ERR(ebu_host->ebu_addr))
> >>> +		return PTR_ERR(ebu_host->ebu_addr);
> >>> +
> >>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsnand");
> >>> +	ebu_host->nand_addr = devm_ioremap_resource(&pdev->dev, res);
> >>> +	if (IS_ERR(ebu_host->nand_addr))
> >>> +		return PTR_ERR(ebu_host->nand_addr);
> >>> +
> >>> +	ret = device_property_read_u32(dev, "nand,cs", &cs);  
> >>
> >> CS ids should be encoded in the reg property (see [1]).  
> > 
> > Is it your choice to only support a single CS or is it actually a
> > controller limitation?  
> 
> Yes , its controller limitation to support only one CS

I'm pretty sure that's not true, otherwise you wouldn't have to select
the CS you want to use :P.