linux-kernel - Re: [PATCH v2 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC

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Message-ID: <20200420102959.2659774d@collabora.com>
Date:   Mon, 20 Apr 2020 10:29:59 +0200
From:   Boris Brezillon <boris.brezillon@...labora.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,
        anders.roxell@...aro.org, masonccyang@...c.com.tw,
        piotrs@...ence.com, robh+dt@...nel.org, linux-mips@...r.kernel.org,
        hauke.mehrtens@...el.com, andriy.shevchenko@...el.com,
        qi-ming.wu@...el.com, cheol.yong.kim@...el.com
Subject: Re: [PATCH v2 2/2] mtd: rawnand: Add NAND controller support on
 Intel LGM SoC

On Fri, 17 Apr 2020 16:21:47 +0800
"Ramuthevar,Vadivel MuruganX"
<vadivel.muruganx.ramuthevar@...ux.intel.com> wrote:

> +
> +	res = devm_platform_ioremap_resource_byname(pdev, lgm_host->cs_name);
> +	lgm_host->nandaddr_va = res;
> +	nandaddr_pa = res->start;
> +	if (IS_ERR(lgm_host->nandaddr_va))
> +		return PTR_ERR(lgm_host->nandaddr_va);

Hm, I didn't realize you needed the physical address for DMA transfers.
Just use platform_get_resource_by_name()+devm_ioremap_resource() in
that case.


> +
> +	writel(LGM_BUSCON_CMULT_V4 | LGM_BUSCON_RECOVC(1) |
> +	       LGM_BUSCON_HOLDC(1) | LGM_BUSCON_WAITRDC(2) |
> +	       LGM_BUSCON_WAITWRC(2) | LGM_BUSCON_BCGEN_CS | LGM_BUSCON_ALEC |
> +	       LGM_BUSCON_SETUP_EN, lgm_host->lgm_va + LGM_BUSCON(cs));

I'm sure some the timings you hardcode here can be extracted from the
NAND timings. Can you see if you can implement ->setup_data_interface()
instead.