linux-kernel - Re: [PATCH v11 2/2] mtd: rawnand: Add Loongson-1 NAND Controller Driver

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Message-ID: <8734hdsl1i.fsf@bootlin.com>
Date: Mon, 20 Jan 2025 13:54:17 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Keguang Zhang <keguang.zhang@...il.com>
Cc: Keguang Zhang via B4 Relay <devnull+keguang.zhang.gmail.com@...nel.org>,
  Richard Weinberger <richard@....at>,  Vignesh Raghavendra
 <vigneshr@...com>,  Rob Herring <robh@...nel.org>,  Krzysztof Kozlowski
 <krzk+dt@...nel.org>,  Conor Dooley <conor+dt@...nel.org>,
  linux-mtd@...ts.infradead.org,  linux-kernel@...r.kernel.org,
  devicetree@...r.kernel.org,  linux-media@...r.kernel.org
Subject: Re: [PATCH v11 2/2] mtd: rawnand: Add Loongson-1 NAND Controller
 Driver


>> IIUC, yes and no. It is the remapped address of the physical address you
>> want to reach, not the physical address itself. The type is dma_addr_t
>> and not phys_addr_t and you can get a dma address out of a physical
>> address with a call to dma_map_resource(). The numerical value might be
>> the same if there is no IO-MMU involved, but the good practice is to
>> remap anyway.
>
> Got it. I will keep dma_map_resource() as it is, which is called in
> ls1x_nand_probe().
>
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-dma");
> +       host->dma_base = dma_map_resource(dev, res->start, resource_size(res),
> +                                         DMA_BIDIRECTIONAL, 0);
> +       if (dma_mapping_error(dev, host->dma_base))
> +               return -ENXIO;

Looks correct.