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Date:   Wed, 25 Mar 2020 06:27:56 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Tiezhu Yang <yangtiezhu@loongson.cn>
Cc:     Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Huacai Chen <chenhc@lemote.com>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
        Xuefeng Li <lixuefeng@loongson.cn>
Subject: Re: [PATCH v2 2/3] MIPS: Loongson: Add DMA support for 7A1000
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On Mon, Mar 23, 2020 at 10:59:14AM +0800, Tiezhu Yang wrote:
> Implement __phys_to_dma() and __dma_to_phys() according to the
> node id offset in the 7A1000 DMA route config register.

Can you please try to just use the dma_pfn_offset field in struct device
for all loongson platforms?  I'm pretty sure I asked for that last time
around..