linux-kernel - Re: [PATCH v5] MIPS: Loongson: Add DMA support for LS7A

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Date:   Wed, 29 Apr 2020 17:25:42 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     chenhc@...ote.com
Cc:     hch@...radead.org, jiaxun.yang@...goat.com,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        lixuefeng@...ngson.cn, tsbogend@...ha.franken.de,
        yangtiezhu@...ngson.cn
Subject: Re: [PATCH v5] MIPS: Loongson: Add DMA support for LS7A

Sorry, I can not receive email today due to some unknown reason,
so I use the "mailto: link" in the Linux-MIPS Archive to reply.

 > Please use alpha-betical order here, which means put ls7a things
 > before rs780 things.

OK, thanks. I will modify it and send v6.

 > Why use a hardcoded 37? LS7A's node-id bits are configurable in BIOS.

Oh, the platform dependent implementation of __phys_to_dma()
and __dma_to_phys() are deleted, and ls7a_dma_config() is an
empty function, the hardware can translate address of node id
automatically for LS7A.