linux-kernel - Re: [PATCH] mtd: rawnand: driver for Mediatek MT7621 SoC NAND flash controller

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Message-ID: <20191107092053.Horde.i3MVcW9RqZDOQBMADZX9fuc@www.vdorst.com>
Date:   Thu, 07 Nov 2019 09:20:53 +0000
From:   René van Dorst <opensource@...rst.com>
To:     gerg@...nel.org
Cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, neil@...wn.name, blogic@...nwrt.org,
        DENG Qingfang <dengqf6@...l2.sysu.edu.cn>,
        Chuanhong Guo <gch981213@...il.com>,
        Weijie Gao <hackpascal@...il.com>
Subject: Re: [PATCH] mtd: rawnand: driver for Mediatek MT7621 SoC NAND flash
 controller

Quoting gerg@...nel.org:

> From: Greg Ungerer <gerg@...nel.org>
>
> Add a driver to support the NAND flash controller of the MediaTek MT7621
> System-on-Chip device. (This one is the MIPS based parts from Mediatek).
>
> This code is a re-working of the earlier patches for this hardware that
> have been floating around the internet for years:
>
> https://github.com/ReclaimYourPrivacy/cloak/blob/master/target/linux/ramips/patches-3.18/0045-mtd-add-mt7621-nand-support.patch
>
> This is a much cleaned up version, put in staging to start with.
> It does still have some problems, mainly that it still uses a lot of the
> mtd raw nand legacy support.
>
> The driver not only compiles, but it works well on the small range of
> hardware platforms that it has been used on so far. I have been using
> for quite a while now, cleaning up as I get time.
>
> So... I am looking for comments on the best approach forward with this.
> At least in staging it can get some more eyeballs going over it.
>
> There is a mediatek nand driver already, mtk_nand.c, for their ARM based
> System-on-Chip devices. That hardware module looks to have some hardware
> similarities with this one. At this point I don't know if that can be
> used on the 7621 based devices. (I tried a quick and dirty setup and had
> no success using it on the 7621).
>
> Thoughts?

+CC DENG Qingfang, Chuanhong Guo, Weijie Gao to the list.

Hi Greg,

Thanks for posting this driver.

But I would like to mention that the openwrt community is currently  
working on a
new version which is based a newer version of the MediaTek vendor driver.
That version is currently targeted for the openwrt 4.19 kernel.
See full pull request [1] and NAND driver patch [2]

It would be a shame if duplicate work has been done.

Greats,

René

[1]: https://github.com/openwrt/openwrt/pull/2385
[2]:  
https://github.com/openwrt/openwrt/pull/2385/commits/b2569c0a5943fe8f94ba07c9540ecd14006d729a

<snip>