linux-kernel - Re: [PATCH 1/2] mtd: rawnand: add driver support for MT7621 nand flash controller

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Date:   Tue, 31 Mar 2020 20:47:16 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Weijie Gao <weijie.gao@...iatek.com>
Cc:     <linux-mtd@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mips@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Piotr Sroka <piotrs@...ence.com>,
        Mason Yang <masonccyang@...c.com.tw>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 1/2] mtd: rawnand: add driver support for MT7621 nand
 flash controller

On Wed, 1 Apr 2020 02:07:58 +0800
Weijie Gao <weijie.gao@...iatek.com> wrote:

> This patch adds NAND flash controller driver for MediaTek MT7621 SoC.
> 
> The NAND flash controller is similar with controllers described in
> mtk_nand.c, except that the controller from MT7621 doesn't support DMA
> transmission, and some registers' offset and fields are different.
> 

Please don't duplicate driver the driver for those minor differences:
use regmap/reg_field to abstract reg field positions and make the DMA
optional.