linux-kernel - Re: [PATCH v2 1/3] mtd: rawnand: cadence: support deferred prob when DMA is not ready

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Message-ID: <87o6zi83se.fsf@bootlin.com>
Date: Tue, 04 Feb 2025 10:20:17 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: "Rabara, Niravkumar L" <niravkumar.l.rabara@...el.com>
Cc: Richard Weinberger <richard@....at>,  Vignesh Raghavendra
 <vigneshr@...com>,  "linux@...blig.org" <linux@...blig.org>,  Shen Lichuan
 <shenlichuan@...o.com>,  Jinjie Ruan <ruanjinjie@...wei.com>,
  "u.kleine-koenig@...libre.com" <u.kleine-koenig@...libre.com>,
  "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
  "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
  "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] mtd: rawnand: cadence: support deferred prob
 when DMA is not ready

Hello,

> My apologies for the confusion.
> Slave DMA terminology used in cadence nand controller bindings and
> driver is indeed confusing.  
>
> To answer your question it is, 
> 1 - External DMA (Generic DMA controller).
>
> Nand controller IP do not have embedded DMA controller (2 - peripheral DMA). 
>
> FYR, how external DMA is used. 
> https://elixir.bootlin.com/linux/v6.13.1/source/drivers/mtd/nand/raw/cadence-nand-controller.c#L1962

In this case we should have a dmas property (and perhaps dma-names), no?

Miquèl