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From: Boris Brezillon <boris.brezillon@collabora.com>
To: Joel Stanley <joel@jms.id.au>
Cc: "Mark Rutland" <mark.rutland@arm.com>,
	"Vignesh Raghavendra" <vigneshr@ti.com>,
	linux-aspeed <linux-aspeed@lists.ozlabs.org>,
	"Tudor Ambarus" <tudor.ambarus@microchip.com>,
	"Andrew Jeffery" <andrew@aj.id.au>,
	"Richard Weinberger" <richard@nod.at>,
	"Marek Vasut" <marek.vasut@gmail.com>,
	linux-mtd@lists.infradead.org, "Cédric Le Goater" <clg@kaod.org>,
	"Miquel Raynal" <miquel.raynal@bootlin.com>,
	"Brian Norris" <computersforpeace@gmail.com>,
	"David Woodhouse" <dwmw2@infradead.org>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 00/16] mtd: spi-nor: aspeed: AST2600 support and extensions
Date: Fri, 11 Oct 2019 08:45:22 +0200
Message-ID: <20191011084503.5b7a7c2c@dhcp-172-31-174-146.wireless.concordia.ca> (raw)
In-Reply-To: <CACPK8Xe__AYvrh40vqjwoM=XKJfp5MeqrMARpFUDGWCyJK6jXQ@mail.gmail.com>

On Thu, 10 Oct 2019 23:47:45 +0000
Joel Stanley <joel@jms.id.au> wrote:

> On Wed, 9 Oct 2019 at 20:56, Boris Brezillon
> <boris.brezillon@collabora.com> wrote:
> >
> > Hi Cedric,
> >
> > On Fri,  4 Oct 2019 13:59:03 +0200
> > Cédric Le Goater <clg@kaod.org> wrote:
> >  
> > > Hello,
> > >
> > > This series first extends the support for the Aspeed AST2500 and
> > > AST2400 SMC driver. It adds Dual Data support and read training giving
> > > the best read settings for a given chip. Support for the new AST2600
> > > SoC is added at the end.
> > >
> > > I understand that a new spi_mem framework exists and I do have an
> > > experimental driver using it. But unfortunately, it is difficult to
> > > integrate the read training. The Aspeed constraints are not compatible
> > > and i haven't had the time to extend the current framework.  
> >
> > Hm, I don't think that's a good reason to push new features to the
> > existing driver, especially since I asked others to migrate their
> > drivers to spi-mem in the past. I do understand your concerns, and I'll
> > let the SPI NOR/MTD maintainers make the final call, but I think it'd
> > be better for the SPI MEM ecosystem to think about this link-training
> > API (Vignesh needs it for the Cadence driver IIRC) rather than pushing
> > this kind of feature to spi-nor controller drivers.  
> 
> As Cedric mentioned, the OpenBMC project has been shipping the read
> training code for the ast2400/ast2400 for several years now. It would
> be great to see it in mainline.
> 
> I think it's reasonable to ask for the driver to be moved to the
> spi-mem subsystem once it has the required APIs.

Except it won't have the necessary APIs unless someone works on it, and
adding this feature to existing spi-nor drivers won't help achieving
this goal.

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Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-04 11:59 Cédric Le Goater
2019-10-04 11:59 ` [PATCH 01/16] mtd: spi-nor: aspeed: Use command mode for reads Cédric Le Goater
2019-10-04 11:59 ` [PATCH 02/16] mtd: spi-nor: aspeed: Add support for SPI dual IO read mode Cédric Le Goater
2019-10-04 11:59 ` [PATCH 03/16] mtd: spi-nor: aspeed: Link controller with the ahb clock Cédric Le Goater
2019-10-04 11:59 ` [PATCH 04/16] mtd: spi-nor: aspeed: Add read training Cédric Le Goater
2019-10-11 12:28   ` Boris Brezillon
2019-10-11 13:13     ` Vignesh Raghavendra
2019-10-11 14:03       ` Cédric Le Goater
2019-10-11 13:55     ` Cédric Le Goater
2019-10-11 14:29       ` Boris Brezillon
2019-10-11 14:37         ` Cédric Le Goater
2019-10-04 11:59 ` [PATCH 05/16] mtd: spi-nor: aspeed: Limit the maximum SPI frequency Cédric Le Goater
2019-10-04 11:59 ` [PATCH 06/16] mtd: spi-nor: fix options for mx66l51235f Cédric Le Goater
2019-10-04 16:23   ` Cédric Le Goater
2019-10-04 11:59 ` [PATCH 07/16] mtd: spi-nor: aspeed: Add support for the 4B opcodes Cédric Le Goater
2019-10-04 11:59 ` [PATCH 08/16] mtd: spi-nor: Add support for w25q512jv Cédric Le Goater
2019-10-04 11:59 ` [PATCH 09/16] mtd: spi-nor: aspeed: Introduce a field for the AHB physical address Cédric Le Goater
2019-10-04 11:59 ` [PATCH 10/16] mtd: spi-nor: aspeed: Introduce segment operations Cédric Le Goater
2019-10-04 11:59 ` [PATCH 11/16] dt-bindings: mtd: aspeed-smc: Add new comptatible for AST2600 Cédric Le Goater
2019-10-15 19:26   ` Rob Herring
2019-10-04 11:59 ` [PATCH 12/16] mtd: spi-nor: aspeed: Add initial support for the AST2600 Cédric Le Goater
2019-10-04 11:59 ` [PATCH 13/16] mtd: spi-nor: aspeed: Check for disabled segments on " Cédric Le Goater
2019-10-04 12:09 ` [PATCH 14/16] mtd: spi-nor: aspeed: Introduce training operations per platform Cédric Le Goater
2019-10-04 12:09   ` [PATCH 15/16] mtd: spi-nor: aspeed: Introduce a HCLK mask for training Cédric Le Goater
2019-10-04 12:09   ` [PATCH 16/16] mtd: spi-nor: aspeed: Add read training support for the AST2600 Cédric Le Goater
2019-10-09 20:55 ` [PATCH 00/16] mtd: spi-nor: aspeed: AST2600 support and extensions Boris Brezillon
2019-10-10 23:47   ` Joel Stanley
2019-10-11  6:45     ` Boris Brezillon [this message]
2019-10-11  9:29       ` Cédric Le Goater
2019-10-11  9:51         ` Boris Brezillon
2019-10-11 11:47           ` Cédric Le Goater
2019-10-11 12:07             ` Boris Brezillon
2019-10-11 13:07               ` Cédric Le Goater
2019-10-11 14:01                 ` Boris Brezillon

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