From: David Woodhouse <dwmw2@infradead.org>
To: Mark Brown <broonie@kernel.org>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"computersforpeace@gmail.com" <computersforpeace@gmail.com>,
"b44548@freescale.com" <b44548@freescale.com>,
"thomas.langer@lantiq.com" <thomas.langer@lantiq.com>,
"b18965@freescale.com" <b18965@freescale.com>,
"dedekind1@gmail.com" <dedekind1@gmail.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>,
Huang Shijie <b32955@freescale.com>,
"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
"Gupta, Pekon" <pekon@ti.com>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
"lznuaa@gmail.com" <lznuaa@gmail.com>,
"shawn.guo@linaro.org" <shawn.guo@linaro.org>,
Huang Shijie <shijie8@gmail.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 0/8] Add the Quadspi driver for vf610-twr
Date: Thu, 12 Sep 2013 13:02:03 +0100 [thread overview]
Message-ID: <1378987323.2627.429.camel@shinybook.infradead.org> (raw)
In-Reply-To: <20130912114831.GL29403@sirena.org.uk>
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On Thu, 2013-09-12 at 12:48 +0100, Mark Brown wrote:
> On Thu, Sep 12, 2013 at 12:17:45PM +0100, David Woodhouse wrote:
>
> > Right. The issue here is that the LUT is currently *pre-populated*, with
> > an incestuously-"known" set of commands that the slave is expected to
> > support.
>
> So, to repeat my earlier question can someone tell me what a LUT is?
I only know what's in the patch that you have also received, but it
seems to be a table of commands. To send a given command to the flash,
you write the actual command to the some slot in the LUT, then 'trigger'
it by writing its index to another register.
I think this whole thing is about the fact that they are *prepopulating*
the LUT with a set of 'known' commands, and have incestuous knowledge
about what commands will be used, rather than being a truly generic SPI
driver and being able to cope with *any* commands that might be sent to
the slave(s), dynamically setting up to the LUT as required.
--
dwmw2
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next prev parent reply other threads:[~2013-09-12 12:02 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-30 2:07 [PATCH v3 0/8] Add the Quadspi driver for vf610-twr Huang Shijie
2013-08-30 2:07 ` [PATCH v3 1/8] mtd: m25p80: move the spi-nor commands to a header Huang Shijie
2013-08-30 2:07 ` [PATCH v3 2/8] mtd: m25p80: add support for Spansion s25fl128s chip Huang Shijie
2013-08-30 2:07 ` [PATCH v3 3/8] mtd: m25p80: add the quad-read support Huang Shijie
2013-08-30 2:07 ` [PATCH v3 4/8] mtd: m25p80: add the DDR " Huang Shijie
2013-08-30 2:07 ` [PATCH v3 5/8] spi: Add Freescale QuadSpi driver Huang Shijie
2013-09-10 18:09 ` Mark Brown
2013-09-11 2:40 ` Huang Shijie
2013-09-11 10:39 ` Mark Brown
2013-08-30 2:07 ` [PATCH v3 6/8] Documentation: add the binding file for Quadspi driver Huang Shijie
2013-08-30 2:07 ` [PATCH v3 7/8] ARM: dts: vf610: change the PAD values for Quadspi Huang Shijie
2013-08-30 2:07 ` [PATCH v3 8/8] ARM: dts: vf610-twr: Add SPI NOR support Huang Shijie
2013-09-04 2:16 ` [PATCH v3 0/8] Add the Quadspi driver for vf610-twr Huang Shijie
2013-09-04 9:55 ` Mark Brown
2013-09-04 10:29 ` Huang Shijie
2013-09-04 11:33 ` Mark Brown
2013-09-05 1:43 ` Huang Shijie
2013-09-04 13:45 ` thomas.langer
2013-09-05 2:04 ` Huang Shijie
2013-09-05 4:25 ` Gupta, Pekon
2013-09-05 5:34 ` Huang Shijie
2013-09-05 6:32 ` Gupta, Pekon
2013-09-05 7:45 ` Huang Shijie
2013-09-05 9:11 ` Gupta, Pekon
2013-09-05 9:30 ` Huang Shijie
2013-09-05 13:50 ` Mark Brown
2013-09-06 2:36 ` Huang Shijie
2013-09-08 13:47 ` Mark Brown
2013-09-09 3:07 ` Huang Shijie
2013-09-09 15:14 ` Mark Brown
2013-09-10 6:59 ` Huang Shijie
2013-09-10 18:07 ` Mark Brown
2013-09-11 2:38 ` Huang Shijie
2013-09-11 10:41 ` Mark Brown
2013-09-11 10:54 ` Huang Shijie
2013-09-11 11:30 ` Mark Brown
2013-09-11 12:26 ` Gupta, Pekon
2013-09-11 12:35 ` Mark Brown
2013-09-12 9:18 ` Huang Shijie
2013-09-12 10:20 ` Mark Brown
2013-09-13 3:30 ` Huang Shijie
2013-09-12 15:32 ` David Woodhouse
2013-09-12 10:39 ` David Woodhouse
2013-09-12 10:56 ` Gupta, Pekon
2013-09-12 11:17 ` David Woodhouse
2013-09-12 11:48 ` Mark Brown
2013-09-12 11:55 ` Russell King - ARM Linux
2013-09-12 13:24 ` Mark Brown
2013-09-12 13:25 ` Ricard Wanderlof
2013-09-12 14:10 ` Russell King - ARM Linux
2013-09-12 12:02 ` David Woodhouse [this message]
2013-09-12 13:43 ` Mark Brown
2013-09-12 14:03 ` David Woodhouse
2013-09-12 14:40 ` Mark Brown
2013-09-13 3:14 ` Huang Shijie
2013-09-11 14:05 ` David Woodhouse
2013-09-11 15:07 ` Mark Brown
[not found] ` <20130909151450 <52318953.6090405@freescale.com>
[not found] ` <52318953.6090405@freescale.com>
2013-09-12 9:50 ` David Woodhouse
2013-09-12 10:19 ` Mark Brown
2013-09-13 2:58 ` Huang Shijie
2013-09-12 15:22 ` David Woodhouse
2013-09-13 4:12 ` Huang Shijie
2013-09-12 16:26 ` David Woodhouse
2013-09-13 3:06 ` Huang Shijie
2013-09-12 16:27 ` Fabio Estevam
[not found] ` <CAOMZO5C54wCdEOHJmwVLk_zkh-twjis1ys20Gd1+T+ygM+A6bg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-09-13 2:21 ` Huang Shijie
2013-09-12 20:56 ` Mark Brown
[not found] ` <20130912205644.GW29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-13 4:55 ` Huang Shijie
[not found] ` <52329AD3.2050608-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2013-09-13 10:21 ` Mark Brown
[not found] ` <20130913102127.GD29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-16 2:40 ` Huang Shijie
2013-09-16 10:19 ` Mark Brown
[not found] ` <20130916101912.GY29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-16 10:27 ` Huang Shijie
[not found] ` <5236DD17.5090203-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2013-09-16 11:06 ` Mark Brown
[not found] ` <20130916110634.GC29403-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-17 2:14 ` Huang Shijie
[not found] ` <5237BB01.3080700-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2013-09-17 10:51 ` Mark Brown
[not found] ` <20130917105142.GO21013-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-17 15:05 ` Gerhard Sittig
2013-09-17 16:49 ` Gerhard Sittig
2013-09-17 19:54 ` Sourav Poddar
[not found] ` <20130917150548.GE14747-kDjWylLy9wD0K7fsECOQyeGNnDKD8DIp@public.gmane.org>
2013-09-17 19:13 ` Mark Brown
[not found] ` <20130917191318.GJ21013-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2013-09-18 15:40 ` David Woodhouse
[not found] ` <1379518822.753.91.camel-Fexsq3y4057IgHVZqg5X0TlWvGAXklZc@public.gmane.org>
2013-09-18 16:00 ` Mark Brown
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