From: Mark Brown <broonie@kernel.org>
To: David Woodhouse <dwmw2@infradead.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: Wed, 11 Sep 2013 16:07:05 +0100 [thread overview]
Message-ID: <20130911150705.GT29403@sirena.org.uk> (raw)
In-Reply-To: <1378908315.2627.392.camel@shinybook.infradead.org>
[-- Attachment #1: Type: text/plain, Size: 793 bytes --]
On Wed, Sep 11, 2013 at 03:05:15PM +0100, David Woodhouse wrote:
> Why can't the flash driver *provide* the required information?
Yeah, that's my question too...
> So far I seem to have got it into my head that we have a SPI controller
> which is connected to more than one device, and we can't send commands
> to one without sending to the other... and that means that we have to
> send a *NOP* to the "unwanted" device. Is that right?
That shouldn't be the case, SPI has a chip select line which is asserted
to talk to a particular chip, while it's not asserted the slaves should
ignore any activity on the bus. If activity on one slave affects
another something is broken, this is the first time I noticed that being
an issue but I might've missed some of the MTD side of this thread.
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WARNING: multiple messages have this Message-ID (diff)
From: broonie@kernel.org (Mark Brown)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 0/8] Add the Quadspi driver for vf610-twr
Date: Wed, 11 Sep 2013 16:07:05 +0100 [thread overview]
Message-ID: <20130911150705.GT29403@sirena.org.uk> (raw)
In-Reply-To: <1378908315.2627.392.camel@shinybook.infradead.org>
On Wed, Sep 11, 2013 at 03:05:15PM +0100, David Woodhouse wrote:
> Why can't the flash driver *provide* the required information?
Yeah, that's my question too...
> So far I seem to have got it into my head that we have a SPI controller
> which is connected to more than one device, and we can't send commands
> to one without sending to the other... and that means that we have to
> send a *NOP* to the "unwanted" device. Is that right?
That shouldn't be the case, SPI has a chip select line which is asserted
to talk to a particular chip, while it's not asserted the slaves should
ignore any activity on the bus. If activity on one slave affects
another something is broken, this is the first time I noticed that being
an issue but I might've missed some of the MTD side of this thread.
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WARNING: multiple messages have this Message-ID (diff)
From: Mark Brown <broonie@kernel.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Huang Shijie <b32955@freescale.com>,
Huang Shijie <shijie8@gmail.com>, "Gupta, Pekon" <pekon@ti.com>,
"thomas.langer@lantiq.com" <thomas.langer@lantiq.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"shawn.guo@linaro.org" <shawn.guo@linaro.org>,
"b44548@freescale.com" <b44548@freescale.com>,
"dedekind1@gmail.com" <dedekind1@gmail.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"b18965@freescale.com" <b18965@freescale.com>,
"linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>,
"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
"lznuaa@gmail.com" <lznuaa@gmail.com>,
"computersforpeace@gmail.com" <computersforpeace@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: Wed, 11 Sep 2013 16:07:05 +0100 [thread overview]
Message-ID: <20130911150705.GT29403@sirena.org.uk> (raw)
In-Reply-To: <1378908315.2627.392.camel@shinybook.infradead.org>
[-- Attachment #1: Type: text/plain, Size: 793 bytes --]
On Wed, Sep 11, 2013 at 03:05:15PM +0100, David Woodhouse wrote:
> Why can't the flash driver *provide* the required information?
Yeah, that's my question too...
> So far I seem to have got it into my head that we have a SPI controller
> which is connected to more than one device, and we can't send commands
> to one without sending to the other... and that means that we have to
> send a *NOP* to the "unwanted" device. Is that right?
That shouldn't be the case, SPI has a chip select line which is asserted
to talk to a particular chip, while it's not asserted the slaves should
ignore any activity on the bus. If activity on one slave affects
another something is broken, this is the first time I noticed that being
an issue but I might've missed some of the MTD side of this thread.
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next prev parent reply other threads:[~2013-09-11 15:07 UTC|newest]
Thread overview: 241+ 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 ` Huang Shijie
2013-08-30 2:07 ` 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 ` Huang Shijie
2013-08-30 2:07 ` 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 ` Huang Shijie
2013-08-30 2:07 ` 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 ` Huang Shijie
2013-08-30 2:07 ` Huang Shijie
2013-08-30 2:07 ` [PATCH v3 4/8] mtd: m25p80: add the DDR " Huang Shijie
2013-08-30 2:07 ` Huang Shijie
2013-08-30 2:07 ` Huang Shijie
2013-08-30 2:07 ` [PATCH v3 5/8] spi: Add Freescale QuadSpi driver Huang Shijie
2013-08-30 2:07 ` Huang Shijie
2013-08-30 2:07 ` Huang Shijie
2013-09-10 18:09 ` Mark Brown
2013-09-10 18:09 ` Mark Brown
2013-09-10 18:09 ` Mark Brown
2013-09-11 2:40 ` Huang Shijie
2013-09-11 2:40 ` Huang Shijie
2013-09-11 2:40 ` Huang Shijie
2013-09-11 10:39 ` Mark Brown
2013-09-11 10:39 ` Mark Brown
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 ` Huang Shijie
2013-08-30 2:07 ` 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 ` Huang Shijie
2013-08-30 2:07 ` Huang Shijie
2013-08-30 2:07 ` [PATCH v3 8/8] ARM: dts: vf610-twr: Add SPI NOR support Huang Shijie
2013-08-30 2:07 ` Huang Shijie
2013-08-30 2:07 ` Huang Shijie
2013-09-04 2:16 ` [PATCH v3 0/8] Add the Quadspi driver for vf610-twr Huang Shijie
2013-09-04 2:16 ` Huang Shijie
2013-09-04 2:16 ` Huang Shijie
2013-09-04 9:55 ` Mark Brown
2013-09-04 9:55 ` Mark Brown
2013-09-04 9:55 ` Mark Brown
2013-09-04 10:29 ` Huang Shijie
2013-09-04 10:29 ` Huang Shijie
2013-09-04 10:29 ` Huang Shijie
2013-09-04 11:33 ` Mark Brown
2013-09-04 11:33 ` Mark Brown
2013-09-04 11:33 ` Mark Brown
2013-09-05 1:43 ` Huang Shijie
2013-09-05 1:43 ` Huang Shijie
2013-09-05 1:43 ` Huang Shijie
2013-09-04 13:45 ` thomas.langer
2013-09-04 13:45 ` thomas.langer
2013-09-04 13:45 ` thomas.langer at lantiq.com
2013-09-05 2:04 ` Huang Shijie
2013-09-05 2:04 ` Huang Shijie
2013-09-05 2:04 ` Huang Shijie
2013-09-05 4:25 ` Gupta, Pekon
2013-09-05 4:25 ` Gupta, Pekon
2013-09-05 4:25 ` Gupta, Pekon
2013-09-05 5:34 ` Huang Shijie
2013-09-05 5:34 ` Huang Shijie
2013-09-05 5:34 ` Huang Shijie
2013-09-05 6:32 ` Gupta, Pekon
2013-09-05 6:32 ` Gupta, Pekon
2013-09-05 6:32 ` Gupta, Pekon
2013-09-05 7:45 ` Huang Shijie
2013-09-05 7:45 ` Huang Shijie
2013-09-05 7:45 ` Huang Shijie
2013-09-05 9:11 ` Gupta, Pekon
2013-09-05 9:11 ` Gupta, Pekon
2013-09-05 9:11 ` Gupta, Pekon
2013-09-05 9:30 ` Huang Shijie
2013-09-05 9:30 ` Huang Shijie
2013-09-05 9:30 ` Huang Shijie
2013-09-05 13:50 ` Mark Brown
2013-09-05 13:50 ` Mark Brown
2013-09-05 13:50 ` Mark Brown
2013-09-06 2:36 ` Huang Shijie
2013-09-06 2:36 ` Huang Shijie
2013-09-06 2:36 ` Huang Shijie
2013-09-08 13:47 ` Mark Brown
2013-09-08 13:47 ` Mark Brown
2013-09-08 13:47 ` Mark Brown
2013-09-09 3:07 ` Huang Shijie
2013-09-09 3:07 ` Huang Shijie
2013-09-09 3:07 ` Huang Shijie
2013-09-09 15:14 ` Mark Brown
2013-09-09 15:14 ` Mark Brown
2013-09-09 15:14 ` Mark Brown
2013-09-10 6:59 ` Huang Shijie
2013-09-10 6:59 ` Huang Shijie
2013-09-10 6:59 ` Huang Shijie
2013-09-10 18:07 ` Mark Brown
2013-09-10 18:07 ` Mark Brown
2013-09-10 18:07 ` Mark Brown
2013-09-11 2:38 ` Huang Shijie
2013-09-11 2:38 ` Huang Shijie
2013-09-11 2:38 ` Huang Shijie
2013-09-11 10:41 ` Mark Brown
2013-09-11 10:41 ` Mark Brown
2013-09-11 10:41 ` Mark Brown
2013-09-11 10:54 ` Huang Shijie
2013-09-11 10:54 ` Huang Shijie
2013-09-11 10:54 ` Huang Shijie
2013-09-11 11:30 ` Mark Brown
2013-09-11 11:30 ` Mark Brown
2013-09-11 11:30 ` Mark Brown
2013-09-11 12:26 ` Gupta, Pekon
2013-09-11 12:26 ` Gupta, Pekon
2013-09-11 12:26 ` Gupta, Pekon
2013-09-11 12:35 ` Mark Brown
2013-09-11 12:35 ` Mark Brown
2013-09-11 12:35 ` Mark Brown
2013-09-12 9:18 ` Huang Shijie
2013-09-12 9:18 ` Huang Shijie
2013-09-12 9:18 ` Huang Shijie
2013-09-12 10:20 ` Mark Brown
2013-09-12 10:20 ` Mark Brown
2013-09-12 10:20 ` Mark Brown
2013-09-13 3:30 ` Huang Shijie
2013-09-13 3:30 ` Huang Shijie
2013-09-13 3:30 ` Huang Shijie
2013-09-12 15:32 ` David Woodhouse
2013-09-12 15:32 ` David Woodhouse
2013-09-12 15:32 ` David Woodhouse
2013-09-12 10:39 ` David Woodhouse
2013-09-12 10:39 ` David Woodhouse
2013-09-12 10:39 ` David Woodhouse
2013-09-12 10:56 ` Gupta, Pekon
2013-09-12 10:56 ` Gupta, Pekon
2013-09-12 10:56 ` Gupta, Pekon
2013-09-12 11:17 ` David Woodhouse
2013-09-12 11:17 ` David Woodhouse
2013-09-12 11:17 ` David Woodhouse
2013-09-12 11:48 ` Mark Brown
2013-09-12 11:48 ` Mark Brown
2013-09-12 11:48 ` Mark Brown
2013-09-12 11:55 ` Russell King - ARM Linux
2013-09-12 11:55 ` Russell King - ARM Linux
2013-09-12 11:55 ` Russell King - ARM Linux
2013-09-12 13:24 ` Mark Brown
2013-09-12 13:24 ` Mark Brown
2013-09-12 13:24 ` Mark Brown
2013-09-12 13:25 ` Ricard Wanderlof
2013-09-12 13:25 ` Ricard Wanderlof
2013-09-12 14:10 ` Russell King - ARM Linux
2013-09-12 14:10 ` Russell King - ARM Linux
2013-09-12 14:10 ` Russell King - ARM Linux
2013-09-12 12:02 ` David Woodhouse
2013-09-12 12:02 ` David Woodhouse
2013-09-12 12:02 ` David Woodhouse
2013-09-12 13:43 ` Mark Brown
2013-09-12 13:43 ` Mark Brown
2013-09-12 13:43 ` Mark Brown
2013-09-12 14:03 ` David Woodhouse
2013-09-12 14:03 ` David Woodhouse
2013-09-12 14:03 ` David Woodhouse
2013-09-12 14:40 ` Mark Brown
2013-09-12 14:40 ` Mark Brown
2013-09-12 14:40 ` Mark Brown
2013-09-13 3:14 ` Huang Shijie
2013-09-13 3:14 ` Huang Shijie
2013-09-13 3:14 ` Huang Shijie
2013-09-11 14:05 ` David Woodhouse
2013-09-11 14:05 ` David Woodhouse
2013-09-11 14:05 ` David Woodhouse
2013-09-11 15:07 ` Mark Brown [this message]
2013-09-11 15:07 ` Mark Brown
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 9:50 ` David Woodhouse
2013-09-12 9:50 ` David Woodhouse
2013-09-12 10:19 ` Mark Brown
2013-09-12 10:19 ` Mark Brown
2013-09-12 10:19 ` Mark Brown
2013-09-13 2:58 ` Huang Shijie
2013-09-13 2:58 ` Huang Shijie
2013-09-13 2:58 ` Huang Shijie
2013-09-12 15:22 ` David Woodhouse
2013-09-12 15:22 ` David Woodhouse
2013-09-12 15:22 ` David Woodhouse
2013-09-13 4:12 ` Huang Shijie
2013-09-13 4:12 ` Huang Shijie
2013-09-13 4:12 ` Huang Shijie
2013-09-12 16:26 ` David Woodhouse
2013-09-12 16:26 ` David Woodhouse
2013-09-12 16:26 ` David Woodhouse
2013-09-13 3:06 ` Huang Shijie
2013-09-13 3:06 ` Huang Shijie
2013-09-13 3:06 ` Huang Shijie
2013-09-12 16:27 ` Fabio Estevam
2013-09-12 16:27 ` Fabio Estevam
2013-09-12 16:27 ` Fabio Estevam
2013-09-13 2:21 ` Huang Shijie
2013-09-13 2:21 ` Huang Shijie
2013-09-13 2:21 ` Huang Shijie
2013-09-12 20:56 ` Mark Brown
2013-09-12 20:56 ` Mark Brown
2013-09-12 20:56 ` Mark Brown
2013-09-13 4:55 ` Huang Shijie
2013-09-13 4:55 ` Huang Shijie
2013-09-13 4:55 ` Huang Shijie
2013-09-13 10:21 ` Mark Brown
2013-09-13 10:21 ` Mark Brown
2013-09-13 10:21 ` Mark Brown
2013-09-16 2:40 ` Huang Shijie
2013-09-16 2:40 ` Huang Shijie
2013-09-16 2:40 ` Huang Shijie
2013-09-16 10:19 ` Mark Brown
2013-09-16 10:19 ` Mark Brown
2013-09-16 10:19 ` Mark Brown
2013-09-16 10:27 ` Huang Shijie
2013-09-16 10:27 ` Huang Shijie
2013-09-16 10:27 ` Huang Shijie
2013-09-16 11:06 ` Mark Brown
2013-09-16 11:06 ` Mark Brown
2013-09-16 11:06 ` Mark Brown
2013-09-17 2:14 ` Huang Shijie
2013-09-17 2:14 ` Huang Shijie
2013-09-17 2:14 ` Huang Shijie
2013-09-17 10:51 ` Mark Brown
2013-09-17 10:51 ` Mark Brown
2013-09-17 10:51 ` Mark Brown
2013-09-17 15:05 ` Gerhard Sittig
2013-09-17 15:05 ` Gerhard Sittig
2013-09-17 15:05 ` Gerhard Sittig
2013-09-17 16:49 ` Gerhard Sittig
2013-09-17 16:49 ` Gerhard Sittig
2013-09-17 16:49 ` Gerhard Sittig
2013-09-17 19:54 ` Sourav Poddar
2013-09-17 19:54 ` Sourav Poddar
2013-09-17 19:13 ` Mark Brown
2013-09-17 19:13 ` Mark Brown
2013-09-17 19:13 ` Mark Brown
2013-09-18 15:40 ` David Woodhouse
2013-09-18 15:40 ` David Woodhouse
2013-09-18 15:40 ` David Woodhouse
2013-09-18 16:00 ` Mark Brown
2013-09-18 16:00 ` Mark Brown
2013-09-18 16:00 ` Mark Brown
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