From: Mark Brown <broonie@kernel.org>
To: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Serge Semin <fancer.lancer@gmail.com>,
Ramil Zaripov <Ramil.Zaripov@baikalelectronics.ru>,
Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Paul Burton <paulburton@kernel.org>,
Ralf Baechle <ralf@linux-mips.org>,
Lee Jones <lee.jones@linaro.org>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Arnd Bergmann <arnd@arndb.de>, Rob Herring <robh+dt@kernel.org>,
linux-mips@vger.kernel.org, devicetree@vger.kernel.org,
John Garry <john.garry@huawei.com>,
Chuanhong Guo <gch981213@gmail.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Eddie James <eajames@linux.ibm.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Chris Packham <chris.packham@alliedtelesis.co.nz>,
Tomer Maimon <tmaimon77@gmail.com>,
Masahisa Kojima <masahisa.kojima@linaro.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
Florian Fainelli <f.fainelli@gmail.com>,
Jassi Brar <jaswinder.singh@linaro.org>,
linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org
Subject: Re: [PATCH 2/2] spi: Add Baikal-T1 System Boot SPI Controller driver
Date: Tue, 19 May 2020 11:32:47 +0100 [thread overview]
Message-ID: <20200519103247.GA4611@sirena.org.uk> (raw)
In-Reply-To: <20200518211727.jrzo6tn7slqzxoyl@mobilestation>
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On Tue, May 19, 2020 at 12:17:27AM +0300, Serge Semin wrote:
> Here is what we need to do to perform the EEPROM-read operation:
> 1) Enable EEPROM-read mode.
> 2) Initialize a corresponding registers with a number of SPI transfer words
> (with bits-per-word taken into account) to read.
> 3) Push opcode + address + dummy bytes into the Tx FIFO. When it's done and
> the Tx FIFO is empty, the controller will proceed with read operations by
> pushing zeros (or ones, don't remember what level it's by default) to MOSI
> and pulling data from MISO into the RX FIFO.
> 4) Keep up with getting data from the Rx FIFO so one wouldn't get overflown.
> Regarding programming write each time. Well, it's up to the driver implementation.
> If opcode, address, dummy bytes and number of words to read are the same as before,
> then re-programming isn't required.
Ah, nice. This should be useful for far more than just flash - most
register reads will also be able to take advantage of this, they follow
a similar write then read pattern.
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prev parent reply other threads:[~2020-05-19 10:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 9:36 [PATCH 0/2] spi: Add Baikal-T1 System Boot SPI Controller driver Serge Semin
2020-05-08 9:36 ` [PATCH 1/2] dt-bindings: spi: Add Baikal-T1 System Boot SPI Controller binding Serge Semin
2020-05-18 15:26 ` Rob Herring
2020-05-18 21:27 ` Serge Semin
2020-05-21 14:57 ` Rob Herring
2020-05-21 15:11 ` Serge Semin
2020-05-21 21:35 ` Rob Herring
2020-05-18 21:55 ` Serge Semin
2020-05-08 9:36 ` [PATCH 2/2] spi: Add Baikal-T1 System Boot SPI Controller driver Serge Semin
2020-05-08 10:03 ` Andy Shevchenko
2020-05-08 10:15 ` Serge Semin
2020-05-08 10:22 ` Mark Brown
2020-05-08 15:42 ` Serge Semin
2020-05-08 17:07 ` Mark Brown
2020-05-08 10:26 ` Andy Shevchenko
2020-05-08 16:24 ` Serge Semin
2020-05-08 11:37 ` Mark Brown
2020-05-10 0:20 ` Serge Semin
2020-05-10 22:17 ` Chris Packham
2020-05-11 21:25 ` Mark Brown
2020-05-18 0:05 ` Serge Semin
2020-05-18 15:19 ` Mark Brown
2020-05-18 21:17 ` Serge Semin
2020-05-19 10:32 ` Mark Brown [this message]
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