From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: Chris Brandt <Chris.Brandt@renesas.com>,
Mark Brown <broonie@kernel.org>, Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@kernel.org>
Cc: "linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-renesas-soc@vger.kernel.org"
<linux-renesas-soc@vger.kernel.org>,
"linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>,
Mason Yang <masonccyang@mxic.com.tw>,
Boris Brezillon <bbrezillon@kernel.org>
Subject: Re: [PATCH v2 0/6] spi: Add Renesas SPIBSC controller
Date: Tue, 17 Dec 2019 22:44:14 +0300 [thread overview]
Message-ID: <90164352-6b74-ff78-261c-374f51f83330@cogentembedded.com> (raw)
In-Reply-To: <590840ce-a250-2512-3d04-c2420d83f7da@cogentembedded.com>
On 12/16/2019 11:31 PM, Sergei Shtylyov wrote:
[...]
>> My understanding is that HyperFlash uses standard CFI commands, so all
>
> The CFI command set driver needed some changes too (e.g. using the status
> register to determine if a command is done).
>
>> we need to do is register a CFI device in the driver, just like we
>> register a serial flash device.
>
>> (I guess I could go look at the sample code for our RTOS package and find out)
>>
>>>> library that you are proposing have a very different API than just
>>>> 'send bytes' and 'receive bytes'?
>>>
>>> There's "prepare" and "transfer" APIs and also "direct map read" API.
>
> The 1st one prepares the values to be written in either SPI mode or direct
> read mode registers. Then you can call "transfer" or "direct mao read" which
> would write out the register values into either set...
>
>> I wonder what is the value of the "direct map read" (other than XIP in
>> RZ/A systems). If you really want to directly access the flash (no
>> buffering though the MTD layer), you need to register as a mtd-rom device,
>> and then you don't really need an API at all.
>
> I'd leave this question to Boris, else I never complete this msg. :-)
Didn't really summon him, doing that now... :-)
>> Chris
MBR, Sergei
next prev parent reply other threads:[~2019-12-17 19:44 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-06 13:41 [PATCH v2 0/6] spi: Add Renesas SPIBSC controller Chris Brandt
2019-12-06 13:41 ` [PATCH v2 1/6] spi: Add SPIBSC driver Chris Brandt
2019-12-12 19:36 ` Sergei Shtylyov
2019-12-12 20:19 ` Chris Brandt
2019-12-13 10:01 ` Geert Uytterhoeven
2019-12-13 14:45 ` Chris Brandt
2019-12-13 14:48 ` Geert Uytterhoeven
2019-12-13 19:37 ` Sergei Shtylyov
2019-12-13 18:36 ` Sergei Shtylyov
2019-12-13 19:40 ` Sergei Shtylyov
2019-12-13 20:43 ` Chris Brandt
2019-12-16 18:47 ` Sergei Shtylyov
2019-12-06 13:41 ` [PATCH v2 2/6] dt-bindings: spi: Document Renesas SPIBSC bindings Chris Brandt
2019-12-09 14:09 ` Geert Uytterhoeven
2019-12-09 15:45 ` Chris Brandt
2019-12-09 19:34 ` Geert Uytterhoeven
2019-12-10 20:07 ` Sergei Shtylyov
2019-12-10 20:17 ` Geert Uytterhoeven
2019-12-10 20:33 ` Chris Brandt
2019-12-10 20:23 ` Chris Brandt
2019-12-06 13:41 ` [PATCH v2 3/6] clk: renesas: r7s9210: Add SPIBSC clock Chris Brandt
2019-12-06 18:40 ` Sergei Shtylyov
2019-12-06 19:49 ` Chris Brandt
2019-12-20 14:38 ` Geert Uytterhoeven
2019-12-20 14:50 ` Chris Brandt
2019-12-06 13:42 ` [PATCH v2 4/6] ARM: dts: r7s72100: Add SPIBSC devices Chris Brandt
2019-12-06 13:42 ` [PATCH v2 5/6] ARM: dts: r7s9210: Add SPIBSC device Chris Brandt
2019-12-06 13:42 ` [PATCH v2 6/6] ARM: dts: gr-peach: Enable SPIBSC Chris Brandt
2019-12-07 20:28 ` [PATCH v2 0/6] spi: Add Renesas SPIBSC controller Sergei Shtylyov
2019-12-09 15:10 ` Chris Brandt
2019-12-11 19:09 ` Sergei Shtylyov
2019-12-12 14:29 ` Chris Brandt
2019-12-12 15:28 ` Mark Brown
2019-12-12 16:53 ` Chris Brandt
2019-12-12 17:13 ` Mark Brown
2019-12-12 17:25 ` Chris Brandt
2019-12-16 15:21 ` Mark Brown
2019-12-16 20:31 ` Sergei Shtylyov
2019-12-16 22:21 ` Chris Brandt
2019-12-17 19:30 ` Sergei Shtylyov
2019-12-17 20:26 ` Geert Uytterhoeven
2019-12-19 16:57 ` Chris Brandt
2019-12-19 19:01 ` Sergei Shtylyov
2019-12-19 21:04 ` Chris Brandt
2019-12-20 1:45 ` masonccyang
2019-12-20 7:55 ` Geert Uytterhoeven
2019-12-24 16:58 ` Sergei Shtylyov
2019-12-27 0:58 ` Mark Brown
2019-12-17 19:44 ` Sergei Shtylyov [this message]
2019-12-18 8:09 ` Boris Brezillon
2019-12-19 16:32 ` Chris Brandt
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