From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Boris Brezillon <bbrezillon@kernel.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
MTD Maling List <linux-mtd@lists.infradead.org>,
Nguyen An Hoan <na-hoan@jinso.co.jp>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-spi <linux-spi@vger.kernel.org>
Subject: Re: [PATCH v2 0/2] eeprom: at25: SPI transfer improvements
Date: Wed, 23 Jan 2019 19:10:56 +0100 [thread overview]
Message-ID: <CAMuHMdUWqcB7cTOenASWt6HXZhGsr9cH9B55Sh-+rmWmAkm4Fg@mail.gmail.com> (raw)
In-Reply-To: <20190118230740.44239fcf@bbrezillon>
Hi Boris,
On Fri, Jan 18, 2019 at 11:07 PM Boris Brezillon <bbrezillon@kernel.org> wrote:
> On Fri, 18 Jan 2019 15:05:23 +0100
> Geert Uytterhoeven <geert+renesas@glider.be> wrote:
> > This patch series contains two improvements for the AT25 SPI EEPROM
> > driver, related to SPI transfers.
> >
> > Changes compared to v1:
> > - Merge "off" and "offset" into a single variable instead of just
> > killing the cast, as suggested by Arnd,
> > - Add Acked-by,
> > - Dropped "[PATCH 3/3] eeprom: at25: Split writes in two SPI transfers
> > to optimize DMA", as this is better implemented in the SPI
> > controller driver (cfr. e.g. "[v2 PATCH 2/2] spi: sh-msiof: Use DMA
> > if possible",
> > https://lore.kernel.org/linux-renesas-soc/1547803771-9564-2-git-send-email-na-hoan@jinso.co.jp/)
> >
> > Tested on a Renesas Ebisu development board with R-Car E3 using MSIOF
> > and a 25LC040 EEPROM.
>
> Did you consider converting this driver to spimem? Looks like the
> protocol used to communicate with the memory resembles the one used on
> SPI NANDs/NORs and fits pretty well in the spi_mem_op representation.
No, I hadn't considered doing that ;-)
> By doing this conversion you'd allow people to connect an AT25 EEPROM
> to an advanced SPI controller that does not support regular SPI
> transfers and you wouldn't have to forge SPI messages manually.
>
> Here is a patch (only compile tested) doing that. The diffstat is not in
> favor of this conversion, but I find the resulting code cleaner and more
> future proof.
Thanks, will give it a try, eventually...
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
WARNING: multiple messages have this Message-ID (diff)
From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Boris Brezillon <bbrezillon@kernel.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-spi <linux-spi@vger.kernel.org>,
Nguyen An Hoan <na-hoan@jinso.co.jp>,
MTD Maling List <linux-mtd@lists.infradead.org>
Subject: Re: [PATCH v2 0/2] eeprom: at25: SPI transfer improvements
Date: Wed, 23 Jan 2019 19:10:56 +0100 [thread overview]
Message-ID: <CAMuHMdUWqcB7cTOenASWt6HXZhGsr9cH9B55Sh-+rmWmAkm4Fg@mail.gmail.com> (raw)
In-Reply-To: <20190118230740.44239fcf@bbrezillon>
Hi Boris,
On Fri, Jan 18, 2019 at 11:07 PM Boris Brezillon <bbrezillon@kernel.org> wrote:
> On Fri, 18 Jan 2019 15:05:23 +0100
> Geert Uytterhoeven <geert+renesas@glider.be> wrote:
> > This patch series contains two improvements for the AT25 SPI EEPROM
> > driver, related to SPI transfers.
> >
> > Changes compared to v1:
> > - Merge "off" and "offset" into a single variable instead of just
> > killing the cast, as suggested by Arnd,
> > - Add Acked-by,
> > - Dropped "[PATCH 3/3] eeprom: at25: Split writes in two SPI transfers
> > to optimize DMA", as this is better implemented in the SPI
> > controller driver (cfr. e.g. "[v2 PATCH 2/2] spi: sh-msiof: Use DMA
> > if possible",
> > https://lore.kernel.org/linux-renesas-soc/1547803771-9564-2-git-send-email-na-hoan@jinso.co.jp/)
> >
> > Tested on a Renesas Ebisu development board with R-Car E3 using MSIOF
> > and a 25LC040 EEPROM.
>
> Did you consider converting this driver to spimem? Looks like the
> protocol used to communicate with the memory resembles the one used on
> SPI NANDs/NORs and fits pretty well in the spi_mem_op representation.
No, I hadn't considered doing that ;-)
> By doing this conversion you'd allow people to connect an AT25 EEPROM
> to an advanced SPI controller that does not support regular SPI
> transfers and you wouldn't have to forge SPI messages manually.
>
> Here is a patch (only compile tested) doing that. The diffstat is not in
> favor of this conversion, but I find the resulting code cleaner and more
> future proof.
Thanks, will give it a try, eventually...
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2019-01-23 18:11 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-18 14:05 [PATCH v2 0/2] eeprom: at25: SPI transfer improvements Geert Uytterhoeven
2019-01-18 14:05 ` Geert Uytterhoeven
2019-01-18 14:05 ` [PATCH v2 1/2] eeprom: at25: Merge "off" and "offset" in at25_ee_write() Geert Uytterhoeven
2019-01-18 14:05 ` Geert Uytterhoeven
2019-01-26 10:06 ` Boris Brezillon
2019-01-26 10:06 ` Boris Brezillon
2019-01-18 14:05 ` [PATCH v2 2/2] eeprom: at25: Use spi_message_init_with_transfers() instead of open coding Geert Uytterhoeven
2019-01-18 14:05 ` Geert Uytterhoeven
2019-01-26 10:06 ` Boris Brezillon
2019-01-26 10:06 ` Boris Brezillon
2019-01-18 22:07 ` [PATCH v2 0/2] eeprom: at25: SPI transfer improvements Boris Brezillon
2019-01-18 22:07 ` Boris Brezillon
2019-01-23 18:10 ` Geert Uytterhoeven [this message]
2019-01-23 18:10 ` Geert Uytterhoeven
2019-01-29 19:02 ` Geert Uytterhoeven
2019-01-29 19:02 ` Geert Uytterhoeven
2019-01-30 14:50 ` Greg Kroah-Hartman
2019-01-30 14:50 ` Greg Kroah-Hartman
2019-01-30 15:08 ` Boris Brezillon
2019-01-30 15:08 ` Boris Brezillon
2019-01-30 19:40 ` Greg Kroah-Hartman
2019-01-30 19:40 ` Greg Kroah-Hartman
2019-01-30 14:55 ` Boris Brezillon
2019-01-30 14:55 ` Boris Brezillon
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