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Date: Fri, 15 May 2015 11:17:07 +0100
From: Mark Rutland <mark.rutland@....com>
To: Brian Norris <computersforpeace@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>, Pawel Moll <Pawel.Moll@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Stephen Warren <swarren@...dotorg.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Marek Vasut <marex@...x.de>,
Rafał Miłecki <zajec5@...il.com>
Subject: Re: [PATCH] Documentation: dt: mtd: replace "nor-jedec" binding with
"jedec,spi-nor"
On Thu, May 14, 2015 at 06:32:53PM +0100, Brian Norris wrote:
> In commit 8ff16cf77ce3 ("Documentation: devicetree: m25p80: add "nor-jedec"
> binding"), we added a generic "nor-jedec" binding to catch all
> mostly-compatible SPI NOR flash which can be detected via the READ ID
> opcode (0x9F). This was discussed and reviewed at the time, however
> objections have come up since then as part of this discussion:
>
> http://lkml.kernel.org/g/20150511224646.GJ32500@ld-irv-0074
>
> It seems the parties involved agree that "jedec,spi-nor" does a better
> job of capturing the fact that this is SPI-specific, not just any NOR
> flash.
>
> This binding was only merged for v4.1-rc1, so it's still OK to change
> the naming.
>
> At the same time, let's move the documentation to a better name.
>
> Next up: prune the m25p_ids[] table to the minimal necessary listing, so
> we can stop referring to code (drivers/mtd/devices/m25p80.c) from the
> documentation.
>
> Signed-off-by: Brian Norris <computersforpeace@...il.com>
> Cc: Stephen Warren <swarren@...dotorg.org>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Marek Vasut <marex@...x.de>
> Cc: Rafał Miłecki <zajec5@...il.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Pawel Moll <pawel.moll@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
> Cc: Kumar Gala <galak@...eaurora.org>
> Cc: devicetree@...r.kernel.org
> ---
> I'd *really* like to get an 'ack' from a DT maintainer for this, those those
> are apparently very hard to come by. And I'd really not like to have to revisit
> this again in a few weeks. We have patches getting queued up for 4.2 that are
> using the "nor-jedec" binding, and I'd like to nip those in the bud ASAP.
This looks sane to me, and doesn't seem controversial.
So long as you can get this through before v4.1, you can add my ack:
Acked-by: Mark Rutland <mark.rutland@....com>
Thanks,
Mark.
>
> .../devicetree/bindings/mtd/{m25p80.txt => jedec,spi-nor.txt} | 6 +++---
> drivers/mtd/devices/m25p80.c | 6 +++---
> 2 files changed, 6 insertions(+), 6 deletions(-)
> rename Documentation/devicetree/bindings/mtd/{m25p80.txt => jedec,spi-nor.txt} (85%)
>
> diff --git a/Documentation/devicetree/bindings/mtd/m25p80.txt b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt
> similarity index 85%
> rename from Documentation/devicetree/bindings/mtd/m25p80.txt
> rename to Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt
> index f20b111b502a..2bee68103b01 100644
> --- a/Documentation/devicetree/bindings/mtd/m25p80.txt
> +++ b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.txt
> @@ -8,8 +8,8 @@ Required properties:
> is not Linux-only, but in case of Linux, see the "m25p_ids"
> table in drivers/mtd/devices/m25p80.c for the list of supported
> chips.
> - Must also include "nor-jedec" for any SPI NOR flash that can be
> - identified by the JEDEC READ ID opcode (0x9F).
> + Must also include "jedec,spi-nor" for any SPI NOR flash that can
> + be identified by the JEDEC READ ID opcode (0x9F).
> - reg : Chip-Select number
> - spi-max-frequency : Maximum frequency of the SPI bus the chip can operate at
>
> @@ -25,7 +25,7 @@ Example:
> flash: m25p80@0 {
> #address-cells = <1>;
> #size-cells = <1>;
> - compatible = "spansion,m25p80", "nor-jedec";
> + compatible = "spansion,m25p80", "jedec,spi-nor";
> reg = <0>;
> spi-max-frequency = <40000000>;
> m25p,fast-read;
> diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
> index 7c8b1694a134..3d59ebc16b6e 100644
> --- a/drivers/mtd/devices/m25p80.c
> +++ b/drivers/mtd/devices/m25p80.c
> @@ -223,7 +223,7 @@ static int m25p_probe(struct spi_device *spi)
> */
> if (data && data->type)
> flash_name = data->type;
> - else if (!strcmp(spi->modalias, "nor-jedec"))
> + else if (!strcmp(spi->modalias, "jedec,spi-nor"))
> flash_name = NULL; /* auto-detect */
> else
> flash_name = spi->modalias;
> @@ -255,7 +255,7 @@ static int m25p_remove(struct spi_device *spi)
> * since most of these flash are compatible to some extent, and their
> * differences can often be differentiated by the JEDEC read-ID command, we
> * encourage new users to add support to the spi-nor library, and simply bind
> - * against a generic string here (e.g., "nor-jedec").
> + * against a generic string here (e.g., "jedec,spi-nor").
> *
> * Many flash names are kept here in this list (as well as in spi-nor.c) to
> * keep them available as module aliases for existing platforms.
> @@ -305,7 +305,7 @@ static const struct spi_device_id m25p_ids[] = {
> * Generic support for SPI NOR that can be identified by the JEDEC READ
> * ID opcode (0x9F). Use this, if possible.
> */
> - {"nor-jedec"},
> + {"jedec,spi-nor"},
> { },
> };
> MODULE_DEVICE_TABLE(spi, m25p_ids);
> --
> 1.9.1
>
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