[PATCH] dt-bindings: mtd: jedec,spi-nor: Document support for more MT25QU parts

Geert Uytterhoeven geert at linux-m68k.org
Fri Dec 2 05:56:01 PST 2022

Hi Michael,

On Fri, Dec 2, 2022 at 2:50 PM Michael Walle <michael at walle.cc> wrote:
> Am 2022-12-02 14:37, schrieb Geert Uytterhoeven:
> > Document support for the Micron MT25QU256A and MT25QU512A Serial NOR
> > FLASHes.
> >
> > Merge the new entries with the existing entry for MT25QU02G.
> >
> > Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
> > ---
> > mt25qu512a is already in active use, causing "make dtbs_check" errors.
> > mt25qu256a is supported by the Linux spi-nor driver, but there are no
> > upstream users yet.
> Is it encouraged to use the specific compatible with SPI-NOR flashes?
> As far as I know it isn't. The spi-nor subsys tries hard to identify
> any flashes at runtime and any additional information in the device tree
> is used as a last resort (just for flashes which doesn't support the
> read jedec id command yet). And usually boards have different sources
> for flash chips, so hardcoding a particular part in the device tree
> doesn't make sense.

Thanks, I am aware there have been pushbacks when trying to
document more compatible values.

IMHO either all or none of them should be documented.
If device-specific compatible values are discouraged, the bindings
should be updated to reflect that, and document a single compatible
value ("jedec,spi-nor") only.



Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at 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

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