Messages in this thread | | | From | Janusz Krzysztofik <> | Subject | Re: [PATCH 5/6 v2] mtd: rawnand: ams-delta: use GPIO lookup table | Date | Wed, 30 May 2018 19:43:09 +0200 |
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On Wednesday, May 30, 2018 11:05:00 AM CEST Boris Brezillon wrote: > Hi Janusz,
Hi Boris,
> On Sat, 26 May 2018 00:20:45 +0200 > Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote: > > ... > > Changes since v1: > > - fix handling of devm_gpiod_get_optional() return values - thanks to > > Andy Shevchenko. > > Can you put the changelog after the "---" separator so that it does not > appear in the final commit message?
Yes, sure, sorry for that.
> > +err_gpiod: > > + if (err == -ENODEV || err == -ENOENT) > > + err = -EPROBE_DEFER; > > Hm, isn't it better to make gpiod_find() return ERR_PTR(-EPROBE_DEFER) > here [1]? At least, ENOENT should not be turned into EPROBE_DEFER, > because it's returned when there's no entry matching the requested gpio > in the lookup table, and deferring the probe won't solve this problem.
ENOENT is also returned when no matching lookup table is found. That may happen if consumer dev_name stored in the table differs from dev_name assigned to the consumer by its bus, the platform bus in this case. For that reason I think the consumer dev_name should be initialized in the table after the device is registered, when its actual dev_name can be obtained. If that device registration happens after the driver is already registered, e.g., at late_initcall, the device is probed before its lookup table is ready. For that reason returning EPROBE_DEFER seems better to me even in the ENOENT case.
Thanks, Janusz
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