linux-kernel - Re: [PATCH v4 3/9] nvmem: core: add nvmem_device

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Message-ID: <20190816140942.GA15050@alpha.franken.de>
Date:   Fri, 16 Aug 2019 16:09:42 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Evgeniy Polyakov <zbr@...emap.net>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org, linux-rtc@...r.kernel.org,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH v4 3/9] nvmem: core: add nvmem_device_find

On Wed, Aug 14, 2019 at 01:52:49PM +0100, Srinivas Kandagatla wrote:
> On 14/08/2019 12:46, Thomas Bogendoerfer wrote:
> >On Tue, 13 Aug 2019 10:40:34 +0100
> >Srinivas Kandagatla <srinivas.kandagatla@...aro.org> wrote:
> >>On 09/08/2019 11:32, Thomas Bogendoerfer wrote:
> >>>nvmem_device_find provides a way to search for nvmem devices with
> >>>the help of a match function simlair to bus_find_device.
> >>>
> >>>Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> >>>---
> >>>   drivers/nvmem/core.c           | 62 ++++++++++++++++++++++--------------------
> >>>   include/linux/nvmem-consumer.h |  9 ++++++
> >>>   2 files changed, 41 insertions(+), 30 deletions(-)
> >>
> >>Have you considered using nvmem_register_notifier() ?
> >
> >yes, that was the first idea. But then I realized I need to build up
> >a private database of information already present in nvmem bus. So I
> >looked for a way to retrieve it from there. Unfortunately I couldn't
> >use bus_find_device directly, because nvmem_bus_type and struct nvmem_device
> >is hidden. So I refactured the lookup code and added a more universal
> >lookup function, which fits my needs and should be usable for more.
> I see your point.
> 
> overall the patch as it is look good, but recently we added more generic
> lookups for DT node, looks like part of your patch is un-doing generic
> device name lookup.
> 
> DT node match lookup is in https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/log/?h=generic_lookup_helpers

these patches are not in Linus tree, yet. I guess they will show up
in 5.4. No idea how to deal with it right now, do you ?

> Other missing bit is adding this api to documentation in
> ./Documentation/driver-api/nvmem.rst

ok, will do.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]