netdev - Re: [PATCH v2 01/29] nvmem: add support for cell lookups

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Date:   Tue, 28 Aug 2018 16:09:07 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Boris Brezillon <boris.brezillon@...tlin.com>,
        Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Andrew Lunn <andrew@...n.ch>,
        linux-doc <linux-doc@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Kevin Hilman <khilman@...nel.org>,
        Richard Weinberger <richard@....at>,
        Russell King <linux@...linux.org.uk>,
        Marek Vasut <marek.vasut@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        David Lechner <david@...hnology.com>,
        Arnd Bergmann <arnd@...db.de>,
        Sven Van Asbroeck <svendev@...x.com>,
        "open list:MEMORY TECHNOLOGY..." <linux-mtd@...ts.infradead.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lukas Wunner <lukas@...ner.de>, Naren <naren.kernel@...il.com>,
        netdev <netdev@...r.kernel.org>, Alban Bedel <albeu@...e.fr>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2 01/29] nvmem: add support for cell lookups



On 28/08/18 15:53, Boris Brezillon wrote:
> On Tue, 28 Aug 2018 16:41:04 +0200
> Bartosz Golaszewski <brgl@...ev.pl> wrote:
> 

...
> 
>>>
>>>   static struct nvmem_cell *nvmem_find_cell(const char *cell_id)
> 
> Can we get rid of this function and just have the the version that
> takes an nvmem_name and a cell_id.

That should be feasible!


>>>>>
>>>>> I hope you got the reason why of_nvmem_cell_get() always allocates new
>>>>> instance for every get!!
>>>>
>>>>
>>>>
>>>> I admit I didn't test it, but just from reading the code it seems like
>>>> in nvmem_cell_get() for DT-users we'll always get to
>>>> of_nvmem_cell_get() and in there we always end up calling line 873:
>>>> cell = kzalloc(sizeof(*cell), GFP_KERNEL);
>>>>   
>>> That is correct, this cell is created when we do a get and release when we
>>> do a put().
>>>   
>>
>> Shouldn't we add the cell to the list, and check first if it's there
>> and only create it if not?
> 
> Or even better: create the cells at registration time so that the
> search code is the same for both DT and non-DT cases. Only the
> registration would differ (with one path parsing the DT, and the other
> one searching for nvmem cells defined with a nvmem-provider-lookup
> table).
Makes sense! and that would go very well with the plan of "nvmem-cell" 
compatible for cells!.
>