linux-kernel - Re: [PATCH v3 4/4] soc: Add SoC driver for Freescale Vybrid platform

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Date:	Fri, 27 May 2016 10:28:45 -0700
From:	Stefan Agner <stefan@...er.ch>
To:	maitysanchayan@...il.com
Cc:	Arnd Bergmann <arnd@...db.de>, Rob Herring <robh@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] soc: Add SoC driver for Freescale Vybrid platform

On 2016-05-27 03:08, maitysanchayan@...il.com wrote:
> On 16-05-27 10:31:55, Arnd Bergmann wrote:
>> On Friday, May 27, 2016 12:03:01 PM CEST maitysanchayan@...il.com wrote:
>> >
>> > So if I understand correctly, the binding at the SoC level is fine.
>> > Keeping that but removing the additional made-up properties, viz. below
>> >
>> > rom-revision: phandle to the on-chip ROM node
>> > mscm: phandle to the MSCM CPU configuration node
>> > nvmem-cells: phandles to two OCOTP child nodes ocotp_cfg0 and ocotp_cfg1
>> > nvmem-cell-names: should contain string names "cfg0" and "cfg1"
>> >
>> > would be fine?
>> >
>> > We would have something similar to here
>> > http://www.spinics.net/lists/devicetree/msg80655.html
>> >
>> > but now with the DT binding under SoC bus.
>> >
>>
>>
>> You look up the OTP device as a syscon here, which seems odd since there
>> is already an nvmem driver for it. Shouldn't you use the nvmem API for
>> that?
>>
>> 	Arnd
> 
> I need the following 
> 
> nvmem-cells: phandles to two OCOTP child nodes ocotp_cfg0 and ocotp_cfg1
> nvmem-cell-names: should contain string names "cfg0" and "cfg1"
> 
> to be able to use the NVMEM consumer API.

I did not tested it, but it seems the NVMEM consumer API has some kind
of non-DT fallback:
http://lxr.free-electrons.com/source/drivers/nvmem/core.c#L827

Right now, it seems to me that it does not handle the case where we have
a of_node but don't want to use it... You might need to add some extra
handling if there is a of_node without nvmem-cell-names/nvmem-cells, and
fall back to nvmem_cell_get_from_list.

--
Stefan