linux-kernel - Re: [PATCH 1/2] remoteproc: core: Add rproc OF look-up functions

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Date:	Fri, 12 Aug 2016 11:37:06 -0500
From:	Suman Anna <s-anna@...com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Bjorn Andersson <bjorn.andersson@...aro.org>,
	Tony Lindgren <tony@...mide.com>,
	"ohad@...ery.com" <ohad@...ery.com>,
	"kernel@...inux.com" <kernel@...inux.com>,
	"linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
	"patrice.chotard@...com" <patrice.chotard@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ludovic.barre@...com" <ludovic.barre@...com>,
	"ssantosh@...nel.org" <ssantosh@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Dave Gerlach <d-gerlach@...com>
Subject: Re: [PATCH 1/2] remoteproc: core: Add rproc OF look-up functions

Hi Bjorn,

>> On 08/11/2016 02:31 AM, Lee Jones wrote:
>>> On Wed, 10 Aug 2016, Suman Anna wrote:
>>>
>>>> On 08/10/2016 04:19 PM, Bjorn Andersson wrote:
>>>>> On Wed 10 Aug 14:04 PDT 2016, Suman Anna wrote:
>>>>>
>>>>>> On 08/10/2016 03:40 PM, Bjorn Andersson wrote:
>>>>>>> On Wed 10 Aug 12:37 PDT 2016, Suman Anna wrote:
>>>>>>>
>>>>>>>> Hi Lee, Bjorn,
>>>>>>>>
>>>>>>>> On 08/10/2016 12:40 PM, Bjorn Andersson wrote:
>>>>>>>>> On Tue 19 Jul 08:49 PDT 2016, Lee Jones wrote:
>>>>>>>>>
>>>>>>>>>> - of_rproc_by_index(): look-up and obtain a reference to a rproc
>>>>>>>>>>                        using the DT phandle "rprocs" and a index.
>>>>>>>>>>
>>>>>>>>>> - of_rproc_by_name():  lookup and obtain a reference to a rproc
>>>>>>>>>>                        using the DT phandle "rprocs" and "rproc-names".
>>>>>>>>>>
>>>>>>>>>> Signed-off-by: Ludovic Barre <ludovic.barre@...com>
>>>>>>>>>> Signed-off-by: Lee Jones <lee.jones@...aro.org>
>>>>>>>>>> ---
>>>>>>>>>
>>>>>>>>> I'm happy with this, so I whipped up a binding document describing our
>>>>>>>>> two new properties. Waiting for an opinion on that before I merge this.

One last comment on this is the return code convention change on these
rproc_get APIs. I am fine in general with returning ERR_PTRs, but most
of the remoteproc code is using NULL checking for rproc. If you remember
the discussion back during the hwspinlock DT conversion [1], Ohad
preferred to return NULL, and that's why even the rproc_get_by_phandle
was returning NULL. We ought to make this consistent across the board if
we want to make this switch.

regards
Suman

[1] http://marc.info/?t=138965891200008