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

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Message-ID: <abae5c30-62ab-55c7-a144-cb8707832941@ti.com>
Date:	Fri, 12 Aug 2016 13:45:22 -0500
From:	Suman Anna <s-anna@...com>
To:	Bjorn Andersson <bjorn.andersson@...aro.org>
CC:	Lee Jones <lee.jones@...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

On 08/12/2016 01:07 PM, Bjorn Andersson wrote:
> On Fri 12 Aug 09:37 PDT 2016, Suman Anna wrote:
> 
>> 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.
>>
> 
> I think it makes sense to return the actual error from these functions,
> if nothing else to keep it consistent with other frameworks.
> 
> The other case I see returning NULL is rproc_alloc(), which is think is
> analog to kmalloc(), so I think that's fine to keep.
> 
> Luckily wkup_m3 is the only consumer of this API in the kernel today, so
> we shouldn't have any issues wrt changing the return value here.

Yeah, not worried about the consumers, I am talking about the few
functions in remoteproc core code that do some checking like in
rproc_del(), __rproc_boot() or rproc_report_crash(). We would need to
modify these to use IS_ERR_OR_NULL instead of a NULL check atleast.

regards
Suman

> 
>> regards
>> Suman
>>
>> [1] http://marc.info/?t=138965891200008
> 
> Regards,
> Bjorn
>