linux-kernel - Re: [PATCH] firmware: arm_scpi: Add hardware dependencies

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Message-ID: <7561802d-e9d3-2b82-35dc-465c06d6d4eb@arm.com>
Date:   Wed, 25 Jan 2017 13:56:23 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Jean Delvare <jdelvare@...e.de>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Jon Medhurst (Tixy)" <tixy@...aro.org>
Subject: Re: [PATCH] firmware: arm_scpi: Add hardware dependencies



On 25/01/17 13:50, Jean Delvare wrote:
> On Wed, 25 Jan 2017 13:38:47 +0000, Sudeep Holla wrote:
>> On 25/01/17 13:32, Jean Delvare wrote:
>>> With a name like that, I assume that the ARM SCPI protocol is only
>>> useful on the ARM architectures.
>>>
>>> Signed-off-by: Jean Delvare <jdelvare@...e.de>
>>> Fixes: 8f1498c03d15 ("firmware: arm_scpi: make it depend on MAILBOX instead of")
>>> Cc: Sudeep Holla <sudeep.holla@....com>
>>> Cc: Jon Medhurst (Tixy) <tixy@...aro.org>
>>> ---
>>> Please correct me if I'm wrong.
>>
>> I won't say you are wrong but the reason why it's named arm_scpi is
>> because the protocol was developed by ARM. It doesnn't mean only
>> ARM/ARM64 needs to use it, it can be used on any architecture for
>> inter-processor communication using any communication technique
>> (currently mailbox is the only supported in the driver)
> 
> OK, thanks for the clarification. In practice, what other architectures
> are using it?
> 

None, hence I didn't say you are wrong ;). I am fine having the check if
it breaks for any other architecture with COMPILE_TEST.

Also you have mentioned it fixes 8f1498c03d15, have you seen any
regression with that commit ? If so, details in the commit would be good.
-- 
Regards,
Sudeep