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Date: Wed, 3 Apr 2024 09:43:27 -0700
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Subject: Re: [PATCH v0 02/14] drm/amdgpu,drm/radeon: Make I2C terminology more
 inclusive
To: =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>,
 Jani Nikula <jani.nikula@linux.intel.com>,
 =?UTF-8?B?VmlsbGUgU3lyasOkbMOk?= <ville.syrjala@linux.intel.com>,
 Andi Shyti <andi.shyti@linux.intel.com>
Cc: Alex Deucher <alexander.deucher@amd.com>, "Pan, Xinhui"
 <Xinhui.Pan@amd.com>, David Airlie <airlied@gmail.com>,
 Daniel Vetter <daniel@ffwll.ch>, Harry Wentland <harry.wentland@amd.com>,
 Leo Li <sunpeng.li@amd.com>, Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>,
 Evan Quan <evan.quan@amd.com>, Hawking Zhang <Hawking.Zhang@amd.com>,
 Candice Li <candice.li@amd.com>, Ran Sun <sunran001@208suo.com>,
 Alexander Richards <electrodeyt@gmail.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>,
 Neil Armstrong <neil.armstrong@linaro.org>,
 Heiner Kallweit <hkallweit1@gmail.com>, Hamza Mahfooz
 <hamza.mahfooz@amd.com>, Ruan Jinjie <ruanjinjie@huawei.com>,
 Alan Liu <haoping.liu@amd.com>, Aurabindo Pillai <aurabindo.pillai@amd.com>,
 Wayne Lin <wayne.lin@amd.com>, Samson Tam <samson.tam@amd.com>,
 Alvin Lee <alvin.lee2@amd.com>, Charlene Liu <charlene.liu@amd.com>,
 Sohaib Nadeem <sohaib.nadeem@amd.com>, Lewis Huang <lewis.huang@amd.com>,
 Tom Chung <chiahsuan.chung@amd.com>,
 Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>,
 Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>,
 George Shen <george.shen@amd.com>, Aric Cyr <aric.cyr@amd.com>,
 Jun Lei <jun.lei@amd.com>, Nicholas Kazlauskas
 <nicholas.kazlauskas@amd.com>, Qingqing Zhuo <Qingqing.Zhuo@amd.com>,
 Dillon Varone <dillon.varone@amd.com>, Le Ma <Le.Ma@amd.com>,
 Lijo Lazar <lijo.lazar@amd.com>, Asad kamal <asad.kamal@amd.com>,
 Kenneth Feng <kenneth.feng@amd.com>, Ma Jun <Jun.Ma2@amd.com>,
 Mario Limonciello <mario.limonciello@amd.com>,
 Yang Wang <kevinyang.wang@amd.com>, Darren Powell <darren.powell@amd.com>,
 Yifan Zhang <yifan1.zhang@amd.com>,
 "open list:RADEON and AMDGPU DRM DRIVERS" <amd-gfx@lists.freedesktop.org>,
 "open list:DRM DRIVERS" <dri-devel@lists.freedesktop.org>,
 open list <linux-kernel@vger.kernel.org>, Wolfram Sang <wsa@kernel.org>
References: <20240329170038.3863998-1-eahariha@linux.microsoft.com>
 <20240329170038.3863998-3-eahariha@linux.microsoft.com>
 <Zgb3VYsgLjhJ2HKs@ashyti-mobl2.lan>
 <ceeaafe1-49d5-4602-8251-eed63a1be2b6@linux.microsoft.com>
 <Zgb8gieDzZtZmg2q@ashyti-mobl2.lan> <Zg1NW0jqwFn4lvEP@intel.com>
 <87sf02d1zf.fsf@intel.com> <53f3afba-4759-4ea1-b408-8a929b26280c@amd.com>
Content-Language: en-CA
From: Easwar Hariharan <eahariha@linux.microsoft.com>
In-Reply-To: <53f3afba-4759-4ea1-b408-8a929b26280c@amd.com>
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On 4/3/2024 7:26 AM, Christian König wrote:
> Am 03.04.24 um 15:12 schrieb Jani Nikula:
>> On Wed, 03 Apr 2024, Ville Syrjälä <ville.syrjala@linux.intel.com> wrote:
>>> On Fri, Mar 29, 2024 at 06:38:10PM +0100, Andi Shyti wrote:
>>>> Hi,
>>>>
>>>> On Fri, Mar 29, 2024 at 10:28:14AM -0700, Easwar Hariharan wrote:
>>>>> On 3/29/2024 10:16 AM, Andi Shyti wrote:
>>>>>> Hi Easwar,
>>>>>>
>>>>>> On Fri, Mar 29, 2024 at 05:00:26PM +0000, Easwar Hariharan wrote:
>>>>>>> I2C v7, SMBus 3.2, and I3C specifications have replaced "master/slave"
>>>>>> I don't understand why we forget that i3c is 1.1.1 :-)
>>>>> That's because it's a copy-paste error from Wolfram's cover letter. :) I'll update
>>>>> next go-around.
>>>> not a binding comment, though. Just for completeness, because we
>>>> are giving the version to the i2c and smbus, but not i3c.
>>>>
>>>>>>> with more appropriate terms. Inspired by and following on to Wolfram's
>>>>>>> series to fix drivers/i2c/[1], fix the terminology for users of
>>>>>>> I2C_ALGOBIT bitbanging interface, now that the approved verbiage exists
>>>>>>> in the specification.
>>>>>> The specification talks about:
>>>>>>
>>>>>>   - master -> controller
>>>>>>   - slave -> target (and not client)
>>>>>>
>>>>>> But both you and Wolfram have used client. I'd like to reach
>>>>>> some more consistency here.
>>>>> I had the impression that remote targets (i.e external to the device) were to be called clients,
>>>>> e.g. the QSFP FRUs in drivers/infiniband, and internal ones targets.
>>>>> I chose the terminology according to that understanding, but now I can't find where I got that
>>>>> information.
>>>> The word "client" does not even appear in the documentation (only
>>>> one instance in the i3c document), so that the change is not
>>>> related to the document as stated in the commit log. Unless, of
>>>> course, I am missing something.
>>>>
>>>> I'm OK with choosing a "customized" naming, but we need to reach
>>>> an agreement.
>>>>
>>>> I raised the same question to Wolfram.
>>> I don't know where that discussion happened, but my opinion
>>> is NAK to "client". Life is already confusing enough with
>>> these renames, so let's not make it even more confusing by
>>> inventing new names nowhere to be found in the spec.
>>>
>>> And let's especially not invent names that don't even fit
>>> the purpose. "Client" makes me think of "client/server" or
>>> some real world analogy. Neither of which seem to have any
>>> resemblence to how the term would be used for i2c.
>> Agreed.
>>
>> I2C 7.0, I3C 1.1.1, and SMBus 3.2 have all switched to controller/target
>> terminology. The SMBus spec has additionally converted generic host
>> references to controller.
>>
>> At least for i915 where I have some say in the matter, controller/target
>> it shall be.
> 
> +1 for using the same vocabulary in amdgpu as in the specifications.
> 
> My personal opinion is that master/slave was actually a pretty good description of the relationship.
> 
> The "slave" or rather target of the communication is forced into operation, can't speak back and potentially won't get any payment for the serving.
> 
> If we remove the word slave from our vocabulary society will just sooner or later start to forget the meaning, and that is probably not a good thing.
> 
> Regards,
> Christian.
> 

Thanks for the review, Christian. I'll adapt to controller/target in v1.

Thanks,
Easwar