linux-kernel - Re: [PATCH 0/2] Associate ddc adapters with connectors

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Date:   Tue, 25 Jun 2019 12:14:27 +0200
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     linux-samsung-soc@...r.kernel.org,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Inki Dae <inki.dae@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Kukjin Kim <kgene@...nel.org>, dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel@...ll.ch>, kernel@...labora.com,
        Sean Paul <sean@...rly.run>,
        linux-arm-kernel@...ts.infradead.org, m.szyprowski@...sung.com
Subject: Re: [PATCH 0/2] Associate ddc adapters with connectors

Hi Russell,

W dniu 25.06.2019 o 12:03, Russell King - ARM Linux admin pisze:
> On Tue, Jun 25, 2019 at 11:46:34AM +0200, Andrzej Pietrasiewicz wrote:
>> It is difficult for a user to know which of the i2c adapters is for which
>> drm connector. This series addresses this problem.
>>
>> The idea is to have a symbolic link in connector's sysfs directory, e.g.:
>>
>> ls -l /sys/class/drm/card0-HDMI-A-1/i2c-2
>> lrwxrwxrwx 1 root root 0 Jun 24 10:42 /sys/class/drm/card0-HDMI-A-1/i2c-2 \
>> 	-> ../../../../soc/13880000.i2c/i2c-2
> 
> Don't you want the symlink name to be "i2c" or something fixed, rather
> than the name of the i2c adapter?  Otherwise, you seem to be encumbering
> userspace with searching the directory to try and find the symlink.
> 

Thank you for your comment. So you imagine something on the lines of:

lrwxrwxrwx 1 root root 0 Jun 24 10:42 /sys/class/drm/card0-HDMI-A-1/ddc \
  	-> ../../../../soc/13880000.i2c/i2c-2

?

This makes sense to me, I will send a v2.

Andrzej