linux-kernel - Re: [PATCH v15 01/10] device property: Add remote endpoint to devcon matcher

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Message-ID: <CAE-0n53Dw1tk0vVuToTwGYrKD76O_F97QgSGricBuvuPJnG60g@mail.gmail.com>
Date:   Fri, 7 Apr 2023 14:54:18 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Benson Leung <bleung@...omium.org>,
        Daniel Scally <djrscally@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Pin-yen Lin <treapking@...omium.org>,
        Prashant Malani <pmalani@...omium.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Robert Foss <rfoss@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Xin Ji <xji@...logixsemi.com>, Marek Vasut <marex@...x.de>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Lyude Paul <lyude@...hat.com>, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-acpi@...r.kernel.org,
        chrome-platform@...ts.linux.dev,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v15 01/10] device property: Add remote endpoint to devcon matcher

Quoting Pin-yen Lin (2023-03-31 02:11:36)
> From: Prashant Malani <pmalani@...omium.org>
>
> When searching the device graph for device matches, check the
> remote-endpoint itself for a match.
>
> Some drivers register devices for individual endpoints. This allows
> the matcher code to evaluate those for a match too, instead
> of only looking at the remote parent devices. This is required when a
> device supports two mode switches in its endpoints, so we can't simply
> register the mode switch with the parent node.

Looking at this in isolation I have no idea what a mode switch is and
how it is related to drivers/base/property.c. Can you expand on this
commit text? Maybe say two "usb typec mode switches"? And maybe include
an example graph node snippet?