linux-kernel - Re: [PATCH v11 3/9] drm/display: Add Type-C switch helpers

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Message-ID: <87k00vyop9.fsf@intel.com>
Date:   Mon, 06 Feb 2023 14:15:46 +0200
From:   Jani Nikula <jani.nikula@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Pin-yen Lin <treapking@...omium.org>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        linux-kernel@...r.kernel.org,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, Hsin-Yi Wang <hsinyi@...omium.org>,
        devicetree@...r.kernel.org, Allen Chen <allen.chen@....com.tw>,
        Lyude Paul <lyude@...hat.com>, linux-acpi@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Marek Vasut <marex@...x.de>,
        Xin Ji <xji@...logixsemi.com>,
        Stephen Boyd <swboyd@...omium.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Javier Martinez Canillas <javierm@...hat.com>,
        chrome-platform@...ts.linux.dev,
        Alex Deucher <alexander.deucher@....com>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Douglas Anderson <dianders@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Imre Deak <imre.deak@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH v11 3/9] drm/display: Add Type-C switch helpers

On Mon, 06 Feb 2023, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> On Sat, Feb 04, 2023 at 09:30:34PM +0800, Pin-yen Lin wrote:
>> Add helpers to register and unregister Type-C "switches" for bridges
>> capable of switching their output between two downstream devices.
>> 
>> The helper registers USB Type-C mode switches when the "mode-switch"
>> and the "reg" properties are available in Device Tree.
>
> ...
>
>> +	fwnode_for_each_child_node(port, sw) {
>> +		if (fwnode_property_present(sw, "mode-switch"))
>
> This idiom is being used at least twice (in this code, haven't checked the rest
> of the patches, though), perhaps
>
> #define fwnode_for_each_typec_mode_switch(port, sw)			\
> 	fwnode_for_each_child_node(port, sw)				\
> 		if (!fwnode_property_present(sw, "mode-switch")) {} else
>
> ?

See for_each_if() in drm_util.h.


BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center