linux-kernel - Re: [PATCH v3 10/17] device property: Add remote endpoint to devcon matcher

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Message-ID: <ZsRt_I6y9MfWLawy@smile.fi.intel.com>
Date: Tue, 20 Aug 2024 13:20:44 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Stephen Boyd <swboyd@...omium.org>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev, devicetree@...r.kernel.org,
	Douglas Anderson <dianders@...omium.org>,
	Pin-yen Lin <treapking@...omium.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Benson Leung <bleung@...omium.org>,
	Conor Dooley <conor+dt@...nel.org>, Daniel Vetter <daniel@...ll.ch>,
	David Airlie <airlied@...il.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	dri-devel@...ts.freedesktop.org,
	Guenter Roeck <groeck@...omium.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Jonas Karlman <jonas@...boo.se>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Lee Jones <lee@...nel.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Prashant Malani <pmalani@...omium.org>,
	Robert Foss <rfoss@...nel.org>, Rob Herring <robh+dt@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Daniel Scally <djrscally@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Ivan Orlov <ivan.orlov0322@...il.com>, linux-acpi@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v3 10/17] device property: Add remote endpoint to devcon
 matcher

On Mon, Aug 19, 2024 at 03:38:24PM -0700, Stephen Boyd wrote:
> When a single DT node has a graph connected to more than one
> usb-c-connector node we can't differentiate which typec switch
> registered for the device is associated with the USB connector because
> the devcon matcher code assumes a 1:1 relationship between remote node
> and typec switch. Furthermore, we don't have a #typec-switch-cells
> property so there can only be one node per typec switch.
> 
> Support multiple USB typec switches exposed by one node by passing the
> remote endpoint node in addition to the remote node to the devcon
> matcher function (devcon_match_fn_t). With this change, typec switch
> drivers can register switches with the device node pointer for a graph
> endpoint so that they can support more than one typec switch if
> necessary. Either way, a DT property like 'mode-switch' is always in the
> graph's parent node and not in the endpoint node.

> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Daniel Scally <djrscally@...il.com>
> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Vinod Koul <vkoul@...nel.org>
> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: Ivan Orlov <ivan.orlov0322@...il.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
> Cc: Conor Dooley <conor+dt@...nel.org>
> Cc: <devicetree@...r.kernel.org>
> Cc: <linux-usb@...r.kernel.org>
> Cc: <linux-acpi@...r.kernel.org>
> Cc: Pin-yen Lin <treapking@...omium.org>

Move these after --- line below.

...

>  drivers/base/property.c     | 7 +++++--

The changes here are fine to me.

...

>  include/linux/property.h    | 5 +++--

> -typedef void *(*devcon_match_fn_t)(const struct fwnode_handle *fwnode, const char *id,
> -				   void *data);
> +typedef void *(*devcon_match_fn_t)(const struct fwnode_handle *fwnode,
> +				   const struct fwnode_handle *endpoint,
> +				   const char *id, void *data);

Seems there is no explanation of the parameters here, can we add a kernel-doc
to this typedef (may be a separate patch)?

-- 
With Best Regards,
Andy Shevchenko