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Message-ID: <ZAg5i0thWrx6gf7B@kuha.fi.intel.com>
Date: Wed, 8 Mar 2023 09:30:19 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Pin-yen Lin <treapking@...omium.org>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.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>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Daniel Scally <djrscally@...il.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>,
Xin Ji <xji@...logixsemi.com>,
Javier Martinez Canillas <javierm@...hat.com>,
Lyude Paul <lyude@...hat.com>, linux-kernel@...r.kernel.org,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
chrome-platform@...ts.linux.dev,
Nícolas F . R . A . Prado
<nfraprado@...labora.com>, Marek Vasut <marex@...x.de>,
Hsin-Yi Wang <hsinyi@...omium.org>, devicetree@...r.kernel.org,
Allen Chen <allen.chen@....com.tw>,
dri-devel@...ts.freedesktop.org,
Thomas Zimmermann <tzimmermann@...e.de>,
Stephen Boyd <swboyd@...omium.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v13 01/10] device property: Add remote endpoint to devcon
matcher
On Fri, Mar 03, 2023 at 10:33:41PM +0800, Pin-yen Lin wrote:
> 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.
>
> Signed-off-by: Prashant Malani <pmalani@...omium.org>
> Signed-off-by: Pin-yen Lin <treapking@...omium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>
> Changes in v13:
> - Update the kernel doc of fwnode_connection_find_match
>
> Changes in v12:
> - Check the availability of the device node in fwnode_graph_devcon_matches
> - Ensured valid access to "matches" in fwnode_graph_devcon_matches
> - Updated the documentation in fwnode_connection_find_match(es)
> - Dropped collected tags due to the new changes
>
> Changes in v11:
> - Added missing fwnode_handle_put in drivers/base/property.c
>
> Changes in v10:
> - Collected Reviewed-by and Tested-by tags
>
> Changes in v6:
> - New in v6
>
> drivers/base/property.c | 31 ++++++++++++++++++++++++++-----
> 1 file changed, 26 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index 083a95791d3b..4426ac2b16ca 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -1243,6 +1243,23 @@ static unsigned int fwnode_graph_devcon_matches(const struct fwnode_handle *fwno
> continue;
> }
>
> + ret = match(node, con_id, data);
> + fwnode_handle_put(node);
> + if (ret) {
> + if (matches)
> + matches[count] = ret;
> + count++;
> +
> + if (matches && count >= matches_len)
> + break;
> + }
> +
> + /*
> + * Some drivers may register devices for endpoints. Check
> + * the remote-endpoints for matches in addition to the remote
> + * port parent.
> + */
> + node = fwnode_graph_get_remote_endpoint(ep);
> ret = match(node, con_id, data);
> fwnode_handle_put(node);
> if (ret) {
> @@ -1293,8 +1310,11 @@ static unsigned int fwnode_devcon_matches(const struct fwnode_handle *fwnode,
> * @match: Function to check and convert the connection description
> *
> * Find a connection with unique identifier @con_id between @fwnode and another
> - * device node. @match will be used to convert the connection description to
> - * data the caller is expecting to be returned.
> + * device node. For fwnode graph connections, the graph endpoints are also
> + * checked. @match will be used to convert the connection description to data
> + * the caller is expecting to be returned.
> + *
> + * Return: The pointer to the matched node, or NULL on error.
> */
> void *fwnode_connection_find_match(const struct fwnode_handle *fwnode,
> const char *con_id, void *data,
> @@ -1325,9 +1345,10 @@ EXPORT_SYMBOL_GPL(fwnode_connection_find_match);
> * @matches_len: Length of @matches
> *
> * Find up to @matches_len connections with unique identifier @con_id between
> - * @fwnode and other device nodes. @match will be used to convert the
> - * connection description to data the caller is expecting to be returned
> - * through the @matches array.
> + * @fwnode and other device nodes. For fwnode graph connections, the graph
> + * endpoints are also checked. @match will be used to convert the connection
> + * description to data the caller is expecting to be returned through the
> + * @matches array.
> * If @matches is NULL @matches_len is ignored and the total number of resolved
> * matches is returned.
> *
> --
> 2.40.0.rc0.216.gc4246ad0f0-goog
--
heikki
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