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 <20220422222351.1297276-2-bjorn.andersson@linaro.org> <CAHp75VdT7FYpoxV8RD6J-ujHuDnj0GWswDx6wCyCyz9cozkQ7Q@mail.gmail.com>
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From:   "Rafael J. Wysocki" <rafael@kernel.org>
Date:   Fri, 6 May 2022 20:21:14 +0200
Message-ID: <CAJZ5v0grpObZMb+C6ResOnmVMZmiHf9NYBtVQzsTRSP_Wn8t=g@mail.gmail.com>
Subject: Re: [PATCH v5 1/7] device property: Add helper to match multiple connections
To:     Andy Shevchenko <andy.shevchenko@gmail.com>,
        Bjorn Andersson <bjorn.andersson@linaro.org>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Daniel Scally <djrscally@gmail.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Hans de Goede <hdegoede@redhat.com>,
        USB <linux-usb@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>
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On Tue, Apr 26, 2022 at 12:15 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Sat, Apr 23, 2022 at 1:25 AM Bjorn Andersson
> <bjorn.andersson@linaro.org> wrote:
> >
> > In some cases multiple connections with the same connection id
> > needs to be resolved from a fwnode graph.
> >
> > One such example is when separate hardware is used for performing muxing
> > and/or orientation switching of the SuperSpeed and SBU lines in a USB
> > Type-C connector. In this case the connector needs to belong to a graph
> > with multiple matching remote endpoints, and the Type-C controller needs
> > to be able to resolve them both.
> >
> > Add a new API that allows this kind of lookup.
>
> LGTM now,
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> thanks!

For this and the next patch in the series:

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

and please feel free to route the whole lot via USB.

Thanks!

> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> > ---
> >
> > Changes since v4:
> > - Added "Add" to patch subject
> > - Added "(Optional)" kernel-doc of fwnode_connection_find_matches()
> >
> >  drivers/base/property.c  | 109 +++++++++++++++++++++++++++++++++++++++
> >  include/linux/property.h |   5 ++
> >  2 files changed, 114 insertions(+)
> >
> > diff --git a/drivers/base/property.c b/drivers/base/property.c
> > index 36401cfe432c..babab8cec7a0 100644
> > --- a/drivers/base/property.c
> > +++ b/drivers/base/property.c
> > @@ -1201,6 +1201,40 @@ fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
> >         return NULL;
> >  }
> >
> > +static unsigned int fwnode_graph_devcon_matches(struct fwnode_handle *fwnode,
> > +                                               const char *con_id, void *data,
> > +                                               devcon_match_fn_t match,
> > +                                               void **matches,
> > +                                               unsigned int matches_len)
> > +{
> > +       struct fwnode_handle *node;
> > +       struct fwnode_handle *ep;
> > +       unsigned int count = 0;
> > +       void *ret;
> > +
> > +       fwnode_graph_for_each_endpoint(fwnode, ep) {
> > +               if (matches && count >= matches_len) {
> > +                       fwnode_handle_put(ep);
> > +                       break;
> > +               }
> > +
> > +               node = fwnode_graph_get_remote_port_parent(ep);
> > +               if (!fwnode_device_is_available(node)) {
> > +                       fwnode_handle_put(node);
> > +                       continue;
> > +               }
> > +
> > +               ret = match(node, con_id, data);
> > +               fwnode_handle_put(node);
> > +               if (ret) {
> > +                       if (matches)
> > +                               matches[count] = ret;
> > +                       count++;
> > +               }
> > +       }
> > +       return count;
> > +}
> > +
> >  static void *
> >  fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
> >                     void *data, devcon_match_fn_t match)
> > @@ -1223,6 +1257,37 @@ fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
> >         return NULL;
> >  }
> >
> > +static unsigned int fwnode_devcon_matches(struct fwnode_handle *fwnode,
> > +                                         const char *con_id, void *data,
> > +                                         devcon_match_fn_t match,
> > +                                         void **matches,
> > +                                         unsigned int matches_len)
> > +{
> > +       struct fwnode_handle *node;
> > +       unsigned int count = 0;
> > +       unsigned int i;
> > +       void *ret;
> > +
> > +       for (i = 0; ; i++) {
> > +               if (matches && count >= matches_len)
> > +                       break;
> > +
> > +               node = fwnode_find_reference(fwnode, con_id, i);
> > +               if (IS_ERR(node))
> > +                       break;
> > +
> > +               ret = match(node, NULL, data);
> > +               fwnode_handle_put(node);
> > +               if (ret) {
> > +                       if (matches)
> > +                               matches[count] = ret;
> > +                       count++;
> > +               }
> > +       }
> > +
> > +       return count;
> > +}
> > +
> >  /**
> >   * fwnode_connection_find_match - Find connection from a device node
> >   * @fwnode: Device node with the connection
> > @@ -1250,3 +1315,47 @@ void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
> >         return fwnode_devcon_match(fwnode, con_id, data, match);
> >  }
> >  EXPORT_SYMBOL_GPL(fwnode_connection_find_match);
> > +
> > +/**
> > + * fwnode_connection_find_matches - Find connections from a device node
> > + * @fwnode: Device node with the connection
> > + * @con_id: Identifier for the connection
> > + * @data: Data for the match function
> > + * @match: Function to check and convert the connection description
> > + * @matches: (Optional) array of pointers to fill with matches
> > + * @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.
> > + * If @matches is NULL @matches_len is ignored and the total number of resolved
> > + * matches is returned.
> > + *
> > + * Return: Number of matches resolved, or negative errno.
> > + */
> > +int fwnode_connection_find_matches(struct fwnode_handle *fwnode,
> > +                                  const char *con_id, void *data,
> > +                                  devcon_match_fn_t match,
> > +                                  void **matches, unsigned int matches_len)
> > +{
> > +       unsigned int count_graph;
> > +       unsigned int count_ref;
> > +
> > +       if (!fwnode || !match)
> > +               return -EINVAL;
> > +
> > +       count_graph = fwnode_graph_devcon_matches(fwnode, con_id, data, match,
> > +                                                 matches, matches_len);
> > +
> > +       if (matches) {
> > +               matches += count_graph;
> > +               matches_len -= count_graph;
> > +       }
> > +
> > +       count_ref = fwnode_devcon_matches(fwnode, con_id, data, match,
> > +                                         matches, matches_len);
> > +
> > +       return count_graph + count_ref;
> > +}
> > +EXPORT_SYMBOL_GPL(fwnode_connection_find_matches);
> > diff --git a/include/linux/property.h b/include/linux/property.h
> > index fc24d45632eb..a5b429d623f6 100644
> > --- a/include/linux/property.h
> > +++ b/include/linux/property.h
> > @@ -451,6 +451,11 @@ static inline void *device_connection_find_match(struct device *dev,
> >         return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match);
> >  }
> >
> > +int fwnode_connection_find_matches(struct fwnode_handle *fwnode,
> > +                                  const char *con_id, void *data,
> > +                                  devcon_match_fn_t match,
> > +                                  void **matches, unsigned int matches_len);
> > +
> >  /* -------------------------------------------------------------------------- */
> >  /* Software fwnode support - when HW description is incomplete or missing */
> >
> > --
> > 2.35.1
> >
>
>
> --
> With Best Regards,
> Andy Shevchenko