linux-kernel - Re: [PATCH v2] drm/connector: Add of_drm_find

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Message-ID: <CAKMK7uFLPOkv_WkBbcJicqEWP9FFqHJ=0xt+SHwgghTSTuXgbg@mail.gmail.com>
Date:   Fri, 31 Jul 2020 08:17:19 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Andy Yan <andy.yan@...k-chips.com>
Cc:     Dave Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm/connector: Add of_drm_find_connector

On Fri, Jul 31, 2020 at 4:33 AM Andy Yan <andy.yan@...k-chips.com> wrote:
>
> ping
>
> On 7/3/20 5:45 PM, Andy Yan wrote:
> > Add a function to look up a connector by
> > device tree node, like what of_drm_find_bridge/panel
> > does.
> >
> > Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
> > Reported-by: kernel test robot <lkp@...el.com>

I'm pretty sure the answer is "no", but without a user for this it's
impossible to tell I guess. Always send out the patches using new
stuff together with the new stuff.
-Daniel

> >
> > ---
> >
> > Changes in v2:
> > - Add function declaration
> >
> >   drivers/gpu/drm/drm_connector.c | 33 +++++++++++++++++++++++++++++++++
> >   include/drm/drm_connector.h     | 14 ++++++++++++++
> >   2 files changed, 47 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> > index d877ddc6dc57..516376cd1868 100644
> > --- a/drivers/gpu/drm/drm_connector.c
> > +++ b/drivers/gpu/drm/drm_connector.c
> > @@ -743,6 +743,39 @@ void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)
> >   }
> >   EXPORT_SYMBOL(drm_connector_list_iter_end);
> >
> > +#ifdef CONFIG_OF
> > +/**
> > + * of_drm_find_connector - look up a connector using a device tree node
> > + * @np: device tree node of the connector
> > + *
> > + *
> > + * Return: A pointer to the connector which match the specified device tree
> > + * node or NULL if no panel matching the device tree node can be found, or
> > + * -ENODEV: the device is not available (status != "okay" or "ok")
> > + */
> > +struct drm_connector *of_drm_find_connector(struct drm_device *dev, const struct device_node *np)
> > +{
> > +     struct drm_connector *connector;
> > +     struct drm_connector_list_iter conn_iter;
> > +
> > +     if (!of_device_is_available(np))
> > +             return ERR_PTR(-ENODEV);
> > +
> > +     drm_connector_list_iter_begin(dev, &conn_iter);
> > +     drm_for_each_connector_iter(connector, &conn_iter) {
> > +             if (connector->of_node == np) {
> > +                     drm_connector_list_iter_end(&conn_iter);
> > +                     return connector;
> > +             }
> > +     }
> > +     drm_connector_list_iter_end(&conn_iter);
> > +
> > +     return NULL;
> > +}
> > +EXPORT_SYMBOL(of_drm_find_connector);
> > +#endif
> > +
> > +
> >   static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
> >       { SubPixelUnknown, "Unknown" },
> >       { SubPixelHorizontalRGB, "Horizontal RGB" },
> > diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> > index fd543d1db9b2..d249e0498375 100644
> > --- a/include/drm/drm_connector.h
> > +++ b/include/drm/drm_connector.h
> > @@ -1129,6 +1129,9 @@ struct drm_connector {
> >       /** @attr: sysfs attributes */
> >       struct device_attribute *attr;
> >
> > +     /** @of_node: device tree node */
> > +     struct device_node *of_node;
> > +
> >       /**
> >        * @head:
> >        *
> > @@ -1647,6 +1650,17 @@ void drm_connector_list_iter_end(struct drm_connector_list_iter *iter);
> >   bool drm_connector_has_possible_encoder(struct drm_connector *connector,
> >                                       struct drm_encoder *encoder);
> >
> > +#if defined(CONFIG_OF)
> > +struct drm_connector *
> > +of_drm_find_connector(struct drm_device *dev, const struct device_node *np);
> > +#else
> > +static inline struct drm_connector *
> > +of_drm_find_connector(struct drm_device *dev, const struct device_node *np)
> > +{
> > +     return ERR_PTR(-ENODEV);
> > +}
> > +#endif
> > +
> >   /**
> >    * drm_for_each_connector_iter - connector_list iterator macro
> >    * @connector: &struct drm_connector pointer used as cursor
>
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch