On Tue, Jan 23, 2024 at 08:18:22PM +0800, Sui Jingfeng wrote:
> Hi,
>
>
> On 2024/1/23 09:18, Laurent Pinchart wrote:
> > On Tue, Jan 23, 2024 at 12:32:18AM +0800, Sui Jingfeng wrote:
> > > Which make it possible to use this driver on non-DT based systems,
> > > meanwhile, made no functional changes for DT based systems.
> > >
> > > Signed-off-by: Sui Jingfeng <sui.jingf...@linux.dev>
> > > ---
> > > drivers/gpu/drm/bridge/simple-bridge.c | 51 ++++++++++++++++++++++----
> > > 1 file changed, 44 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/bridge/simple-bridge.c
> > > b/drivers/gpu/drm/bridge/simple-bridge.c
> > > index 595f672745b9..cfea5a67cc5b 100644
> > > --- a/drivers/gpu/drm/bridge/simple-bridge.c
> > > +++ b/drivers/gpu/drm/bridge/simple-bridge.c
> > > @@ -184,6 +184,39 @@ static const void
> > > *simple_bridge_get_match_data(const struct device *dev)
> > > return NULL;
> > > }
> > > +static int simple_bridge_get_next_bridge_by_fwnode(struct device *dev,
> > > + struct drm_bridge
> > > **next_bridge)
> > > +{
> > > + struct drm_bridge *bridge;
> > > + struct fwnode_handle *ep;
> > > + struct fwnode_handle *remote;
> > > +
> > > + ep = fwnode_graph_get_endpoint_by_id(dev->fwnode, 1, 0, 0);
> > > + if (!ep) {
> > > + dev_err(dev, "The endpoint is unconnected\n");
> > > + return -EINVAL;
> > > + }
> > > +
> > > + remote = fwnode_graph_get_remote_port_parent(ep);
> > > + fwnode_handle_put(ep);
> > > + if (!remote) {
> > > + dev_err(dev, "No valid remote node\n");
> > > + return -ENODEV;
> > > + }
> > > +
> > > + bridge = drm_bridge_find_by_fwnode(remote);
> > > + fwnode_handle_put(remote);
> > > +
> > > + if (!bridge) {
> > > + dev_warn(dev, "Next bridge not found, deferring probe\n");
> > > + return -EPROBE_DEFER;
> > > + }
> > > +
> > > + *next_bridge = bridge;
> > > +
> > > + return 0;
> > > +}
> > > +
> > Hmmmm yes, this convinces me further that we should switch to fwnode,
> > not implement fwnode and OF side-by-side.
> >
>
> OK, I'm agree with you.
>
>
> But this means that I have to make the drm_bridge_find_by_fwnode() function
> works
> on both DT systems and non-DT systems. This is also means that we will no
> longer
> need to call of_drm_find_bridge() function anymore. This will eventually lead
> to
> completely remove of_drm_find_bridge()?
>
>
> As far as I can see, if I follow you suggestion, drm/bridge subsystem will
> encountering a *big* refactor. My 'side-by-side' approach allows co-exist.
> It is not really meant to purge OF. I feel it is a little bit of aggressive.
>
> hello Maxime, are you watching this? what do you think?It's indeed going to be a pretty big refactoring, but I agree with Laurent that we don't want to maintain both side by side. Maxime
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