[PATCH v9 07/18] drm: bridge: samsung-dsim: Lookup OF-graph or Child node devices

[Jagan Teki]

On Sun, Dec 11, 2022 at 7:58 AM Marek Vasut <marex at denx.de> wrote:
>
> On 12/9/22 16:23, Jagan Teki wrote:
> > The child devices in MIPI DSI can be binding with OF-graph
> > and also via child nodes.
> >
> > The OF-graph interface represents the child devices via
> > remote and associated endpoint numbers like
> >
> > dsi {
> >     compatible = "fsl,imx8mm-mipi-dsim";
> >
> >     ports {
> >       port at 0 {
> >            reg = <0>;
> >
> >            dsi_in_lcdif: endpoint at 0 {
> >                 reg = <0>;
> >                 remote-endpoint = <&lcdif_out_dsi>;
> >            };
> >       };
> >
> >       port at 1 {
> >            reg = <1>;
> >
> >            dsi_out_bridge: endpoint {
> >                 remote-endpoint = <&bridge_in_dsi>;
> >            };
> >       };
> > };
> >
> > The child node interface represents the child devices via
> > conventional child nodes on given DSI parent like
> >
> > dsi {
> >     compatible = "samsung,exynos5433-mipi-dsi";
> >
> >     ports {
> >          port at 0 {
> >               reg = <0>;
> >
> >               dsi_to_mic: endpoint {
> >                    remote-endpoint = <&mic_to_dsi>;
> >               };
> >          };
> >     };
> >
> >     panel at 0 {
> >          reg = <0>;
> >     };
> > };
> >
> > As Samsung DSIM bridge is common DSI IP across all Exynos DSI
> > and NXP i.MX8M host controllers, this patch adds support to
> > lookup the child devices whether its bindings on the associated
> > host represent OF-graph or child node interfaces.
> >
> > v9, v8, v7, v6, v5, v4, v3:
> > * none
> >
> > v2:
> > * new patch
>
> This looks like a good candidate for common/helper code which can be
> reused by other similar drivers.

Yes, I have responded to the same comment of yours in v7 [1]. It is
hard to make this code work in a generic way.

[1] https://lore.kernel.org/all/CAMty3ZBtRZ-vDPQYX+m8uWmsD+vmbFOnCGVba8swQ8GWtWaKJQ@mail.gmail.com/