Hello Morimoto-san, Thank you for the patch. On Tue, Feb 06, 2024 at 02:55:01AM +0000, Kuninori Morimoto wrote: > From DT point of view, in general, drivers should be asking for a > specific port number because their function is fixed in the binding. > > of_graph_get_next_endpoint() doesn't match to this concept. > > Simply replace > > - of_graph_get_next_endpoint(xxx, NULL); > + of_graph_get_endpoint_by_regs(xxx, 0, -1); > > Link: https://lore.kernel.org/r/20240202174941.GA310089-robh@xxxxxxxxxx > Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx> > --- > drivers/gpu/drm/drm_of.c | 2 +- > drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 2 +- > drivers/gpu/drm/tiny/arcpgu.c | 2 +- > 3 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c > index 177b600895d3..c2eae9296012 100644 > --- a/drivers/gpu/drm/drm_of.c > +++ b/drivers/gpu/drm/drm_of.c > @@ -516,7 +516,7 @@ struct mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev) > /* > * Get first endpoint child from device. > */ > - endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); > + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1); This assumes that the DSI device's port@0 will also be the input. That's fine for current users of this function, but we should at least document it. diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index 177b600895d3..012c4d04cf51 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -504,6 +504,8 @@ EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count_ep); * Gets parent DSI bus for a DSI device controlled through a bus other * than MIPI-DCS (SPI, I2C, etc.) using the Device Tree. * + * This function assumes that the device's port@0 is the DSI input. + * * Returns pointer to mipi_dsi_host if successful, -EINVAL if the * request is unsupported, -EPROBE_DEFER if the DSI host is found but * not available, or -ENODEV otherwise. With this, Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> > if (!endpoint) > return ERR_PTR(-ENODEV); > > diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c > index 4618c892cdd6..e10e469aa7a6 100644 > --- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c > +++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c > @@ -400,7 +400,7 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c) > rpi_touchscreen_i2c_write(ts, REG_POWERON, 0); > > /* Look up the DSI host. It needs to probe before we do. */ > - endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); > + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1); > if (!endpoint) > return -ENODEV; > > diff --git a/drivers/gpu/drm/tiny/arcpgu.c b/drivers/gpu/drm/tiny/arcpgu.c > index e5b10e41554a..04d0053b9315 100644 > --- a/drivers/gpu/drm/tiny/arcpgu.c > +++ b/drivers/gpu/drm/tiny/arcpgu.c > @@ -288,7 +288,7 @@ static int arcpgu_load(struct arcpgu_drm_private *arcpgu) > * There is only one output port inside each device. It is linked with > * encoder endpoint. > */ > - endpoint_node = of_graph_get_next_endpoint(pdev->dev.of_node, NULL); > + endpoint_node = of_graph_get_endpoint_by_regs(pdev->dev.of_node, 0, -1); > if (endpoint_node) { > encoder_node = of_graph_get_remote_port_parent(endpoint_node); > of_node_put(endpoint_node); -- Regards, Laurent Pinchart
