drm/bridge: tc358775: Register and attach our DSI device at probe

In order to avoid any probe ordering issue, the best practice is to move
the secondary MIPI-DSI device registration and attachment to the
MIPI-DSI host at probe time. Let's do this.
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20211025151536.1048186-20-maxime@cerno.tech

drivers/gpu/drm/bridge/tc358775.c

@@ -594,11 +594,26 @@ static int tc_bridge_attach(struct drm_bridge *bridge,
 			    enum drm_bridge_attach_flags flags)
 {
 	struct tc_data *tc = bridge_to_tc(bridge);
+
+	/* Attach the panel-bridge to the dsi bridge */
+	return drm_bridge_attach(bridge->encoder, tc->panel_bridge,
+				 &tc->bridge, flags);
+}
+
+static const struct drm_bridge_funcs tc_bridge_funcs = {
+	.attach = tc_bridge_attach,
+	.pre_enable = tc_bridge_pre_enable,
+	.enable = tc_bridge_enable,
+	.mode_valid = tc_mode_valid,
+	.post_disable = tc_bridge_post_disable,
+};
+
+static int tc_attach_host(struct tc_data *tc)
+{
 	struct device *dev = &tc->i2c->dev;
 	struct mipi_dsi_host *host;
 	struct mipi_dsi_device *dsi;
 	int ret;
-
 	const struct mipi_dsi_device_info info = { .type = "tc358775",
 							.channel = 0,
 							.node = NULL,
@@ -628,19 +643,9 @@ static int tc_bridge_attach(struct drm_bridge *bridge,
 		return ret;
 	}
 
-	/* Attach the panel-bridge to the dsi bridge */
-	return drm_bridge_attach(bridge->encoder, tc->panel_bridge,
-				 &tc->bridge, flags);
+	return 0;
 }
 
-static const struct drm_bridge_funcs tc_bridge_funcs = {
-	.attach = tc_bridge_attach,
-	.pre_enable = tc_bridge_pre_enable,
-	.enable = tc_bridge_enable,
-	.mode_valid = tc_mode_valid,
-	.post_disable = tc_bridge_post_disable,
-};
-
 static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
@@ -704,7 +709,15 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	i2c_set_clientdata(client, tc);
 
+	ret = tc_attach_host(tc);
+	if (ret)
+		goto err_bridge_remove;
+
 	return 0;
+
+err_bridge_remove:
+	drm_bridge_remove(&tc->bridge);
+	return ret;
 }
 
 static int tc_remove(struct i2c_client *client)