[PATCH RFC v2 2/3] drm/dsi: Add API to register simulated DSI panel

[Jessica Zhang]

Add new APIs to register a simulated DSI panel.

If the panel_simulation module is enabled, the DSI host will register
the sim panel instead of the physical panel.

Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 2bc3973d35a19fc7dff7d578636821a1059bb7f9..95498b9bb8953066b0b1e9cfaa99d0b5b53e6cc8 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -153,6 +153,24 @@ static int mipi_dsi_device_add(struct mipi_dsi_device *dsi)
 	return device_add(&dsi->dev);
 }
 
+#if IS_ENABLED(CONFIG_DRM_PANEL_SIMULATION)
+static struct mipi_dsi_device *mipi_dsi_device_add_sim_panel(struct mipi_dsi_host *host)
+{
+	struct mipi_dsi_device_info info = { };
+
+	info.channel = 0;
+	info.node = NULL;
+	strscpy(info.type, "panel_simulation", sizeof(info.type));
+
+	return mipi_dsi_device_register_full(host, &info);
+}
+#else
+static struct mipi_dsi_device *mipi_dsi_device_add_sim_panel(struct mipi_dsi_host *host)
+{
+	return ERR_PTR(-ENODEV);
+}
+#endif
+
 #if IS_ENABLED(CONFIG_OF)
 static struct mipi_dsi_device *
 of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
@@ -324,10 +342,28 @@ struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node)
 }
 EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node);
 
+static int mipi_dsi_host_register_sim_panel(struct mipi_dsi_host *host)
+{
+	struct mipi_dsi_device *ret;
+
+	ret = mipi_dsi_device_add_sim_panel(host);
+	if (IS_ERR(ret))
+		return -EPROBE_DEFER;
+
+	mutex_lock(&host_lock);
+	list_add_tail(&host->list, &host_list);
+	mutex_unlock(&host_lock);
+
+	return 0;
+}
+
 int mipi_dsi_host_register(struct mipi_dsi_host *host)
 {
 	struct device_node *node;
 
+	if (!mipi_dsi_host_register_sim_panel(host))
+		return 0;
+
 	for_each_available_child_of_node(host->dev->of_node, node) {
 		/* skip nodes without reg property */
 		if (!of_property_present(node, "reg"))

-- 
2.34.1