drm/fsl-dcu: rework codes to support of_graph dt binding for panel

This patch rework the output code to add of_graph dt binding support
for panel device and also keeps the backward compatibility

Signed-off-by: Meng Yi <meng.yi@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stefan Agner <stefan@agner.ch>

diff --git a/Documentation/devicetree/bindings/display/fsl,dcu.txt b/Documentation/devicetree/bindings/display/fsl,dcu.txt
index ae55cde..63ec2a6 100644 (file)
--- a/Documentation/devicetree/bindings/display/fsl,dcu.txt
+++ b/Documentation/devicetree/bindings/display/fsl,dcu.txt
@@ -12,7 +12,7 @@ Required properties:
 - clock-names:         Should be "dcu" and "pix"
                        See ../clocks/clock-bindings.txt for details.
 - big-endian           Boolean property, LS1021A DCU registers are big-endian.
-- fsl,panel:           The phandle to panel node.
+- port                 Video port for the panel output
 
 Optional properties:
 - fsl,tcon:            The phandle to the timing controller node.
@@ -24,6 +24,11 @@ dcu: dcu@2ce0000 {
        clocks = <&platform_clk 0>, <&platform_clk 0>;
        clock-names = "dcu", "pix";
        big-endian;
-       fsl,panel = <&panel>;
        fsl,tcon = <&tcon>;
+
+       port {
+               dcu_out: endpoint {
+                       remote-endpoint = <&panel_out>;
+            };
+       };
 };

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c
index a6e4cd5..d9d6cc1 100644 (file)
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_kms.c
@@ -43,7 +43,7 @@ int fsl_dcu_drm_modeset_init(struct fsl_dcu_drm_device *fsl_dev)
        if (ret)
                goto err;
 
-       ret = fsl_dcu_drm_connector_create(fsl_dev, &fsl_dev->encoder);
+       ret = fsl_dcu_create_outputs(fsl_dev);
        if (ret)
                goto err;
 

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h
index 7093109..5a7b88e 100644 (file)
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_output.h
@@ -25,9 +25,8 @@ to_fsl_dcu_connector(struct drm_connector *con)
                     : NULL;
 }
 
-int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
-                                struct drm_encoder *encoder);
 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
                               struct drm_crtc *crtc);
+int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev);
 
 #endif /* __FSL_DCU_DRM_CONNECTOR_H__ */

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
index 0b0989e..32eff99 100644 (file)
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/backlight.h>
+#include <linux/of_graph.h>
 
 #include <drm/drmP.h>
 #include <drm/drm_atomic_helper.h>
@@ -132,12 +133,12 @@ static const struct drm_connector_helper_funcs connector_helper_funcs = {
        .mode_valid = fsl_dcu_drm_connector_mode_valid,
 };
 
-int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
-                                struct drm_encoder *encoder)
+static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
+                                struct drm_panel *panel)
 {
+       struct drm_encoder *encoder = &fsl_dev->encoder;
        struct drm_connector *connector = &fsl_dev->connector.base;
        struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;
-       struct device_node *panel_node;
        int ret;
 
        fsl_dev->connector.encoder = encoder;
@@ -161,21 +162,7 @@ int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
                                      mode_config->dpms_property,
                                      DRM_MODE_DPMS_OFF);
 
-       panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
-       if (!panel_node) {
-               dev_err(fsl_dev->dev, "fsl,panel property not found\n");
-               ret = -ENODEV;
-               goto err_sysfs;
-       }
-
-       fsl_dev->connector.panel = of_drm_find_panel(panel_node);
-       if (!fsl_dev->connector.panel) {
-               ret = -EPROBE_DEFER;
-               goto err_panel;
-       }
-       of_node_put(panel_node);
-
-       ret = drm_panel_attach(fsl_dev->connector.panel, connector);
+       ret = drm_panel_attach(panel, connector);
        if (ret) {
                dev_err(fsl_dev->dev, "failed to attach panel\n");
                goto err_sysfs;
@@ -183,11 +170,52 @@ int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
 
        return 0;
 
-err_panel:
-       of_node_put(panel_node);
 err_sysfs:
        drm_connector_unregister(connector);
 err_cleanup:
        drm_connector_cleanup(connector);
        return ret;
 }
+
+static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
+                                  const struct of_endpoint *ep)
+{
+       struct device_node *np;
+
+       np = of_graph_get_remote_port_parent(ep->local_node);
+
+       fsl_dev->connector.panel = of_drm_find_panel(np);
+       of_node_put(np);
+       if (fsl_dev->connector.panel)
+               return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
+
+       return -ENODEV;
+}
+
+int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
+{
+       struct of_endpoint ep;
+       struct device_node *ep_node, *panel_node;
+       int ret;
+
+       /* This is for backward compatibility */
+       panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
+       if (panel_node) {
+               fsl_dev->connector.panel = of_drm_find_panel(panel_node);
+               of_node_put(panel_node);
+               if (!fsl_dev->connector.panel)
+                       return -EPROBE_DEFER;
+               return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
+       }
+
+       ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL);
+       if (!ep_node)
+               return -ENODEV;
+
+       ret = of_graph_parse_endpoint(ep_node, &ep);
+       of_node_put(ep_node);
+       if (ret)
+               return -ENODEV;
+
+       return fsl_dcu_attach_endpoint(fsl_dev, &ep);
+}