Merge branch 'linux-4.1.0-rc5-tilcdc-refactor' of https://github.com/jsarha/linux into drm-next

Please pull the contents of "Use DRM component API in tilcdc to
connect to tda998x" patch series.

* 'linux-4.1.0-rc5-tilcdc-refactor' of https://github.com/jsarha/linux:
  drm/tilcdc: Force building of DRM_TILCDC_SLAVE_COMPAT
  drm/tilcdc: Add DRM_TILCDC_SLAVE_COMPAT for ti,tilcdc,slave binding support
  drm/tilcdc: use pm_runtime_irq_safe()
  drm/tilcdc: Add support for external tda998x encoder
  drm/tilcdc: Remove tilcdc slave support for tda998x driver
  drm/tilcdc: Fix module unloading

Documentation/devicetree/bindings/drm/tilcdc/slave.txt

-Device-Tree bindings for tilcdc DRM encoder slave output driver
-
-Required properties:
- - compatible: value should be "ti,tilcdc,slave".
- - i2c: the phandle for the i2c device the encoder slave is connected to
-
-Recommended properties:
- - pinctrl-names, pinctrl-0: the pincontrol settings to configure
-   muxing properly for pins that connect to TFP410 device
-
-Example:
-
-	hdmi {
-		compatible = "ti,tilcdc,slave";
-		i2c = <&i2c0>;
-		pinctrl-names = "default";
-		pinctrl-0 = <&nxp_hdmi_bonelt_pins>;
-	};

Documentation/devicetree/bindings/drm/tilcdc/tilcdc.txt

@@ -18,6 +18,12 @@ Optional properties:
  - max-pixelclock: The maximum pixel clock that can be supported
    by the lcd controller in KHz.
 
+Optional nodes:
+
+ - port/ports: to describe a connection to an external encoder. The
+   binding follows Documentation/devicetree/bindings/graph.txt and
+   suppors a single port with a single endpoint.
+
 Example:
 
 	fb: fb@4830e000 {
@@ -26,4 +32,25 @@ Example:
 		interrupt-parent = <&intc>;
 		interrupts = <36>;
 		ti,hwmods = "lcdc";
+
+		port {
+			lcdc_0: endpoint@0 {
+				remote-endpoint = <&hdmi_0>;
+			};
+		};
+	};
+
+	tda19988: tda19988 {
+		compatible = "nxp,tda998x";
+		reg = <0x70>;
+
+		pinctrl-names = "default", "off";
+		pinctrl-0 = <&nxp_hdmi_bonelt_pins>;
+		pinctrl-1 = <&nxp_hdmi_bonelt_off_pins>;
+
+		port {
+			hdmi_0: endpoint@0 {
+				remote-endpoint = <&lcdc_0>;
+			};
+		};
 	};

drivers/gpu/drm/Makefile

@@ -58,7 +58,7 @@ obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel-hlcdc/
 obj-$(CONFIG_DRM_RCAR_DU) += rcar-du/
 obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/
 obj-$(CONFIG_DRM_OMAP)	+= omapdrm/
-obj-$(CONFIG_DRM_TILCDC)	+= tilcdc/
+obj-y			+= tilcdc/
 obj-$(CONFIG_DRM_QXL) += qxl/
 obj-$(CONFIG_DRM_BOCHS) += bochs/
 obj-$(CONFIG_DRM_MSM) += msm/

drivers/gpu/drm/tilcdc/Kconfig

@@ -12,3 +12,15 @@ config DRM_TILCDC
 	  Choose this option if you have an TI SoC with LCDC display
 	  controller, for example AM33xx in beagle-bone, DA8xx, or
 	  OMAP-L1xx.  This driver replaces the FB_DA8XX fbdev driver.
+
+config DRM_TILCDC_SLAVE_COMPAT
+	bool "Support device tree blobs using TI LCDC Slave binding"
+	depends on DRM_TILCDC
+	default y
+	select OF_RESOLVE
+	select OF_OVERLAY
+	help
+	  Choose this option if you need a kernel that is compatible
+	  with device tree blobs using the obsolete "ti,tilcdc,slave"
+	  binding. If you find "ti,tilcdc,slave"-string from your DTB,
+	  you probably need this. Otherwise you do not.

drivers/gpu/drm/tilcdc/Makefile

@@ -3,11 +3,14 @@ ifeq (, $(findstring -W,$(EXTRA_CFLAGS)))
 	ccflags-y += -Werror
 endif
 
+obj-$(CONFIG_DRM_TILCDC_SLAVE_COMPAT) += tilcdc_slave_compat.o \
+					 tilcdc_slave_compat.dtb.o
+
 tilcdc-y := \
 	tilcdc_crtc.o \
 	tilcdc_tfp410.o \
-	tilcdc_slave.o \
 	tilcdc_panel.o \
+	tilcdc_external.o \
 	tilcdc_drv.o
 
 obj-$(CONFIG_DRM_TILCDC)	+= tilcdc.o

drivers/gpu/drm/tilcdc/tilcdc_crtc.c

@@ -37,6 +37,9 @@ struct tilcdc_crtc {
 
 	/* for deferred fb unref's: */
 	struct drm_flip_work unref_work;
+
+	/* Only set if an external encoder is connected */
+	bool simulate_vesa_sync;
 };
 #define to_tilcdc_crtc(x) container_of(x, struct tilcdc_crtc, base)
 
@@ -135,11 +138,12 @@ static void stop(struct drm_crtc *crtc)
 	tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 }
 
+static void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode);
 static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
 {
 	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 
-	WARN_ON(tilcdc_crtc->dpms == DRM_MODE_DPMS_ON);
+	tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 
 	drm_crtc_cleanup(crtc);
 	drm_flip_work_cleanup(&tilcdc_crtc->unref_work);
@@ -213,6 +217,28 @@ static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
 		const struct drm_display_mode *mode,
 		struct drm_display_mode *adjusted_mode)
 {
+	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
+
+	if (!tilcdc_crtc->simulate_vesa_sync)
+		return true;
+
+	/*
+	 * tilcdc does not generate VESA-compliant sync but aligns
+	 * VS on the second edge of HS instead of first edge.
+	 * We use adjusted_mode, to fixup sync by aligning both rising
+	 * edges and add HSKEW offset to fix the sync.
+	 */
+	adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
+	adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
+
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
+		adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
+		adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
+	} else {
+		adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
+		adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
+	}
+
 	return true;
 }
 
@@ -533,6 +559,14 @@ void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 	tilcdc_crtc->info = info;
 }
 
+void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
+					bool simulate_vesa_sync)
+{
+	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
+
+	tilcdc_crtc->simulate_vesa_sync = simulate_vesa_sync;
+}
+
 void tilcdc_crtc_update_clk(struct drm_crtc *crtc)
 {
 	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);

drivers/gpu/drm/tilcdc/tilcdc_drv.c

@@ -17,16 +17,17 @@
 
 /* LCDC DRM driver, based on da8xx-fb */
 
+#include <linux/component.h>
+
 #include "tilcdc_drv.h"
 #include "tilcdc_regs.h"
 #include "tilcdc_tfp410.h"
-#include "tilcdc_slave.h"
 #include "tilcdc_panel.h"
+#include "tilcdc_external.h"
 
 #include "drm_fb_helper.h"
 
 static LIST_HEAD(module_list);
-static bool slave_probing;
 
 void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
 		const struct tilcdc_module_ops *funcs)
@@ -42,11 +43,6 @@ void tilcdc_module_cleanup(struct tilcdc_module *mod)
 	list_del(&mod->list);
 }
 
-void tilcdc_slave_probedefer(bool defered)
-{
-	slave_probing = defered;
-}
-
 static struct of_device_id tilcdc_of_match[];
 
 static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
@@ -80,13 +76,6 @@ static int modeset_init(struct drm_device *dev)
 		mod->funcs->modeset_init(mod, dev);
 	}
 
-	if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
-		/* oh nos! */
-		dev_err(dev->dev, "no encoders/connectors found\n");
-		drm_mode_config_cleanup(dev);
-		return -ENXIO;
-	}
-
 	dev->mode_config.min_width = 0;
 	dev->mode_config.min_height = 0;
 	dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
@@ -121,6 +110,8 @@ static int tilcdc_unload(struct drm_device *dev)
 {
 	struct tilcdc_drm_private *priv = dev->dev_private;
 
+	tilcdc_remove_external_encoders(dev);
+
 	drm_fbdev_cma_fini(priv->fbdev);
 	drm_kms_helper_poll_fini(dev);
 	drm_mode_config_cleanup(dev);
@@ -171,6 +162,9 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 
 	dev->dev_private = priv;
 
+	priv->is_componentized =
+		tilcdc_get_external_components(dev->dev, NULL) > 0;
+
 	priv->wq = alloc_ordered_workqueue("tilcdc", 0);
 	if (!priv->wq) {
 		ret = -ENOMEM;
@@ -233,6 +227,7 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 	DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
 
 	pm_runtime_enable(dev->dev);
+	pm_runtime_irq_safe(dev->dev);
 
 	/* Determine LCD IP Version */
 	pm_runtime_get_sync(dev->dev);
@@ -260,10 +255,28 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 		goto fail_cpufreq_unregister;
 	}
 
+	platform_set_drvdata(pdev, dev);
+
+	if (priv->is_componentized) {
+		ret = component_bind_all(dev->dev, dev);
+		if (ret < 0)
+			goto fail_mode_config_cleanup;
+
+		ret = tilcdc_add_external_encoders(dev, &bpp);
+		if (ret < 0)
+			goto fail_component_cleanup;
+	}
+
+	if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
+		dev_err(dev->dev, "no encoders/connectors found\n");
+		ret = -ENXIO;
+		goto fail_external_cleanup;
+	}
+
 	ret = drm_vblank_init(dev, 1);
 	if (ret < 0) {
 		dev_err(dev->dev, "failed to initialize vblank\n");
-		goto fail_mode_config_cleanup;
+		goto fail_external_cleanup;
 	}
 
 	pm_runtime_get_sync(dev->dev);
@@ -274,9 +287,6 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 		goto fail_vblank_cleanup;
 	}
 
-	platform_set_drvdata(pdev, dev);
-
-
 	list_for_each_entry(mod, &module_list, list) {
 		DBG("%s: preferred_bpp: %d", mod->name, mod->preferred_bpp);
 		bpp = mod->preferred_bpp;
@@ -307,6 +317,13 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 fail_mode_config_cleanup:
 	drm_mode_config_cleanup(dev);
 
+fail_component_cleanup:
+	if (priv->is_componentized)
+		component_unbind_all(dev->dev, dev);
+
+fail_external_cleanup:
+	tilcdc_remove_external_encoders(dev);
+
 fail_cpufreq_unregister:
 	pm_runtime_disable(dev->dev);
 #ifdef CONFIG_CPU_FREQ
@@ -612,24 +629,56 @@ static const struct dev_pm_ops tilcdc_pm_ops = {
  * Platform driver:
  */
 
+static int tilcdc_bind(struct device *dev)
+{
+	return drm_platform_init(&tilcdc_driver, to_platform_device(dev));
+}
+
+static void tilcdc_unbind(struct device *dev)
+{
+	drm_put_dev(dev_get_drvdata(dev));
+}
+
+static const struct component_master_ops tilcdc_comp_ops = {
+	.bind = tilcdc_bind,
+	.unbind = tilcdc_unbind,
+};
+
 static int tilcdc_pdev_probe(struct platform_device *pdev)
 {
+	struct component_match *match = NULL;
+	int ret;
+
 	/* bail out early if no DT data: */
 	if (!pdev->dev.of_node) {
 		dev_err(&pdev->dev, "device-tree data is missing\n");
 		return -ENXIO;
 	}
 
-	/* defer probing if slave is in deferred probing */
-	if (slave_probing == true)
-		return -EPROBE_DEFER;
-
-	return drm_platform_init(&tilcdc_driver, pdev);
+	ret = tilcdc_get_external_components(&pdev->dev, &match);
+	if (ret < 0)
+		return ret;
+	else if (ret == 0)
+		return drm_platform_init(&tilcdc_driver, pdev);
+	else
+		return component_master_add_with_match(&pdev->dev,
+						       &tilcdc_comp_ops,
+						       match);
 }
 
 static int tilcdc_pdev_remove(struct platform_device *pdev)
 {
-	drm_put_dev(platform_get_drvdata(pdev));
+	struct drm_device *ddev = dev_get_drvdata(&pdev->dev);
+	struct tilcdc_drm_private *priv = ddev->dev_private;
+
+	/* Check if a subcomponent has already triggered the unloading. */
+	if (!priv)
+		return 0;
+
+	if (priv->is_componentized)
+		component_master_del(&pdev->dev, &tilcdc_comp_ops);
+	else
+		drm_put_dev(platform_get_drvdata(pdev));
 
 	return 0;
 }
@@ -654,7 +703,6 @@ static int __init tilcdc_drm_init(void)
 {
 	DBG("init");
 	tilcdc_tfp410_init();
-	tilcdc_slave_init();
 	tilcdc_panel_init();
 	return platform_driver_register(&tilcdc_platform_driver);
 }
@@ -664,7 +712,6 @@ static void __exit tilcdc_drm_fini(void)
 	DBG("fini");
 	platform_driver_unregister(&tilcdc_platform_driver);
 	tilcdc_panel_fini();
-	tilcdc_slave_fini();
 	tilcdc_tfp410_fini();
 }
 

drivers/gpu/drm/tilcdc/tilcdc_drv.h

@@ -85,6 +85,9 @@ struct tilcdc_drm_private {
 
 	unsigned int num_connectors;
 	struct drm_connector *connectors[8];
+	const struct drm_connector_helper_funcs *connector_funcs[8];
+
+	bool is_componentized;
 };
 
 /* Sub-module for display.  Since we don't know at compile time what panels
@@ -116,7 +119,6 @@ struct tilcdc_module {
 void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
 		const struct tilcdc_module_ops *funcs);
 void tilcdc_module_cleanup(struct tilcdc_module *mod);
-void tilcdc_slave_probedefer(bool defered);
 
 /* Panel config that needs to be set in the crtc, but is not coming from
  * the mode timings.  The display module is expected to call
@@ -166,6 +168,8 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc);
 void tilcdc_crtc_update_clk(struct drm_crtc *crtc);
 void tilcdc_crtc_set_panel_info(struct drm_crtc *crtc,
 		const struct tilcdc_panel_info *info);
+void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
+					bool simulate_vesa_sync);
 int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode);
 int tilcdc_crtc_max_width(struct drm_crtc *crtc);
 

drivers/gpu/drm/tilcdc/tilcdc_external.c

+/*
+ * Copyright (C) 2015 Texas Instruments
+ * Author: Jyri Sarha <jsarha@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ */
+
+#include <linux/component.h>
+#include <linux/of_graph.h>
+
+#include "tilcdc_drv.h"
+#include "tilcdc_external.h"
+
+static const struct tilcdc_panel_info panel_info_tda998x = {
+		.ac_bias                = 255,
+		.ac_bias_intrpt         = 0,
+		.dma_burst_sz           = 16,
+		.bpp                    = 16,
+		.fdd                    = 0x80,
+		.tft_alt_mode           = 0,
+		.invert_pxl_clk		= 1,
+		.sync_edge              = 1,
+		.sync_ctrl              = 1,
+		.raster_order           = 0,
+};
+
+static int tilcdc_external_mode_valid(struct drm_connector *connector,
+				      struct drm_display_mode *mode)
+{
+	struct tilcdc_drm_private *priv = connector->dev->dev_private;
+	int ret, i;
+
+	ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
+	if (ret != MODE_OK)
+		return ret;
+
+	for (i = 0; i < priv->num_connectors &&
+		     priv->connectors[i] != connector; i++)
+		;
+
+	BUG_ON(priv->connectors[i] != connector);
+	BUG_ON(!priv->connector_funcs[i]);
+
+	/* If the connector has its own mode_valid call it. */
+	if (!IS_ERR(priv->connector_funcs[i]) &&
+	    priv->connector_funcs[i]->mode_valid)
+		return priv->connector_funcs[i]->mode_valid(connector, mode);
+
+	return MODE_OK;
+}
+
+static int tilcdc_add_external_encoder(struct drm_device *dev, int *bpp,
+				       struct drm_connector *connector)
+{
+	struct tilcdc_drm_private *priv = dev->dev_private;
+	struct drm_connector_helper_funcs *connector_funcs;
+
+	priv->connectors[priv->num_connectors] = connector;
+	priv->encoders[priv->num_encoders++] = connector->encoder;
+
+	/* Only tda998x is supported at the moment. */
+	tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
+	tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
+	*bpp = panel_info_tda998x.bpp;
+
+	connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
+				       GFP_KERNEL);
+	if (!connector_funcs)
+		return -ENOMEM;
+
+	/* connector->helper_private contains always struct
+	 * connector_helper_funcs pointer. For tilcdc crtc to have a
+	 * say if a specific mode is Ok, we need to install our own
+	 * helper functions. In our helper functions we copy
+	 * everything else but use our own mode_valid() (above).
+	 */
+	if (connector->helper_private) {
+		priv->connector_funcs[priv->num_connectors] =
+			connector->helper_private;
+		*connector_funcs = *priv->connector_funcs[priv->num_connectors];
+	} else {
+		priv->connector_funcs[priv->num_connectors] = ERR_PTR(-ENOENT);
+	}
+	connector_funcs->mode_valid = tilcdc_external_mode_valid;
+	drm_connector_helper_add(connector, connector_funcs);
+	priv->num_connectors++;
+
+	dev_dbg(dev->dev, "External encoder '%s' connected\n",
+		connector->encoder->name);
+
+	return 0;
+}
+
+int tilcdc_add_external_encoders(struct drm_device *dev, int *bpp)
+{
+	struct tilcdc_drm_private *priv = dev->dev_private;
+	struct drm_connector *connector;
+	int num_internal_connectors = priv->num_connectors;
+
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+		bool found = false;
+		int i, ret;
+
+		for (i = 0; i < num_internal_connectors; i++)
+			if (connector == priv->connectors[i])
+				found = true;
+		if (!found) {
+			ret = tilcdc_add_external_encoder(dev, bpp, connector);
+			if (ret)
+				return ret;
+		}
+	}
+	return 0;
+}
+
+void tilcdc_remove_external_encoders(struct drm_device *dev)
+{
+	struct tilcdc_drm_private *priv = dev->dev_private;
+	int i;
+
+	/* Restore the original helper functions, if any. */
+	for (i = 0; i < priv->num_connectors; i++)
+		if (IS_ERR(priv->connector_funcs[i]))
+			drm_connector_helper_add(priv->connectors[i], NULL);
+		else if (priv->connector_funcs[i])
+			drm_connector_helper_add(priv->connectors[i],
+						 priv->connector_funcs[i]);
+}
+
+static int dev_match_of(struct device *dev, void *data)
+{
+	return dev->of_node == data;
+}
+
+int tilcdc_get_external_components(struct device *dev,
+				   struct component_match **match)
+{
+	struct device_node *ep = NULL;
+	int count = 0;
+
+	while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
+		struct device_node *node;
+
+		node = of_graph_get_remote_port_parent(ep);
+		if (!node && !of_device_is_available(node)) {
+			of_node_put(node);
+			continue;
+		}
+
+		dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
+		if (match)
+			component_match_add(dev, match, dev_match_of, node);
+		of_node_put(node);
+		count++;
+	}
+
+	if (count > 1) {
+		dev_err(dev, "Only one external encoder is supported\n");
+		return -EINVAL;
+	}
+
+	return count;
+}

drivers/gpu/drm/tilcdc/tilcdc_slave.h → drivers/gpu/drm/tilcdc/tilcdc_external.h

 /*
- * Copyright (C) 2012 Texas Instruments
- * Author: Rob Clark <robdclark@gmail.com>
+ * Copyright (C) 2015 Texas Instruments
+ * Author: Jyri Sarha <jsarha@ti.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
@@ -15,12 +15,11 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef __TILCDC_SLAVE_H__
-#define __TILCDC_SLAVE_H__
-
-/* sub-module for i2c slave encoder output */
-
-int tilcdc_slave_init(void);
-void tilcdc_slave_fini(void);
+#ifndef __TILCDC_EXTERNAL_H__
+#define __TILCDC_EXTERNAL_H__
 
+int tilcdc_add_external_encoders(struct drm_device *dev, int *bpp);
+void tilcdc_remove_external_encoders(struct drm_device *dev);
+int tilcdc_get_external_components(struct device *dev,
+				   struct component_match **match);
 #endif /* __TILCDC_SLAVE_H__ */

drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c

+/*
+ * Copyright (C) 2015 Texas Instruments
+ * Author: Jyri Sarha <jsarha@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ */
+
+/*
+ * To support the old "ti,tilcdc,slave" binding the binding has to be
+ * transformed to the new external encoder binding.
+ */
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/of_fdt.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+
+#include "tilcdc_slave_compat.h"
+
+struct kfree_table {
+	int total;
+	int num;
+	void **table;
+};
+
+static int __init kfree_table_init(struct kfree_table *kft)
+{
+	kft->total = 32;
+	kft->num = 0;
+	kft->table = kmalloc(kft->total * sizeof(*kft->table),
+			     GFP_KERNEL);
+	if (!kft->table)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int __init kfree_table_add(struct kfree_table *kft, void *p)
+{
+	if (kft->num == kft->total) {
+		void **old = kft->table;
+
+		kft->total *= 2;
+		kft->table = krealloc(old, kft->total * sizeof(*kft->table),
+				      GFP_KERNEL);
+		if (!kft->table) {
+			kft->table = old;
+			kfree(p);
+			return -ENOMEM;
+		}
+	}
+	kft->table[kft->num++] = p;
+	return 0;
+}
+
+static void __init kfree_table_free(struct kfree_table *kft)
+{
+	int i;
+
+	for (i = 0; i < kft->num; i++)
+		kfree(kft->table[i]);
+
+	kfree(kft->table);
+}
+
+static
+struct property * __init tilcdc_prop_dup(const struct property *prop,
+					 struct kfree_table *kft)
+{
+	struct property *nprop;
+
+	nprop = kzalloc(sizeof(*nprop), GFP_KERNEL);
+	if (!nprop || kfree_table_add(kft, nprop))
+		return NULL;
+
+	nprop->name = kstrdup(prop->name, GFP_KERNEL);
+	if (!nprop->name || kfree_table_add(kft, nprop->name))
+		return NULL;
+
+	nprop->value = kmemdup(prop->value, prop->length, GFP_KERNEL);
+	if (!nprop->value || kfree_table_add(kft, nprop->value))
+		return NULL;
+
+	nprop->length = prop->length;
+
+	return nprop;
+}
+
+static void __init tilcdc_copy_props(struct device_node *from,
+				     struct device_node *to,
+				     const char * const props[],
+				     struct kfree_table *kft)
+{
+	struct property *prop;
+	int i;
+
+	for (i = 0; props[i]; i++) {
+		prop = of_find_property(from, props[i], NULL);
+		if (!prop)
+			continue;
+
+		prop = tilcdc_prop_dup(prop, kft);
+		if (!prop)
+			continue;
+
+		prop->next = to->properties;
+		to->properties = prop;
+	}
+}
+
+static int __init tilcdc_prop_str_update(struct property *prop,
+					  const char *str,
+					  struct kfree_table *kft)
+{
+	prop->value = kstrdup(str, GFP_KERNEL);
+	if (kfree_table_add(kft, prop->value) || !prop->value)
+		return -ENOMEM;
+	prop->length = strlen(str)+1;
+	return 0;
+}
+
+static void __init tilcdc_node_disable(struct device_node *node)
+{
+	struct property *prop;
+
+	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+	if (!prop)
+		return;
+
+	prop->name = "status";
+	prop->value = "disabled";
+	prop->length = strlen((char *)prop->value)+1;
+
+	of_update_property(node, prop);
+}
+
+struct device_node * __init tilcdc_get_overlay(struct kfree_table *kft)
+{
+	const int size = __dtb_tilcdc_slave_compat_end -
+		__dtb_tilcdc_slave_compat_begin;
+	static void *overlay_data;
+	struct device_node *overlay;
+	int ret;
+
+	if (!size) {
+		pr_warn("%s: No overlay data\n", __func__);
+		return NULL;
+	}
+
+	overlay_data = kmemdup(__dtb_tilcdc_slave_compat_begin,
+			       size, GFP_KERNEL);
+	if (!overlay_data || kfree_table_add(kft, overlay_data))
+		return NULL;
+
+	of_fdt_unflatten_tree(overlay_data, &overlay);
+	if (!overlay) {
+		pr_warn("%s: Unfattening overlay tree failed\n", __func__);
+		return NULL;
+	}
+
+	of_node_set_flag(overlay, OF_DETACHED);
+	ret = of_resolve_phandles(overlay);
+	if (ret) {
+		pr_err("%s: Failed to resolve phandles: %d\n", __func__, ret);
+		return NULL;
+	}
+
+	return overlay;
+}
+
+static const struct of_device_id tilcdc_slave_of_match[] __initconst = {
+	{ .compatible = "ti,tilcdc,slave", },
+	{},
+};
+
+static const struct of_device_id tilcdc_of_match[] __initconst = {
+	{ .compatible = "ti,am33xx-tilcdc", },
+	{},
+};
+
+static const struct of_device_id tilcdc_tda998x_of_match[] __initconst = {
+	{ .compatible = "nxp,tda998x", },
+	{},
+};
+
+static const char * const tilcdc_slave_props[] __initconst = {
+	"pinctrl-names",
+	"pinctrl-0",
+	"pinctrl-1",
+	NULL
+};
+
+void __init tilcdc_convert_slave_node(void)
+{
+	struct device_node *slave = NULL, *lcdc = NULL;
+	struct device_node *i2c = NULL, *fragment = NULL;
+	struct device_node *overlay, *encoder;
+	struct property *prop;
+	/* For all memory needed for the overlay tree. This memory can
+	   be freed after the overlay has been applied. */
+	struct kfree_table kft;
+	int ret;
+
+	if (kfree_table_init(&kft))
+		goto out;
+
+	lcdc = of_find_matching_node(NULL, tilcdc_of_match);
+	slave = of_find_matching_node(NULL, tilcdc_slave_of_match);
+
+	if (!slave || !of_device_is_available(lcdc))
+		goto out;
+
+	i2c = of_parse_phandle(slave, "i2c", 0);
+	if (!i2c) {
+		pr_err("%s: Can't find i2c node trough phandle\n", __func__);
+		goto out;
+	}
+
+	overlay = tilcdc_get_overlay(&kft);
+	if (!overlay)
+		goto out;
+
+	encoder = of_find_matching_node(overlay, tilcdc_tda998x_of_match);
+	if (!encoder) {
+		pr_err("%s: Failed to find tda998x node\n", __func__);
+		goto out;
+	}
+
+	tilcdc_copy_props(slave, encoder, tilcdc_slave_props, &kft);
+
+	for_each_child_of_node(overlay, fragment) {
+		prop = of_find_property(fragment, "target-path", NULL);
+		if (!prop)
+			continue;
+		if (!strncmp("i2c", (char *)prop->value, prop->length))
+			if (tilcdc_prop_str_update(prop, i2c->full_name, &kft))
+				goto out;
+		if (!strncmp("lcdc", (char *)prop->value, prop->length))
+			if (tilcdc_prop_str_update(prop, lcdc->full_name, &kft))
+				goto out;
+	}
+
+	tilcdc_node_disable(slave);
+
+	ret = of_overlay_create(overlay);
+	if (ret)
+		pr_err("%s: Creating overlay failed: %d\n", __func__, ret);
+	else
+		pr_info("%s: ti,tilcdc,slave node successfully converted\n",
+			__func__);
+out:
+	kfree_table_free(&kft);
+	of_node_put(i2c);
+	of_node_put(slave);
+	of_node_put(lcdc);
+	of_node_put(fragment);
+}
+
+int __init tilcdc_slave_compat_init(void)
+{
+	tilcdc_convert_slave_node();
+	return 0;
+}
+
+subsys_initcall(tilcdc_slave_compat_init);

drivers/gpu/drm/tilcdc/tilcdc_slave_compat.dts

+/*
+ * DTS overlay for converting ti,tilcdc,slave binding to new binding.
+ *
+ * Copyright (C) 2015 Texas Instruments Inc.
+ * Author: Jyri Sarha <jsarha@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+/*
+ * target-path property values are simple tags that are replaced with
+ * correct values in tildcdc_slave_compat.c. Some properties are also
+ * copied over from the ti,tilcdc,slave node.
+ */
+
+/dts-v1/;
+/ {
+	fragment@0 {
+		target-path = "i2c";
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			tda19988 {
+				compatible = "nxp,tda998x";
+				reg = <0x70>;
+				status = "okay";
+
+				port {
+					hdmi_0: endpoint@0 {
+						remote-endpoint = <&lcd_0>;
+					};
+				};
+			};
+		};
+	};
+
+	fragment@1 {
+		target-path = "lcdc";
+		__overlay__ {
+			port {
+				lcd_0: endpoint@0 {
+					remote-endpoint = <&hdmi_0>;
+				};
+			};
+		};
+	};
+
+	__local_fixups__ {
+		fragment@0 {
+			__overlay__ {
+				tda19988 {
+					port {
+						endpoint@0 {
+							remote-endpoint	= <0>;
+						};
+					};
+				};
+			};
+		};
+		fragment@1 {
+			__overlay__ {
+				port {
+					endpoint@0 {
+						remote-endpoint	= <0>;
+					};
+				};
+			};
+		};
+	};
+};

drivers/gpu/drm/tilcdc/tilcdc_slave_compat.h

+/*
+ * Copyright (C) 2015 Texas Instruments
+ * Author: Jyri Sarha <jsarha@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/* This header declares the symbols defined in tilcdc_slave_compat.dts */
+
+#ifndef __TILCDC_SLAVE_COMPAT_H__
+#define __TILCDC_SLAVE_COMPAT_H__
+
+extern uint8_t __dtb_tilcdc_slave_compat_begin[];
+extern uint8_t __dtb_tilcdc_slave_compat_end[];
+
+#endif /* __TILCDC_SLAVE_COMPAT_H__ */