[PATCH v6 3/4] drm: rcar-du: Fix legacy DT to create LVDS encoder nodes
Laurent Pinchart
laurent.pinchart+renesas at ideasonboard.com
Thu Feb 22 13:13:35 UTC 2018
The internal LVDS encoders now have their own DT bindings. Before
switching the driver infrastructure to those new bindings, implement
backward-compatibility through live DT patching.
Patching is disabled and will be enabled along with support for the new
DT bindings in the DU driver.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
---
Changes since v5:
- Use a private copy of rcar_du_of_changeset_add_property()
Changes since v3:
- Use the OF changeset API
- Use of_graph_get_endpoint_by_regs()
- Replace hardcoded constants by sizeof()
Changes since v2:
- Update the SPDX headers to use C-style comments in header files
- Removed the manually created __local_fixups__ node
- Perform manual fixups on live DT instead of overlay
Changes since v1:
- Select OF_FLATTREE
- Compile LVDS DT bindings patch code when DRM_RCAR_LVDS is selected
- Update the SPDX headers to use GPL-2.0 instead of GPL-2.0-only
- Turn __dtb_rcar_du_of_lvds_(begin|end) from u8 to char
- Pass void begin and end pointers to rcar_du_of_get_overlay()
- Use of_get_parent() instead of accessing the parent pointer directly
- Find the LVDS endpoints nodes based on the LVDS node instead of the
root of the overlay
- Update to the <soc>-lvds compatible string format
---
drivers/gpu/drm/rcar-du/Kconfig | 2 +
drivers/gpu/drm/rcar-du/Makefile | 7 +-
drivers/gpu/drm/rcar-du/rcar_du_of.c | 342 +++++++++++++++++++++
drivers/gpu/drm/rcar-du/rcar_du_of.h | 20 ++
.../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dts | 79 +++++
.../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dts | 53 ++++
.../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dts | 53 ++++
.../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dts | 53 ++++
.../gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dts | 53 ++++
9 files changed, 661 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of.c
create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of.h
create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dts
create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dts
create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dts
create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dts
create mode 100644 drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dts
diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
index 5d0b4b7119af..3f83352a7313 100644
--- a/drivers/gpu/drm/rcar-du/Kconfig
+++ b/drivers/gpu/drm/rcar-du/Kconfig
@@ -22,6 +22,8 @@ config DRM_RCAR_LVDS
bool "R-Car DU LVDS Encoder Support"
depends on DRM_RCAR_DU
select DRM_PANEL
+ select OF_FLATTREE
+ select OF_OVERLAY
help
Enable support for the R-Car Display Unit embedded LVDS encoders.
diff --git a/drivers/gpu/drm/rcar-du/Makefile b/drivers/gpu/drm/rcar-du/Makefile
index 0cf5c11030e8..86b337b4be5d 100644
--- a/drivers/gpu/drm/rcar-du/Makefile
+++ b/drivers/gpu/drm/rcar-du/Makefile
@@ -8,7 +8,12 @@ rcar-du-drm-y := rcar_du_crtc.o \
rcar_du_plane.o
rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS) += rcar_du_lvdsenc.o
-
+rcar-du-drm-$(CONFIG_DRM_RCAR_LVDS) += rcar_du_of.o \
+ rcar_du_of_lvds_r8a7790.dtb.o \
+ rcar_du_of_lvds_r8a7791.dtb.o \
+ rcar_du_of_lvds_r8a7793.dtb.o \
+ rcar_du_of_lvds_r8a7795.dtb.o \
+ rcar_du_of_lvds_r8a7796.dtb.o
rcar-du-drm-$(CONFIG_DRM_RCAR_VSP) += rcar_du_vsp.o
obj-$(CONFIG_DRM_RCAR_DU) += rcar-du-drm.o
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_of.c b/drivers/gpu/drm/rcar-du/rcar_du_of.c
new file mode 100644
index 000000000000..ac442ddfed16
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_of.c
@@ -0,0 +1,342 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rcar_du_of.c - Legacy DT bindings compatibility
+ *
+ * Copyright (C) 2018 Laurent Pinchart <laurent.pinchart at ideasonboard.com>
+ *
+ * Based on work from Jyri Sarha <jsarha at ti.com>
+ * Copyright (C) 2015 Texas Instruments
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_fdt.h>
+#include <linux/of_graph.h>
+#include <linux/slab.h>
+
+#include "rcar_du_crtc.h"
+#include "rcar_du_drv.h"
+
+/* -----------------------------------------------------------------------------
+ * Generic Overlay Handling
+ */
+
+struct rcar_du_of_overlay {
+ const char *compatible;
+ void *begin;
+ void *end;
+};
+
+#define RCAR_DU_OF_DTB(type, soc) \
+ extern char __dtb_rcar_du_of_##type##_##soc##_begin[]; \
+ extern char __dtb_rcar_du_of_##type##_##soc##_end[]
+
+#define RCAR_DU_OF_OVERLAY(type, soc) \
+ { \
+ .compatible = "renesas,du-" #soc, \
+ .begin = __dtb_rcar_du_of_##type##_##soc##_begin, \
+ .end = __dtb_rcar_du_of_##type##_##soc##_end, \
+ }
+
+static int __init rcar_du_of_apply_overlay(const struct rcar_du_of_overlay *dtbs,
+ const char *compatible)
+{
+ const struct rcar_du_of_overlay *dtb = NULL;
+ struct device_node *node = NULL;
+ unsigned int i;
+ int ovcs_id;
+ void *data;
+ void *mem;
+ int ret;
+
+ for (i = 0; dtbs[i].compatible; ++i) {
+ if (!strcmp(dtbs[i].compatible, compatible)) {
+ dtb = &dtbs[i];
+ break;
+ }
+ }
+
+ if (!dtb)
+ return -ENODEV;
+
+ data = kmemdup(dtb->begin, dtb->end - dtb->begin, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ mem = of_fdt_unflatten_tree(data, NULL, &node);
+ if (!mem) {
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ ovcs_id = 0;
+ ret = of_overlay_apply(node, &ovcs_id);
+
+done:
+ of_node_put(node);
+ kfree(data);
+ kfree(mem);
+
+ return ret;
+}
+
+static int __init rcar_du_of_add_property(struct of_changeset *ocs,
+ struct device_node *np,
+ const char *name, const void *value,
+ int length)
+{
+ struct property *prop;
+ int ret = -ENOMEM;
+
+ prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+ if (!prop)
+ return -ENOMEM;
+
+ prop->name = kstrdup(name, GFP_KERNEL);
+ if (!prop->name)
+ goto out_err;
+
+ prop->value = kmemdup(value, length, GFP_KERNEL);
+ if (!prop->value)
+ goto out_err;
+
+ of_property_set_flag(prop, OF_DYNAMIC);
+
+ prop->length = length;
+
+ ret = of_changeset_add_property(ocs, np, prop);
+ if (!ret)
+ return 0;
+
+out_err:
+ kfree(prop->value);
+ kfree(prop->name);
+ kfree(prop);
+ return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * LVDS Overlays
+ */
+
+RCAR_DU_OF_DTB(lvds, r8a7790);
+RCAR_DU_OF_DTB(lvds, r8a7791);
+RCAR_DU_OF_DTB(lvds, r8a7793);
+RCAR_DU_OF_DTB(lvds, r8a7795);
+RCAR_DU_OF_DTB(lvds, r8a7796);
+
+static const struct rcar_du_of_overlay rcar_du_lvds_overlays[] __initconst = {
+ RCAR_DU_OF_OVERLAY(lvds, r8a7790),
+ RCAR_DU_OF_OVERLAY(lvds, r8a7791),
+ RCAR_DU_OF_OVERLAY(lvds, r8a7793),
+ RCAR_DU_OF_OVERLAY(lvds, r8a7795),
+ RCAR_DU_OF_OVERLAY(lvds, r8a7796),
+ { /* Sentinel */ },
+};
+
+static struct of_changeset rcar_du_lvds_changeset;
+
+static void __init rcar_du_of_lvds_patch_one(struct device_node *lvds,
+ const struct of_phandle_args *clk,
+ struct device_node *local,
+ struct device_node *remote)
+{
+ unsigned int psize;
+ unsigned int i;
+ __be32 value[4];
+ int ret;
+
+ /*
+ * Set the LVDS clocks property. This can't be performed by the overlay
+ * as the structure of the clock specifier has changed over time, and we
+ * don't know at compile time which binding version the system we will
+ * run on uses.
+ */
+ if (clk->args_count >= ARRAY_SIZE(value) - 1)
+ return;
+
+ of_changeset_init(&rcar_du_lvds_changeset);
+
+ value[0] = cpu_to_be32(clk->np->phandle);
+ for (i = 0; i < clk->args_count; ++i)
+ value[i + 1] = cpu_to_be32(clk->args[i]);
+
+ psize = (clk->args_count + 1) * 4;
+ ret = rcar_du_of_add_property(&rcar_du_lvds_changeset, lvds,
+ "clocks", value, psize);
+ if (ret < 0)
+ goto done;
+
+ /*
+ * Insert the node in the OF graph: patch the LVDS ports remote-endpoint
+ * properties to point to the endpoints of the sibling nodes in the
+ * graph. This can't be performed by the overlay: on the input side the
+ * overlay would contain a phandle for the DU LVDS output port that
+ * would clash with the system DT, and on the output side the connection
+ * is board-specific.
+ */
+ value[0] = cpu_to_be32(local->phandle);
+ value[1] = cpu_to_be32(remote->phandle);
+
+ for (i = 0; i < 2; ++i) {
+ struct device_node *endpoint;
+
+ endpoint = of_graph_get_endpoint_by_regs(lvds, i, 0);
+ if (!endpoint) {
+ ret = -EINVAL;
+ goto done;
+ }
+
+ ret = rcar_du_of_add_property(&rcar_du_lvds_changeset,
+ endpoint, "remote-endpoint",
+ &value[i], sizeof(value[i]));
+ of_node_put(endpoint);
+ if (ret < 0)
+ goto done;
+ }
+
+ ret = of_changeset_apply(&rcar_du_lvds_changeset);
+
+done:
+ if (ret < 0)
+ of_changeset_destroy(&rcar_du_lvds_changeset);
+}
+
+struct lvds_of_data {
+ struct resource res;
+ struct of_phandle_args clkspec;
+ struct device_node *local;
+ struct device_node *remote;
+};
+
+static void __init rcar_du_of_lvds_patch(const struct of_device_id *of_ids)
+{
+ const struct rcar_du_device_info *info;
+ const struct of_device_id *match;
+ struct lvds_of_data lvds_data[2] = { };
+ struct device_node *lvds_node;
+ struct device_node *soc_node;
+ struct device_node *du_node;
+ char compatible[21];
+ const char *soc_name;
+ unsigned int i;
+ int ret;
+
+ /* Get the DU node and exit if not present or disabled. */
+ du_node = of_find_matching_node_and_match(NULL, of_ids, &match);
+ if (!du_node || !of_device_is_available(du_node)) {
+ of_node_put(du_node);
+ return;
+ }
+
+ info = match->data;
+ soc_node = of_get_parent(du_node);
+
+ if (WARN_ON(info->num_lvds > ARRAY_SIZE(lvds_data)))
+ goto done;
+
+ /*
+ * Skip if the LVDS nodes already exists.
+ *
+ * The nodes are searched based on the compatible string, which we
+ * construct from the SoC name found in the DU compatible string. As a
+ * match has been found we know the compatible string matches the
+ * expected format and can thus skip some of the string manipulation
+ * normal safety checks.
+ */
+ soc_name = strchr(match->compatible, '-') + 1;
+ sprintf(compatible, "renesas,%s-lvds", soc_name);
+ lvds_node = of_find_compatible_node(NULL, NULL, compatible);
+ if (lvds_node) {
+ of_node_put(lvds_node);
+ return;
+ }
+
+ /*
+ * Parse the DU node and store the register specifier, the clock
+ * specifier and the local and remote endpoint of the LVDS link for
+ * later use.
+ */
+ for (i = 0; i < info->num_lvds; ++i) {
+ struct lvds_of_data *lvds = &lvds_data[i];
+ unsigned int port;
+ char name[7];
+ int index;
+
+ sprintf(name, "lvds.%u", i);
+ index = of_property_match_string(du_node, "clock-names", name);
+ if (index < 0)
+ continue;
+
+ ret = of_parse_phandle_with_args(du_node, "clocks",
+ "#clock-cells", index,
+ &lvds->clkspec);
+ if (ret < 0)
+ continue;
+
+ port = info->routes[RCAR_DU_OUTPUT_LVDS0 + i].port;
+
+ lvds->local = of_graph_get_endpoint_by_regs(du_node, port, 0);
+ if (!lvds->local)
+ continue;
+
+ lvds->remote = of_graph_get_remote_endpoint(lvds->local);
+ if (!lvds->remote)
+ continue;
+
+ index = of_property_match_string(du_node, "reg-names", name);
+ if (index < 0)
+ continue;
+
+ of_address_to_resource(du_node, index, &lvds->res);
+ }
+
+ /* Parse and apply the overlay. This will resolve phandles. */
+ ret = rcar_du_of_apply_overlay(rcar_du_lvds_overlays,
+ match->compatible);
+ if (ret < 0)
+ goto done;
+
+ /* Patch the newly created LVDS encoder nodes. */
+ for_each_child_of_node(soc_node, lvds_node) {
+ struct resource res;
+
+ if (!of_device_is_compatible(lvds_node, compatible))
+ continue;
+
+ /* Locate the lvds_data entry based on the resource start. */
+ ret = of_address_to_resource(lvds_node, 0, &res);
+ if (ret < 0)
+ continue;
+
+ for (i = 0; i < ARRAY_SIZE(lvds_data); ++i) {
+ if (lvds_data[i].res.start == res.start)
+ break;
+ }
+
+ if (i == ARRAY_SIZE(lvds_data))
+ continue;
+
+ /* Patch the LVDS encoder. */
+ rcar_du_of_lvds_patch_one(lvds_node, &lvds_data[i].clkspec,
+ lvds_data[i].local,
+ lvds_data[i].remote);
+ }
+
+done:
+ for (i = 0; i < info->num_lvds; ++i) {
+ of_node_put(lvds_data[i].clkspec.np);
+ of_node_put(lvds_data[i].local);
+ of_node_put(lvds_data[i].remote);
+ }
+
+ of_node_put(soc_node);
+ of_node_put(du_node);
+}
+
+void __init rcar_du_of_init(const struct of_device_id *of_ids)
+{
+ rcar_du_of_lvds_patch(of_ids);
+}
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_of.h b/drivers/gpu/drm/rcar-du/rcar_du_of.h
new file mode 100644
index 000000000000..c2e65a727e91
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_of.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * rcar_du_of.h - Legacy DT bindings compatibility
+ *
+ * Copyright (C) 2018 Laurent Pinchart <laurent.pinchart at ideasonboard.com>
+ */
+#ifndef __RCAR_DU_OF_H__
+#define __RCAR_DU_OF_H__
+
+#include <linux/init.h>
+
+struct of_device_id;
+
+#ifdef CONFIG_DRM_RCAR_LVDS
+void __init rcar_du_of_init(const struct of_device_id *of_ids);
+#else
+static inline void rcar_du_of_init(const struct of_device_id *of_ids) { }
+#endif /* CONFIG_DRM_RCAR_LVDS */
+
+#endif /* __RCAR_DU_OF_H__ */
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dts b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dts
new file mode 100644
index 000000000000..f118a6ae7782
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7790.dts
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rcar_du_of_lvds_r8a7790.dts - Legacy LVDS DT bindings conversion for R8A7790
+ *
+ * Copyright (C) 2018 Laurent Pinchart <laurent.pinchart at ideasonboard.com>
+ *
+ * Based on work from Jyri Sarha <jsarha at ti.com>
+ * Copyright (C) 2015 Texas Instruments
+ */
+
+/dts-v1/;
+/plugin/;
+/ {
+ fragment at 0 {
+ target-path = "/";
+ __overlay__ {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ lvds at feb90000 {
+ compatible = "renesas,r8a7790-lvds";
+ reg = <0 0xfeb90000 0 0x1c>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port at 0 {
+ reg = <0>;
+ lvds0_input: endpoint {
+ };
+ };
+ port at 1 {
+ reg = <1>;
+ lvds0_out: endpoint {
+ };
+ };
+ };
+ };
+
+ lvds at feb94000 {
+ compatible = "renesas,r8a7790-lvds";
+ reg = <0 0xfeb94000 0 0x1c>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port at 0 {
+ reg = <0>;
+ lvds1_input: endpoint {
+ };
+ };
+ port at 1 {
+ reg = <1>;
+ lvds1_out: endpoint {
+ };
+ };
+ };
+ };
+ };
+ };
+
+ fragment at 1 {
+ target-path = "/display at feb00000/ports";
+ __overlay__ {
+ port at 1 {
+ endpoint {
+ remote-endpoint = <&lvds0_input>;
+ };
+ };
+ port at 2 {
+ endpoint {
+ remote-endpoint = <&lvds1_input>;
+ };
+ };
+ };
+ };
+};
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dts b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dts
new file mode 100644
index 000000000000..7d865727928c
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7791.dts
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rcar_du_of_lvds_r8a7791.dts - Legacy LVDS DT bindings conversion for R8A7791
+ *
+ * Copyright (C) 2018 Laurent Pinchart <laurent.pinchart at ideasonboard.com>
+ *
+ * Based on work from Jyri Sarha <jsarha at ti.com>
+ * Copyright (C) 2015 Texas Instruments
+ */
+
+/dts-v1/;
+/plugin/;
+/ {
+ fragment at 0 {
+ target-path = "/";
+ __overlay__ {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ lvds at feb90000 {
+ compatible = "renesas,r8a7791-lvds";
+ reg = <0 0xfeb90000 0 0x1c>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port at 0 {
+ reg = <0>;
+ lvds0_input: endpoint {
+ };
+ };
+ port at 1 {
+ reg = <1>;
+ lvds0_out: endpoint {
+ };
+ };
+ };
+ };
+ };
+ };
+
+ fragment at 1 {
+ target-path = "/display at feb00000/ports";
+ __overlay__ {
+ port at 1 {
+ endpoint {
+ remote-endpoint = <&lvds0_input>;
+ };
+ };
+ };
+ };
+};
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dts b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dts
new file mode 100644
index 000000000000..bb263711834d
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7793.dts
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rcar_du_of_lvds_r8a7793.dts - Legacy LVDS DT bindings conversion for R8A7793
+ *
+ * Copyright (C) 2018 Laurent Pinchart <laurent.pinchart at ideasonboard.com>
+ *
+ * Based on work from Jyri Sarha <jsarha at ti.com>
+ * Copyright (C) 2015 Texas Instruments
+ */
+
+/dts-v1/;
+/plugin/;
+/ {
+ fragment at 0 {
+ target-path = "/";
+ __overlay__ {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ lvds at feb90000 {
+ compatible = "renesas,r8a7793-lvds";
+ reg = <0 0xfeb90000 0 0x1c>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port at 0 {
+ reg = <0>;
+ lvds0_input: endpoint {
+ };
+ };
+ port at 1 {
+ reg = <1>;
+ lvds0_out: endpoint {
+ };
+ };
+ };
+ };
+ };
+ };
+
+ fragment at 1 {
+ target-path = "/display at feb00000/ports";
+ __overlay__ {
+ port at 1 {
+ endpoint {
+ remote-endpoint = <&lvds0_input>;
+ };
+ };
+ };
+ };
+};
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dts b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dts
new file mode 100644
index 000000000000..9bbf7c9e5ce4
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7795.dts
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rcar_du_of_lvds_r8a7795.dts - Legacy LVDS DT bindings conversion for R8A7795
+ *
+ * Copyright (C) 2018 Laurent Pinchart <laurent.pinchart at ideasonboard.com>
+ *
+ * Based on work from Jyri Sarha <jsarha at ti.com>
+ * Copyright (C) 2015 Texas Instruments
+ */
+
+/dts-v1/;
+/plugin/;
+/ {
+ fragment at 0 {
+ target-path = "/soc";
+ __overlay__ {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ lvds at feb90000 {
+ compatible = "renesas,r8a7795-lvds";
+ reg = <0 0xfeb90000 0 0x14>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port at 0 {
+ reg = <0>;
+ lvds0_input: endpoint {
+ };
+ };
+ port at 1 {
+ reg = <1>;
+ lvds0_out: endpoint {
+ };
+ };
+ };
+ };
+ };
+ };
+
+ fragment at 1 {
+ target-path = "/soc/display at feb00000/ports";
+ __overlay__ {
+ port at 3 {
+ endpoint {
+ remote-endpoint = <&lvds0_input>;
+ };
+ };
+ };
+ };
+};
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dts b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dts
new file mode 100644
index 000000000000..d16f3e9e08ab
--- /dev/null
+++ b/drivers/gpu/drm/rcar-du/rcar_du_of_lvds_r8a7796.dts
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rcar_du_of_lvds_r8a7796.dts - Legacy LVDS DT bindings conversion for R8A7796
+ *
+ * Copyright (C) 2018 Laurent Pinchart <laurent.pinchart at ideasonboard.com>
+ *
+ * Based on work from Jyri Sarha <jsarha at ti.com>
+ * Copyright (C) 2015 Texas Instruments
+ */
+
+/dts-v1/;
+/plugin/;
+/ {
+ fragment at 0 {
+ target-path = "/soc";
+ __overlay__ {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ lvds at feb90000 {
+ compatible = "renesas,r8a7796-lvds";
+ reg = <0 0xfeb90000 0 0x14>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port at 0 {
+ reg = <0>;
+ lvds0_input: endpoint {
+ };
+ };
+ port at 1 {
+ reg = <1>;
+ lvds0_out: endpoint {
+ };
+ };
+ };
+ };
+ };
+ };
+
+ fragment at 1 {
+ target-path = "/soc/display at feb00000/ports";
+ __overlay__ {
+ port at 3 {
+ endpoint {
+ remote-endpoint = <&lvds0_input>;
+ };
+ };
+ };
+ };
+};
--
Regards,
Laurent Pinchart
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