--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rcar_du_of.c - Legacy DT bindings compatibility
+ *
+ * Copyright (C) 2018 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * Based on work from Jyri Sarha <jsarha@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;
+ unsigned int i;
+ int ovcs_id;
+
+ for (i = 0; dtbs[i].compatible; ++i) {
+ if (!strcmp(dtbs[i].compatible, compatible)) {
+ dtb = &dtbs[i];
+ break;
+ }
+ }
+
+ if (!dtb)
+ return -ENODEV;
+
+ ovcs_id = 0;
+ return of_overlay_fdt_apply(dtb->begin, dtb->end - dtb->begin,
+ &ovcs_id);
+}
+
+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[22];
+ 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);
+}
projects / openwrt / staging / blogic.git / commitdiff