--- /dev/null
+/*
+ * Copyright (C) 2014 Texas Instruments
+ * Author: Tomi Valkeinen <tomi.valkeinen@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/>.
+ */
+
+/*
+ * As omapdss panel drivers are omapdss specific, but we want to define the
+ * DT-data in generic manner, we convert the compatible strings of the panel and
+ * encoder nodes from "panel-foo" to "omapdss,panel-foo". This way we can have
+ * both correct DT data and omapdss specific drivers.
+ *
+ * When we get generic panel drivers to the kernel, this file will be removed.
+ */
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+
+static struct list_head dss_conv_list __initdata;
+
+static const char prefix[] __initconst = "omapdss,";
+
+struct dss_conv_node {
+ struct list_head list;
+ struct device_node *node;
+ bool root;
+};
+
+static int __init omapdss_count_strings(const struct property *prop)
+{
+ const char *p = prop->value;
+ int l = 0, total = 0;
+ int i;
+
+ for (i = 0; total < prop->length; total += l, p += l, i++)
+ l = strlen(p) + 1;
+
+ return i;
+}
+
+static void __init omapdss_update_prop(struct device_node *node, char *compat,
+ int len)
+{
+ struct property *prop;
+
+ prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+ if (!prop)
+ return;
+
+ prop->name = "compatible";
+ prop->value = compat;
+ prop->length = len;
+
+ of_update_property(node, prop);
+}
+
+static void __init omapdss_prefix_strcpy(char *dst, int dst_len,
+ const char *src, int src_len)
+{
+ size_t total = 0;
+
+ while (total < src_len) {
+ size_t l = strlen(src) + 1;
+
+ strcpy(dst, prefix);
+ dst += strlen(prefix);
+
+ strcpy(dst, src);
+ dst += l;
+
+ src += l;
+ total += l;
+ }
+}
+
+/* prepend compatible property strings with "omapdss," */
+static void __init omapdss_omapify_node(struct device_node *node)
+{
+ struct property *prop;
+ char *new_compat;
+ int num_strs;
+ int new_len;
+
+ prop = of_find_property(node, "compatible", NULL);
+
+ if (!prop || !prop->value)
+ return;
+
+ if (strnlen(prop->value, prop->length) >= prop->length)
+ return;
+
+ /* is it already prefixed? */
+ if (strncmp(prefix, prop->value, strlen(prefix)) == 0)
+ return;
+
+ num_strs = omapdss_count_strings(prop);
+
+ new_len = prop->length + strlen(prefix) * num_strs;
+ new_compat = kmalloc(new_len, GFP_KERNEL);
+
+ omapdss_prefix_strcpy(new_compat, new_len, prop->value, prop->length);
+
+ omapdss_update_prop(node, new_compat, new_len);
+}
+
+static void __init omapdss_add_to_list(struct device_node *node, bool root)
+{
+ struct dss_conv_node *n = kmalloc(sizeof(struct dss_conv_node),
+ GFP_KERNEL);
+ if (n) {
+ n->node = node;
+ n->root = root;
+ list_add(&n->list, &dss_conv_list);
+ }
+}
+
+static bool __init omapdss_list_contains(const struct device_node *node)
+{
+ struct dss_conv_node *n;
+
+ list_for_each_entry(n, &dss_conv_list, list) {
+ if (n->node == node)
+ return true;
+ }
+
+ return false;
+}
+
+static void __init omapdss_walk_device(struct device_node *node, bool root)
+{
+ struct device_node *n;
+
+ omapdss_add_to_list(node, root);
+
+ /*
+ * of_graph_get_remote_port_parent() prints an error if there is no
+ * port/ports node. To avoid that, check first that there's the node.
+ */
+ n = of_get_child_by_name(node, "ports");
+ if (!n)
+ n = of_get_child_by_name(node, "port");
+ if (!n)
+ return;
+
+ of_node_put(n);
+
+ n = NULL;
+ while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
+ struct device_node *pn;
+
+ pn = of_graph_get_remote_port_parent(n);
+
+ if (!pn)
+ continue;
+
+ if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
+ of_node_put(pn);
+ continue;
+ }
+
+ omapdss_walk_device(pn, false);
+ }
+}
+
+static const struct of_device_id omapdss_of_match[] __initconst = {
+ { .compatible = "ti,omap2-dss", },
+ { .compatible = "ti,omap3-dss", },
+ { .compatible = "ti,omap4-dss", },
+ { .compatible = "ti,omap5-dss", },
+ { .compatible = "ti,dra7-dss", },
+ {},
+};
+
+static int __init omapdss_boot_init(void)
+{
+ struct device_node *dss, *child;
+
+ INIT_LIST_HEAD(&dss_conv_list);
+
+ dss = of_find_matching_node(NULL, omapdss_of_match);
+
+ if (dss == NULL || !of_device_is_available(dss))
+ return 0;
+
+ omapdss_walk_device(dss, true);
+
+ for_each_available_child_of_node(dss, child) {
+ if (!of_find_property(child, "compatible", NULL)) {
+ of_node_put(child);
+ continue;
+ }
+
+ omapdss_walk_device(child, true);
+ }
+
+ while (!list_empty(&dss_conv_list)) {
+ struct dss_conv_node *n;
+
+ n = list_first_entry(&dss_conv_list, struct dss_conv_node,
+ list);
+
+ if (!n->root)
+ omapdss_omapify_node(n->node);
+
+ list_del(&n->list);
+ of_node_put(n->node);
+ kfree(n);
+ }
+
+ return 0;
+}
+
+subsys_initcall(omapdss_boot_init);
Code Review / kvmfornfv.git / blobdiff