drm/tilcdc: Add DRM_TILCDC_SLAVE_COMPAT for ti,tilcdc,slave binding support
Adds a CONFIG_DRM_TILCDC_SLAVE_COMPAT module for "ti,tilcdc,slave" node conversion. The implementation is in tilcdc_slave_compat.c and it uses tilcdc_slave_compat.dts as a basis for creating a DTS overlay. The DTS overlay adds an external tda998x encoder to tilcdc that corresponds to the old tda998x based slave encoder. Signed-off-by: Jyri Sarha <jsarha@ti.com> Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Jyri Sarha
parent
e3487e07b8
commit
4e72215802
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@ -12,3 +12,15 @@ config DRM_TILCDC
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Choose this option if you have an TI SoC with LCDC display
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controller, for example AM33xx in beagle-bone, DA8xx, or
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OMAP-L1xx. This driver replaces the FB_DA8XX fbdev driver.
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config DRM_TILCDC_SLAVE_COMPAT
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bool "Support device tree blobs using TI LCDC Slave binding"
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depends on DRM_TILCDC
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default y
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select OF_RESOLVE
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select OF_OVERLAY
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help
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Choose this option if you need a kernel that is compatible
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with device tree blobs using the obsolete "ti,tilcdc,slave"
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binding. If you find "ti,tilcdc,slave"-string from your DTB,
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you probably need this. Otherwise you do not.
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@ -3,6 +3,9 @@ ifeq (, $(findstring -W,$(EXTRA_CFLAGS)))
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ccflags-y += -Werror
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endif
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obj-$(CONFIG_DRM_TILCDC_SLAVE_COMPAT) += tilcdc_slave_compat.o \
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tilcdc_slave_compat.dtb.o
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tilcdc-y := \
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tilcdc_crtc.o \
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tilcdc_tfp410.o \
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@ -0,0 +1,270 @@
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/*
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* Copyright (C) 2015 Texas Instruments
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* Author: Jyri Sarha <jsarha@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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*/
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/*
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* To support the old "ti,tilcdc,slave" binding the binding has to be
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* transformed to the new external encoder binding.
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*/
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_graph.h>
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#include <linux/of_fdt.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include "tilcdc_slave_compat.h"
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struct kfree_table {
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int total;
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int num;
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void **table;
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};
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static int __init kfree_table_init(struct kfree_table *kft)
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{
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kft->total = 32;
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kft->num = 0;
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kft->table = kmalloc(kft->total * sizeof(*kft->table),
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GFP_KERNEL);
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if (!kft->table)
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return -ENOMEM;
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return 0;
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}
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static int __init kfree_table_add(struct kfree_table *kft, void *p)
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{
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if (kft->num == kft->total) {
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void **old = kft->table;
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kft->total *= 2;
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kft->table = krealloc(old, kft->total * sizeof(*kft->table),
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GFP_KERNEL);
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if (!kft->table) {
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kft->table = old;
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kfree(p);
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return -ENOMEM;
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}
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}
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kft->table[kft->num++] = p;
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return 0;
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}
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static void __init kfree_table_free(struct kfree_table *kft)
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{
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int i;
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for (i = 0; i < kft->num; i++)
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kfree(kft->table[i]);
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kfree(kft->table);
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}
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static
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struct property * __init tilcdc_prop_dup(const struct property *prop,
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struct kfree_table *kft)
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{
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struct property *nprop;
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nprop = kzalloc(sizeof(*nprop), GFP_KERNEL);
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if (!nprop || kfree_table_add(kft, nprop))
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return NULL;
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nprop->name = kstrdup(prop->name, GFP_KERNEL);
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if (!nprop->name || kfree_table_add(kft, nprop->name))
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return NULL;
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nprop->value = kmemdup(prop->value, prop->length, GFP_KERNEL);
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if (!nprop->value || kfree_table_add(kft, nprop->value))
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return NULL;
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nprop->length = prop->length;
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return nprop;
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}
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static void __init tilcdc_copy_props(struct device_node *from,
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struct device_node *to,
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const char * const props[],
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struct kfree_table *kft)
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{
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struct property *prop;
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int i;
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for (i = 0; props[i]; i++) {
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prop = of_find_property(from, props[i], NULL);
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if (!prop)
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continue;
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prop = tilcdc_prop_dup(prop, kft);
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if (!prop)
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continue;
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prop->next = to->properties;
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to->properties = prop;
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}
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}
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static int __init tilcdc_prop_str_update(struct property *prop,
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const char *str,
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struct kfree_table *kft)
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{
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prop->value = kstrdup(str, GFP_KERNEL);
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if (kfree_table_add(kft, prop->value) || !prop->value)
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return -ENOMEM;
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prop->length = strlen(str)+1;
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return 0;
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}
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static void __init tilcdc_node_disable(struct device_node *node)
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{
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struct property *prop;
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prop = kzalloc(sizeof(*prop), GFP_KERNEL);
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if (!prop)
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return;
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prop->name = "status";
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prop->value = "disabled";
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prop->length = strlen((char *)prop->value)+1;
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of_update_property(node, prop);
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}
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struct device_node * __init tilcdc_get_overlay(struct kfree_table *kft)
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{
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const int size = __dtb_tilcdc_slave_compat_end -
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__dtb_tilcdc_slave_compat_begin;
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static void *overlay_data;
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struct device_node *overlay;
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int ret;
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if (!size) {
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pr_warn("%s: No overlay data\n", __func__);
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return NULL;
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}
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overlay_data = kmemdup(__dtb_tilcdc_slave_compat_begin,
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size, GFP_KERNEL);
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if (!overlay_data || kfree_table_add(kft, overlay_data))
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return NULL;
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of_fdt_unflatten_tree(overlay_data, &overlay);
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if (!overlay) {
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pr_warn("%s: Unfattening overlay tree failed\n", __func__);
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return NULL;
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}
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of_node_set_flag(overlay, OF_DETACHED);
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ret = of_resolve_phandles(overlay);
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if (ret) {
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pr_err("%s: Failed to resolve phandles: %d\n", __func__, ret);
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return NULL;
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}
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return overlay;
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}
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static const struct of_device_id tilcdc_slave_of_match[] __initconst = {
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{ .compatible = "ti,tilcdc,slave", },
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{},
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};
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static const struct of_device_id tilcdc_of_match[] __initconst = {
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{ .compatible = "ti,am33xx-tilcdc", },
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{},
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};
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static const struct of_device_id tilcdc_tda998x_of_match[] __initconst = {
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{ .compatible = "nxp,tda998x", },
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{},
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};
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static const char * const tilcdc_slave_props[] __initconst = {
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"pinctrl-names",
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"pinctrl-0",
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"pinctrl-1",
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NULL
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};
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void __init tilcdc_convert_slave_node(void)
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{
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struct device_node *slave = NULL, *lcdc = NULL;
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struct device_node *i2c = NULL, *fragment = NULL;
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struct device_node *overlay, *encoder;
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struct property *prop;
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/* For all memory needed for the overlay tree. This memory can
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be freed after the overlay has been applied. */
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struct kfree_table kft;
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int ret;
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if (kfree_table_init(&kft))
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goto out;
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lcdc = of_find_matching_node(NULL, tilcdc_of_match);
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slave = of_find_matching_node(NULL, tilcdc_slave_of_match);
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if (!slave || !of_device_is_available(lcdc))
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goto out;
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i2c = of_parse_phandle(slave, "i2c", 0);
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if (!i2c) {
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pr_err("%s: Can't find i2c node trough phandle\n", __func__);
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goto out;
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}
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overlay = tilcdc_get_overlay(&kft);
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if (!overlay)
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goto out;
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encoder = of_find_matching_node(overlay, tilcdc_tda998x_of_match);
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if (!encoder) {
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pr_err("%s: Failed to find tda998x node\n", __func__);
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goto out;
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}
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tilcdc_copy_props(slave, encoder, tilcdc_slave_props, &kft);
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for_each_child_of_node(overlay, fragment) {
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prop = of_find_property(fragment, "target-path", NULL);
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if (!prop)
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continue;
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if (!strncmp("i2c", (char *)prop->value, prop->length))
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if (tilcdc_prop_str_update(prop, i2c->full_name, &kft))
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goto out;
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if (!strncmp("lcdc", (char *)prop->value, prop->length))
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if (tilcdc_prop_str_update(prop, lcdc->full_name, &kft))
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goto out;
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}
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tilcdc_node_disable(slave);
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ret = of_overlay_create(overlay);
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if (ret)
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pr_err("%s: Creating overlay failed: %d\n", __func__, ret);
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else
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pr_info("%s: ti,tilcdc,slave node successfully converted\n",
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__func__);
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out:
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kfree_table_free(&kft);
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of_node_put(i2c);
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of_node_put(slave);
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of_node_put(lcdc);
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of_node_put(fragment);
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}
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int __init tilcdc_slave_compat_init(void)
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{
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tilcdc_convert_slave_node();
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return 0;
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}
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subsys_initcall(tilcdc_slave_compat_init);
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@ -0,0 +1,72 @@
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/*
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* DTS overlay for converting ti,tilcdc,slave binding to new binding.
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*
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* Copyright (C) 2015 Texas Instruments Inc.
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* Author: Jyri Sarha <jsarha@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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/*
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* target-path property values are simple tags that are replaced with
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* correct values in tildcdc_slave_compat.c. Some properties are also
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* copied over from the ti,tilcdc,slave node.
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*/
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/dts-v1/;
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/ {
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fragment@0 {
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target-path = "i2c";
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__overlay__ {
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#address-cells = <1>;
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#size-cells = <0>;
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tda19988 {
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compatible = "nxp,tda998x";
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reg = <0x70>;
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status = "okay";
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port {
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hdmi_0: endpoint@0 {
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remote-endpoint = <&lcd_0>;
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};
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};
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};
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};
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};
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fragment@1 {
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target-path = "lcdc";
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__overlay__ {
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port {
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lcd_0: endpoint@0 {
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remote-endpoint = <&hdmi_0>;
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};
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};
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};
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};
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__local_fixups__ {
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fragment@0 {
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__overlay__ {
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tda19988 {
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port {
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endpoint@0 {
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remote-endpoint = <0>;
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};
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};
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};
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};
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};
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fragment@1 {
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__overlay__ {
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port {
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endpoint@0 {
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remote-endpoint = <0>;
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};
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};
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};
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};
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};
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};
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@ -0,0 +1,25 @@
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/*
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* Copyright (C) 2015 Texas Instruments
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* Author: Jyri Sarha <jsarha@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* This header declares the symbols defined in tilcdc_slave_compat.dts */
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#ifndef __TILCDC_SLAVE_COMPAT_H__
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#define __TILCDC_SLAVE_COMPAT_H__
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extern uint8_t __dtb_tilcdc_slave_compat_begin[];
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extern uint8_t __dtb_tilcdc_slave_compat_end[];
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#endif /* __TILCDC_SLAVE_COMPAT_H__ */
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