drm/tilcdc: Add DRM_TILCDC_SLAVE_COMPAT for ti,tilcdc,slave binding support (4e722158) · Commits · e / devices / android_kernel_teracube_2e

drivers/gpu/drm/tilcdc/Kconfig

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		@@ -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

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		@@ -3,6 +3,9 @@ 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 \

drivers/gpu/drm/tilcdc/tilcdc_slave_compat.c

0 → 100644

+270 −0

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		/*
		* 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

0 → 100644

+72 −0

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		/*
		* 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

0 → 100644

+25 −0

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		/*
		* 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__ */