kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 216 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.4/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch b/target/linux/generic/pending-5.4/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch
new file mode 100644
index 0000000000..6584e22882
--- /dev/null
+++ b/target/linux/generic/pending-5.4/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch
@@ -0,0 +1,216 @@
+From e53f712d8eac71f54399b61038ccf87d2cee99d7 Mon Sep 17 00:00:00 2001
+From: Bernhard Frauendienst <kernel@nospam.obeliks.de>
+Date: Sat, 25 Aug 2018 12:35:22 +0200
+Subject: [PATCH 497/497] mtd: mtdconcat: add dt driver for concat devices
+
+Some mtd drivers like physmap variants have support for concatenating
+multiple mtd devices, but there is no generic way to define such a
+concat device from within the device tree.
+
+This is useful for some SoC boards that use multiple flash chips as
+memory banks of a single mtd device, with partitions spanning chip
+borders.
+
+This commit adds a driver for creating virtual mtd-concat devices. They
+must have a compatible = "mtd-concat" line, and define a list of devices
+to concat in the 'devices' property, for example:
+
+flash {
+  compatible = "mtd-concat";
+
+  devices = <&flash0 &flash1>;
+
+  partitions {
+    ...
+  };
+};
+
+The driver is added to the very end of the mtd Makefile to increase the
+likelyhood of all child devices already being loaded at the time of
+probing, preventing unnecessary deferred probes.
+
+Signed-off-by: Bernhard Frauendienst <kernel@nospam.obeliks.de>
+---
+ drivers/mtd/Kconfig                 |   2 +
+ drivers/mtd/Makefile                |   3 +
+ drivers/mtd/composite/Kconfig       |  12 +++
+ drivers/mtd/composite/Makefile      |   6 ++
+ drivers/mtd/composite/virt_concat.c | 128 ++++++++++++++++++++++++++++
+ 5 files changed, 151 insertions(+)
+ create mode 100644 drivers/mtd/composite/Kconfig
+ create mode 100644 drivers/mtd/composite/Makefile
+ create mode 100644 drivers/mtd/composite/virt_concat.c
+
+--- a/drivers/mtd/Kconfig
++++ b/drivers/mtd/Kconfig
+@@ -374,4 +374,6 @@ source "drivers/mtd/spi-nor/Kconfig"
+ 
+ source "drivers/mtd/ubi/Kconfig"
+ 
++source "drivers/mtd/composite/Kconfig"
++
+ endif # MTD
+--- a/drivers/mtd/Makefile
++++ b/drivers/mtd/Makefile
+@@ -39,3 +39,6 @@ obj-y		+= chips/ lpddr/ maps/ devices/ n
+ 
+ obj-$(CONFIG_MTD_SPI_NOR)	+= spi-nor/
+ obj-$(CONFIG_MTD_UBI)		+= ubi/
++
++# Composite drivers must be loaded last
++obj-y		+= composite/
+--- /dev/null
++++ b/drivers/mtd/composite/Kconfig
+@@ -0,0 +1,12 @@
++menu "Composite MTD device drivers"
++	depends on MTD!=n
++
++config MTD_VIRT_CONCAT
++	tristate "Virtual concat MTD device"
++	help
++	  This driver allows creation of a virtual MTD concat device, which
++	  concatenates multiple underlying MTD devices to a single device.
++	  This is required by some SoC boards where multiple memory banks are
++	  used as one device with partitions spanning across device boundaries.
++
++endmenu
+--- /dev/null
++++ b/drivers/mtd/composite/Makefile
+@@ -0,0 +1,6 @@
++# SPDX-License-Identifier: GPL-2.0
++#
++# linux/drivers/mtd/composite/Makefile
++#
++
++obj-$(CONFIG_MTD_VIRT_CONCAT)   += virt_concat.o
+--- /dev/null
++++ b/drivers/mtd/composite/virt_concat.c
+@@ -0,0 +1,128 @@
++// SPDX-License-Identifier: GPL-2.0+
++/*
++ * Virtual concat MTD device driver
++ *
++ * Copyright (C) 2018 Bernhard Frauendienst
++ * Author: Bernhard Frauendienst, kernel@nospam.obeliks.de
++ */
++
++#include <linux/module.h>
++#include <linux/device.h>
++#include <linux/mtd/concat.h>
++#include <linux/mtd/mtd.h>
++#include <linux/mtd/partitions.h>
++#include <linux/of.h>
++#include <linux/of_platform.h>
++#include <linux/slab.h>
++
++/*
++ * struct of_virt_concat - platform device driver data.
++ * @cmtd the final mtd_concat device
++ * @num_devices the number of devices in @devices
++ * @devices points to an array of devices already loaded
++ */
++struct of_virt_concat {
++	struct mtd_info	*cmtd;
++	int num_devices;
++	struct mtd_info	**devices;
++};
++
++static int virt_concat_remove(struct platform_device *pdev)
++{
++	struct of_virt_concat *info;
++	int i;
++
++	info = platform_get_drvdata(pdev);
++	if (!info)
++		return 0;
++
++	// unset data for when this is called after a probe error
++	platform_set_drvdata(pdev, NULL);
++
++	if (info->cmtd) {
++		mtd_device_unregister(info->cmtd);
++		mtd_concat_destroy(info->cmtd);
++	}
++
++	if (info->devices) {
++		for (i = 0; i < info->num_devices; i++)
++			put_mtd_device(info->devices[i]);
++	}
++
++	return 0;
++}
++
++static int virt_concat_probe(struct platform_device *pdev)
++{
++	struct device_node *node = pdev->dev.of_node;
++	struct of_phandle_iterator it;
++	struct of_virt_concat *info;
++	struct mtd_info *mtd;
++	int err = 0, count;
++
++	count = of_count_phandle_with_args(node, "devices", NULL);
++	if (count <= 0)
++		return -EINVAL;
++
++	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
++	if (!info)
++		return -ENOMEM;
++	info->devices = devm_kcalloc(&pdev->dev, count,
++				     sizeof(*(info->devices)), GFP_KERNEL);
++	if (!info->devices) {
++		err = -ENOMEM;
++		goto err_remove;
++	}
++
++	platform_set_drvdata(pdev, info);
++
++	of_for_each_phandle(&it, err, node, "devices", NULL, 0) {
++		mtd = get_mtd_device_by_node(it.node);
++		if (IS_ERR(mtd)) {
++			of_node_put(it.node);
++			err = -EPROBE_DEFER;
++			goto err_remove;
++		}
++
++		info->devices[info->num_devices++] = mtd;
++	}
++
++	info->cmtd = mtd_concat_create(info->devices, info->num_devices,
++				       dev_name(&pdev->dev));
++	if (!info->cmtd) {
++		err = -ENXIO;
++		goto err_remove;
++	}
++
++	info->cmtd->dev.parent = &pdev->dev;
++	mtd_set_of_node(info->cmtd, node);
++	mtd_device_register(info->cmtd, NULL, 0);
++
++	return 0;
++
++err_remove:
++	virt_concat_remove(pdev);
++
++	return err;
++}
++
++static const struct of_device_id virt_concat_of_match[] = {
++	{ .compatible = "mtd-concat", },
++	{ /* sentinel */ }
++};
++MODULE_DEVICE_TABLE(of, virt_concat_of_match);
++
++static struct platform_driver virt_concat_driver = {
++	.probe = virt_concat_probe,
++	.remove = virt_concat_remove,
++	.driver	 = {
++		.name   = "virt-mtdconcat",
++		.of_match_table = virt_concat_of_match,
++	},
++};
++
++module_platform_driver(virt_concat_driver);
++
++MODULE_LICENSE("GPL v2");
++MODULE_AUTHOR("Bernhard Frauendienst <kernel@nospam.obeliks.de>");
++MODULE_DESCRIPTION("Virtual concat MTD device driver");