diff options
Diffstat (limited to 'target/linux/generic/pending-5.10/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch')
-rw-r--r-- | target/linux/generic/pending-5.10/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/target/linux/generic/pending-5.10/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch b/target/linux/generic/pending-5.10/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch deleted file mode 100644 index 9b938a43f8..0000000000 --- a/target/linux/generic/pending-5.10/497-mtd-mtdconcat-add-dt-driver-for-concat-devices.patch +++ /dev/null @@ -1,216 +0,0 @@ -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 -@@ -238,4 +238,6 @@ source "drivers/mtd/ubi/Kconfig" - - source "drivers/mtd/hyperbus/Kconfig" - -+source "drivers/mtd/composite/Kconfig" -+ - endif # MTD ---- a/drivers/mtd/Makefile -+++ b/drivers/mtd/Makefile -@@ -33,3 +33,6 @@ obj-y += chips/ lpddr/ maps/ devices/ n - obj-$(CONFIG_MTD_SPI_NOR) += spi-nor/ - obj-$(CONFIG_MTD_UBI) += ubi/ - obj-$(CONFIG_MTD_HYPERBUS) += hyperbus/ -+ -+# Composite drivers must be loaded last -+obj-y += composite/ ---- /dev/null -+++ b/drivers/mtd/composite/Kconfig -@@ -0,0 +1,12 @@ -+menu "Composite MTD device drivers" -+ depends on MTD!=n -+ -+config MTD_VIRT_CONCAT -+ tristate "Virtual concat MTD device" -+ help -+ This driver allows creation of a virtual MTD concat device, which -+ concatenates multiple underlying MTD devices to a single device. -+ This is required by some SoC boards where multiple memory banks are -+ used as one device with partitions spanning across device boundaries. -+ -+endmenu ---- /dev/null -+++ b/drivers/mtd/composite/Makefile -@@ -0,0 +1,6 @@ -+# SPDX-License-Identifier: GPL-2.0 -+# -+# linux/drivers/mtd/composite/Makefile -+# -+ -+obj-$(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 = of_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"); |