[openwrt/openwrt] kernel: backport mtd dynamic partition patch
LEDE Commits
lede-commits at lists.infradead.org
Wed Sep 14 00:27:18 PDT 2022
rmilecki pushed a commit to openwrt/openwrt.git, branch openwrt-22.03:
https://git.openwrt.org/cae4d089bc1d3125d8b35d6bf93c31dbe5827421
commit cae4d089bc1d3125d8b35d6bf93c31dbe5827421
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Wed Jun 29 17:34:51 2022 +0200
kernel: backport mtd dynamic partition patch
Backport upstream solution that permits to declare nvmem cells with
dynamic partition defined by special parser.
This provide an OF node for NVMEM and connect it to the defined dynamic
partition.
Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
(cherry picked from commit 1a9ee367343edce263f82cc91a49d796c9d45ea3)
---
...mtd-nor-support-mtd-name-from-device-tree.patch | 2 +-
...troduce-of-support-for-dynamic-partitions.patch | 106 +++++++++++++++++++++
...etting-MTD-device-associated-with-a-speci.patch | 2 +-
...-blktrans-call-add-disks-after-mtd-device.patch | 2 +-
.../420-mtd-set-rootfs-to-be-root-dev.patch | 2 +-
.../495-mtd-core-add-get_mtd_device_by_node.patch | 2 +-
...mtd-nor-support-mtd-name-from-device-tree.patch | 2 +-
7 files changed, 112 insertions(+), 6 deletions(-)
diff --git a/target/linux/ath79/patches-5.10/401-mtd-nor-support-mtd-name-from-device-tree.patch b/target/linux/ath79/patches-5.10/401-mtd-nor-support-mtd-name-from-device-tree.patch
index 4677821b83..285b8126f6 100644
--- a/target/linux/ath79/patches-5.10/401-mtd-nor-support-mtd-name-from-device-tree.patch
+++ b/target/linux/ath79/patches-5.10/401-mtd-nor-support-mtd-name-from-device-tree.patch
@@ -34,7 +34,7 @@ Signed-off-by: Abhimanyu Vishwakarma <Abhimanyu.Vishwakarma at imgtec.com>
mtd->type = MTD_NORFLASH;
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
-@@ -788,6 +788,17 @@ out_error:
+@@ -849,6 +849,17 @@ out_error:
*/
static void mtd_set_dev_defaults(struct mtd_info *mtd)
{
diff --git a/target/linux/generic/backport-5.10/413-v6.0-mtd-next-mtd-core-introduce-of-support-for-dynamic-partitions.patch b/target/linux/generic/backport-5.10/413-v6.0-mtd-next-mtd-core-introduce-of-support-for-dynamic-partitions.patch
new file mode 100644
index 0000000000..801d9a13cb
--- /dev/null
+++ b/target/linux/generic/backport-5.10/413-v6.0-mtd-next-mtd-core-introduce-of-support-for-dynamic-partitions.patch
@@ -0,0 +1,106 @@
+From ad9b10d1eaada169bd764abcab58f08538877e26 Mon Sep 17 00:00:00 2001
+From: Christian Marangi <ansuelsmth at gmail.com>
+Date: Wed, 22 Jun 2022 03:06:28 +0200
+Subject: mtd: core: introduce of support for dynamic partitions
+
+We have many parser that register mtd partitions at runtime. One example
+is the cmdlinepart or the smem-part parser where the compatible is defined
+in the dts and the partitions gets detected and registered by the
+parser. This is problematic for the NVMEM subsystem that requires an OF
+node to detect NVMEM cells.
+
+To fix this problem, introduce an additional logic that will try to
+assign an OF node to the MTD if declared.
+
+On MTD addition, it will be checked if the MTD has an OF node and if
+not declared will check if a partition with the same label / node name is
+declared in DTS. If an exact match is found, the partition dynamically
+allocated by the parser will have a connected OF node.
+
+The NVMEM subsystem will detect the OF node and register any NVMEM cells
+declared statically in the DTS.
+
+Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
+Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
+Link: https://lore.kernel.org/linux-mtd/20220622010628.30414-4-ansuelsmth@gmail.com
+---
+ drivers/mtd/mtdcore.c | 61 +++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 61 insertions(+)
+
+--- a/drivers/mtd/mtdcore.c
++++ b/drivers/mtd/mtdcore.c
+@@ -561,6 +561,66 @@ static int mtd_nvmem_add(struct mtd_info
+ return 0;
+ }
+
++static void mtd_check_of_node(struct mtd_info *mtd)
++{
++ struct device_node *partitions, *parent_dn, *mtd_dn = NULL;
++ const char *pname, *prefix = "partition-";
++ int plen, mtd_name_len, offset, prefix_len;
++ struct mtd_info *parent;
++ bool found = false;
++
++ /* Check if MTD already has a device node */
++ if (dev_of_node(&mtd->dev))
++ return;
++
++ /* Check if a partitions node exist */
++ parent = mtd->parent;
++ parent_dn = dev_of_node(&parent->dev);
++ if (!parent_dn)
++ return;
++
++ partitions = of_get_child_by_name(parent_dn, "partitions");
++ if (!partitions)
++ goto exit_parent;
++
++ prefix_len = strlen(prefix);
++ mtd_name_len = strlen(mtd->name);
++
++ /* Search if a partition is defined with the same name */
++ for_each_child_of_node(partitions, mtd_dn) {
++ offset = 0;
++
++ /* Skip partition with no/wrong prefix */
++ if (!of_node_name_prefix(mtd_dn, "partition-"))
++ continue;
++
++ /* Label have priority. Check that first */
++ if (of_property_read_string(mtd_dn, "label", &pname)) {
++ of_property_read_string(mtd_dn, "name", &pname);
++ offset = prefix_len;
++ }
++
++ plen = strlen(pname) - offset;
++ if (plen == mtd_name_len &&
++ !strncmp(mtd->name, pname + offset, plen)) {
++ found = true;
++ break;
++ }
++ }
++
++ if (!found)
++ goto exit_partitions;
++
++ /* Set of_node only for nvmem */
++ if (of_device_is_compatible(mtd_dn, "nvmem-cells"))
++ mtd_set_of_node(mtd, mtd_dn);
++
++exit_partitions:
++ of_node_put(partitions);
++exit_parent:
++ of_node_put(parent_dn);
++}
++
+ /**
+ * add_mtd_device - register an MTD device
+ * @mtd: pointer to new MTD device info structure
+@@ -666,6 +726,7 @@ int add_mtd_device(struct mtd_info *mtd)
+ mtd->dev.devt = MTD_DEVT(i);
+ dev_set_name(&mtd->dev, "mtd%d", i);
+ dev_set_drvdata(&mtd->dev, mtd);
++ mtd_check_of_node(mtd);
+ of_node_get(mtd_get_of_node(mtd));
+ error = device_register(&mtd->dev);
+ if (error)
diff --git a/target/linux/generic/backport-5.10/414-v6.1-mtd-allow-getting-MTD-device-associated-with-a-speci.patch b/target/linux/generic/backport-5.10/414-v6.1-mtd-allow-getting-MTD-device-associated-with-a-speci.patch
index adb8b2ddd8..0e8708e5bb 100644
--- a/target/linux/generic/backport-5.10/414-v6.1-mtd-allow-getting-MTD-device-associated-with-a-speci.patch
+++ b/target/linux/generic/backport-5.10/414-v6.1-mtd-allow-getting-MTD-device-associated-with-a-speci.patch
@@ -25,7 +25,7 @@ Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
-@@ -1009,6 +1009,34 @@ int __get_mtd_device(struct mtd_info *mt
+@@ -1070,6 +1070,34 @@ int __get_mtd_device(struct mtd_info *mt
EXPORT_SYMBOL_GPL(__get_mtd_device);
/**
diff --git a/target/linux/generic/hack-5.10/402-mtd-blktrans-call-add-disks-after-mtd-device.patch b/target/linux/generic/hack-5.10/402-mtd-blktrans-call-add-disks-after-mtd-device.patch
index a5dc72f43b..7de27fddb1 100644
--- a/target/linux/generic/hack-5.10/402-mtd-blktrans-call-add-disks-after-mtd-device.patch
+++ b/target/linux/generic/hack-5.10/402-mtd-blktrans-call-add-disks-after-mtd-device.patch
@@ -77,7 +77,7 @@ Signed-off-by: Daniel Golle <daniel at makrotopia.org>
#include "mtdcore.h"
-@@ -861,6 +862,8 @@ int mtd_device_parse_register(struct mtd
+@@ -922,6 +923,8 @@ int mtd_device_parse_register(struct mtd
register_reboot_notifier(&mtd->reboot_notifier);
}
diff --git a/target/linux/generic/hack-5.10/420-mtd-set-rootfs-to-be-root-dev.patch b/target/linux/generic/hack-5.10/420-mtd-set-rootfs-to-be-root-dev.patch
index d34306b7fc..ad68d52c72 100644
--- a/target/linux/generic/hack-5.10/420-mtd-set-rootfs-to-be-root-dev.patch
+++ b/target/linux/generic/hack-5.10/420-mtd-set-rootfs-to-be-root-dev.patch
@@ -20,7 +20,7 @@ Signed-off-by: Gabor Juhos <juhosg at openwrt.org>
#include <linux/nvmem-provider.h>
#include <linux/mtd/mtd.h>
-@@ -704,6 +705,19 @@ int add_mtd_device(struct mtd_info *mtd)
+@@ -765,6 +766,19 @@ int add_mtd_device(struct mtd_info *mtd)
of this try_ nonsense, and no bitching about it
either. :) */
__module_get(THIS_MODULE);
diff --git a/target/linux/generic/pending-5.10/495-mtd-core-add-get_mtd_device_by_node.patch b/target/linux/generic/pending-5.10/495-mtd-core-add-get_mtd_device_by_node.patch
index 367f2130c4..66017e1648 100644
--- a/target/linux/generic/pending-5.10/495-mtd-core-add-get_mtd_device_by_node.patch
+++ b/target/linux/generic/pending-5.10/495-mtd-core-add-get_mtd_device_by_node.patch
@@ -17,7 +17,7 @@ Reviewed-by: Miquel Raynal <miquel.raynal at bootlin.com>
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
-@@ -1084,6 +1084,44 @@ out_unlock:
+@@ -1145,6 +1145,44 @@ out_unlock:
}
EXPORT_SYMBOL_GPL(get_mtd_device_nm);
diff --git a/target/linux/pistachio/patches-5.10/401-mtd-nor-support-mtd-name-from-device-tree.patch b/target/linux/pistachio/patches-5.10/401-mtd-nor-support-mtd-name-from-device-tree.patch
index 4677821b83..285b8126f6 100644
--- a/target/linux/pistachio/patches-5.10/401-mtd-nor-support-mtd-name-from-device-tree.patch
+++ b/target/linux/pistachio/patches-5.10/401-mtd-nor-support-mtd-name-from-device-tree.patch
@@ -34,7 +34,7 @@ Signed-off-by: Abhimanyu Vishwakarma <Abhimanyu.Vishwakarma at imgtec.com>
mtd->type = MTD_NORFLASH;
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
-@@ -788,6 +788,17 @@ out_error:
+@@ -849,6 +849,17 @@ out_error:
*/
static void mtd_set_dev_defaults(struct mtd_info *mtd)
{
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