mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-03-09 15:40:20 +00:00
48 lines
1.7 KiB
Diff
48 lines
1.7 KiB
Diff
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
|
|
Date: Tue, 31 Oct 2023 15:51:01 +0100
|
|
Subject: [PATCH] mtd: don't register NVMEM devices for partitions with custom
|
|
drivers
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
This fixes issue exposed by upstream commit f4cf4e5db331 ("Revert
|
|
"nvmem: add new config option"").
|
|
|
|
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
|
|
---
|
|
drivers/mtd/mtdcore.c | 23 +++++++++++++++++++++++
|
|
1 file changed, 23 insertions(+)
|
|
|
|
--- a/drivers/mtd/mtdcore.c
|
|
+++ b/drivers/mtd/mtdcore.c
|
|
@@ -548,6 +548,29 @@ static int mtd_nvmem_add(struct mtd_info
|
|
struct device_node *node = mtd_get_of_node(mtd);
|
|
struct nvmem_config config = {};
|
|
|
|
+ /*
|
|
+ * Do NOT register NVMEM device for any partition that is meant to be
|
|
+ * handled by a U-Boot env driver. That would result in associating two
|
|
+ * different NVMEM devices with the same OF node.
|
|
+ *
|
|
+ * An example of unwanted behaviour of above (forwardtrace):
|
|
+ * of_get_mac_addr_nvmem()
|
|
+ * of_nvmem_cell_get()
|
|
+ * __nvmem_device_get()
|
|
+ *
|
|
+ * We can't have __nvmem_device_get() return "mtdX" NVMEM device instead
|
|
+ * of U-Boot env NVMEM device. That would result in failing to find
|
|
+ * NVMEM cell.
|
|
+ *
|
|
+ * This issue seems to affect U-Boot env case only and will go away with
|
|
+ * switch to NVMEM layouts.
|
|
+ */
|
|
+ if (of_device_is_compatible(node, "u-boot,env") ||
|
|
+ of_device_is_compatible(node, "u-boot,env-redundant-bool") ||
|
|
+ of_device_is_compatible(node, "u-boot,env-redundant-count") ||
|
|
+ of_device_is_compatible(node, "brcm,env"))
|
|
+ return 0;
|
|
+
|
|
config.id = NVMEM_DEVID_NONE;
|
|
config.dev = &mtd->dev;
|
|
config.name = dev_name(&mtd->dev);
|