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misc: Add fixed-layout support

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The "fixed-layout" nvmem controller subnode used to be optional wrapper
around nvmem controller cells subnodes. The "fixed-layout" node is now
mandatory in most cases, but in order to support both recent and legacy
DTs, both variants have to be supported.

Implement support for the "fixed-layout" node in the most trivial manner,
check whether the nvmem cell supernode is compatible with "fixed-layout"
and if it is, proceed one level above it to find the nvmem controller.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
This commit is contained in:
Marek Vasut
2026-01-03 01:17:31 +01:00
committed by Tom Rini
parent 0b97991fa0
commit 6014f87b03
1 changed files with 6 additions and 1 deletions
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7
drivers/misc/nvmem.c
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@@ -102,6 +102,7 @@ int nvmem_cell_get_by_index(struct udevice *dev, int index,
fdt_size_t size = FDT_SIZE_T_NONE;
int ret;
struct ofnode_phandle_args args;
ofnode par;
dev_dbg(dev, "%s: index=%d\n", __func__, index);
@@ -110,7 +111,11 @@ int nvmem_cell_get_by_index(struct udevice *dev, int index,
if (ret)
return ret;
ret = nvmem_get_device(ofnode_get_parent(args.node), cell);
par = ofnode_get_parent(args.node);
if (ofnode_device_is_compatible(par, "fixed-layout"))
par = ofnode_get_parent(par);
ret = nvmem_get_device(par, cell);
if (ret)
return ret;