On Mon, Aug 18, 2025 at 07:44:44PM +0200, Marco Felsch wrote:
> This ports the Linux nvmem-layout core infrastructure required for the
> actual nvmem-layout drivers. This commit doesn't add any specific
> nvmem-layout driver.
>
> A nvmem-layout is the new way to describe the nvmem storage format. The
> nvmem-layout driver parses the nvmem sotrage format and provides the
> information via nvmem-cells.
>
> Signed-off-by: Marco Felsch <m.fel...@pengutronix.de>
> ---
> drivers/nvmem/Kconfig | 7 ++
> drivers/nvmem/Makefile | 3 +
> drivers/nvmem/core.c | 100 +++++++++++++++++++++++-
> drivers/nvmem/internals.h | 22 ++++++
> drivers/nvmem/layouts.c | 173
> +++++++++++++++++++++++++++++++++++++++++
> drivers/nvmem/layouts/Kconfig | 13 ++++
> drivers/nvmem/layouts/Makefile | 7 ++
> include/linux/nvmem-provider.h | 63 +++++++++++++++
> 8 files changed, 385 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
> +struct device_node *of_nvmem_layout_get_container(struct nvmem_device *nvmem)
> +{
> + return of_get_child_by_name(nvmem->dev.of_node, "nvmem-layout");
This also needs an additional
if (!nvmem->dev.of_node)
return NULL;
check. This also goes down to of_get_child_by_name doing a
for_each_child_of_node() which is defines as:
#define for_each_child_of_node(parent, child) \
list_for_each_entry(child, &parent->children, parent_list)
list_for_each_entry() does not work with NULL pointers. We might want to
change this for Linux compatibility.
Sascha
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