Miquel, what do you think about Rob's suggestion below?

On Mon, Mar 03, 2025 at 08:00:21AM -0600, Rob Herring wrote:

On Wed, Feb 26, 2025 at 12:45:17PM -0600, Rob Herring (Arm) wrote:

quoted

On Wed, 26 Feb 2025 18:01:41 +0100, J. Neuschäfer wrote:

quoted

Formalize the binding already supported by the fsl_elbc_nand.c driver
and used in several device trees in arch/powerpc/boot/dts/.

raw-nand-chip.yaml is referenced in order to accommodate situations in
which the ECC parameters settings are set in the device tree. One such
example is in arch/powerpc/boot/dts/turris1x.dts:

	/* MT29F2G08ABAEAWP:E NAND */
	nand@1,0 {
		compatible = "fsl,p2020-fcm-nand", "fsl,elbc-fcm-nand";
		reg = <0x1 0x0 0x00040000>;
		nand-ecc-mode = "soft";
		nand-ecc-algo = "bch";

		partitions { ... };
	};

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: J. Neuschäfer <redacted>
---

V3:
- remove unnecessary #address/size-cells from nand node in example
- add Frank Li's review tag
- add missing end of document marker (...)
- explain choice to reference raw-nand-chip.yaml

V2:
- split out from fsl,elbc binding patch
- constrain #address-cells and #size-cells
- add a general description
- use unevaluatedProperties=false instead of additionalProperties=false
- fix property order to comply with dts coding style
- include raw-nand-chip.yaml instead of nand-chip.yaml
---
 .../devicetree/bindings/mtd/fsl,elbc-fcm-nand.yaml | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/mtd/fsl,elbc-fcm-nand.example.dtb: nand@1,0: $nodename:0: 'nand@1,0' does not match '^nand@[a-f0-9]$'
	from schema $id: http://devicetree.org/schemas/mtd/fsl,elbc-fcm-nand.yaml#

Drop the unit address in raw-nand-chip.yaml. So: 

properties:
  $nodename:
    pattern: "^nand@"

^^^



Best Regards,
J. Neuschäfer