From: Keguang Zhang <keguang.zhang@gmail.com>

Add devicetree binding document for Loongson-1 NAND controller.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
---
Changes in v10:
- None

Changes in v9:
- Change the compatible to 'loongson,ls1*-nand-controller'.
- Rename the file to loongson,ls1b-nand-controller.yaml
- Some minor adjustments.

Changes in v8:
- Add a description part.
- Adjust the compatible because the match data for ls1c-nfc differs from ls1b-nfc.
- Mark 'nand-use-soft-ecc-engine' and 'nand-ecc-algo' as mandatory.
- Delete the superfluous blank lines.

Changes in v7:
- rename the file to loongson,ls1b-nfc.yaml

Changes in v6:
- A newly added patch
---
 .../mtd/loongson,ls1b-nand-controller.yaml         | 75 ++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/loongson,ls1b-nand-controller.yaml b/Documentation/devicetree/bindings/mtd/loongson,ls1b-nand-controller.yaml
new file mode 100644
index 000000000000..308baf23221b
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/loongson,ls1b-nand-controller.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/loongson,ls1b-nand-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson-1 NAND Controller
+
+maintainers:
+  - Keguang Zhang <keguang.zhang@gmail.com>
+
+description:
+  The Loongson-1 NAND controller abstracts all supported operations,
+  meaning it does not support low-level access to raw NAND flash chips.
+  Moreover, the controller is paired with the DMA engine to perform
+  READ and PROGRAM functions.
+
+allOf:
+  - $ref: nand-controller.yaml
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - loongson,ls1b-nand-controller
+          - loongson,ls1c-nand-controller
+      - items:
+          - enum:
+              - loongson,ls1a-nand-controller
+          - const: loongson,ls1b-nand-controller
+
+  reg:
+    maxItems: 1
+
+  dmas:
+    maxItems: 1
+
+  dma-names:
+    const: rxtx
+
+patternProperties:
+  "^nand@[0-3]$":
+    type: object
+    $ref: raw-nand-chip.yaml
+
+    required:
+      - nand-use-soft-ecc-engine
+      - nand-ecc-algo
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - dmas
+  - dma-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    nand-controller@1fe78000 {
+        compatible = "loongson,ls1b-nand-controller";
+        reg = <0x1fe78000 0x40>;
+        dmas = <&dma 0>;
+        dma-names = "rxtx";
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        nand@0 {
+            reg = <0>;
+            nand-use-soft-ecc-engine;
+            nand-ecc-algo = "hamming";
+        };
+    };

-- 
2.43.0

Hi Keguang,

> +patternProperties:
> +  "^nand@[0-3]$":
> +    type: object
> +    $ref: raw-nand-chip.yaml
> +
> +    required:
> +      - nand-use-soft-ecc-engine
> +      - nand-ecc-algo

Actually I told you a mistake. The no-ecc-engine case should remain
valid, so we cannot require these properties in the bindings.

My fault, sorry about that.

Thanks,
Miquèl

On Mon, Oct 7, 2024 at 10:10 PM Miquel Raynal <miquel.raynal@bootlin.com> wrote:
>
> Hi Keguang,
>
> > +patternProperties:
> > +  "^nand@[0-3]$":
> > +    type: object
> > +    $ref: raw-nand-chip.yaml
> > +
> > +    required:
> > +      - nand-use-soft-ecc-engine
> > +      - nand-ecc-algo
>
> Actually I told you a mistake. The no-ecc-engine case should remain
> valid, so we cannot require these properties in the bindings.
>
Then, remove this section, right?

> My fault, sorry about that.
>
> Thanks,
> Miquèl



-- 
Best regards,

Keguang Zhang

Hi Keguang,

keguang.zhang@gmail.com wrote on Wed, 16 Oct 2024 16:06:09 +0800:

> On Mon, Oct 7, 2024 at 10:10 PM Miquel Raynal <miquel.raynal@bootlin.com> wrote:
> >
> > Hi Keguang,
> >  
> > > +patternProperties:
> > > +  "^nand@[0-3]$":
> > > +    type: object
> > > +    $ref: raw-nand-chip.yaml
> > > +
> > > +    required:
> > > +      - nand-use-soft-ecc-engine
> > > +      - nand-ecc-algo  
> >
> > Actually I told you a mistake. The no-ecc-engine case should remain
> > valid, so we cannot require these properties in the bindings.
> >  
> Then, remove this section, right?

Yes, please.

Thanks,
Miquèl