Hi Krzysztof,
On 17/08/2025 09:19, Krzysztof Kozlowski wrote:
On 14/08/2025 16:42, Clément Le Goffic wrote:
Hi Rob,
On 30/07/2025 23:11, Rob Herring wrote:
On Mon, Jul 28, 2025 at 05:29:37PM +0200, Clément Le Goffic wrote:
Introduce JEDEC compliant DDR bindings, that use new memory-props binding.
Signed-off-by: Clément Le Goffic <clement.legoffic@xxxxxxxxxxx>
---
.../memory-controllers/ddr/jedec,ddr4.yaml | 34 ++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr4.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr4.yaml
new file mode 100644
index 000000000000..f457066a2f8b
--- /dev/null
+++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr4.yaml
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,ddr4.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: DDR3 SDRAM compliant to JEDEC JESD79-4D
+
+maintainers:
+ - Krzysztof Kozlowski <krzk@xxxxxxxxxx>
+
+allOf:
+ - $ref: jedec,sdram-props.yaml#
+
+properties:
+ compatible:
+ items:
+ - pattern: "^ddr4-[0-9a-f]{2},[0-9a-f]{1}$"
Shouldn't this be 'jedec,ddr4-...'
That's not the case for lpddr bindings, I wanted both lpddr and ddr
bindings to be similar but this can change.
For LPDDR Julius introduced in commit 686fe63b2280 ("dt-bindings:
memory: Add numeric LPDDR compatible string variant") ddr4-VENDORID
pattern to distinguish individual manufacturers.
Jedec is not really the vendor here.
Is it the same case in DDR? You have a defined list of vendor IDs (also
1 byte)?
There is no defined list of vendor IDs.
The way the compatible string is created is explained in
jedec,sdram-props.yaml file which is created in patch 5 of this series.
Best regards,
Clément
