[PATCH 1/7] dt-bindings: sram: Document Allwinner H616 VE SRAM

Chen-Yu Tsai
2026-03-24T16:44:11Z

The Allwinner H616 has two switchable peripheral SRAM regions:

- The VE SRAM is a 2 MB dedicated SRAM for the Video Engine. CPU access
to this region is enabled by default. CPU access can be disabled,
after which reads will show the same stale value for all addresses,
while writes are ignored.

The mux value for this region is different from previous generations,
and thus needs a completely new compatible.

- The SRAM C region is an alias of the first 128 KB of VE SRAM, plus 64
KB of DE SRAM. The latter is otherwise unaccessible from the CPU. When
CPU access is disabled, the whole region reads as zero, while writes
are ignored.

The mux value for this region is the same as on the A64 and H6. The
existing compatible for the A64 already covers this.

Add the compatible for the VE SRAM to the list of covered compatibles in
the generic SRAM region binding.

Signed-off-by: Chen-Yu Tsai <wens@kernel.org>
---
Documentation/devicetree/bindings/sram/sram.yaml | 1 +
1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/sram/sram.yaml b/Documentation/devicetree/bindings/sram/sram.yaml
index c451140962c8..ddaab84f7ba0 100644
--- a/Documentation/devicetree/bindings/sram/sram.yaml
+++ b/Documentation/devicetree/bindings/sram/sram.yaml
@@ -81,6 +81,7 @@ patternProperties:
- allwinner,sun4i-a10-sram-d
- allwinner,sun9i-a80-smp-sram
- allwinner,sun50i-a64-sram-c
+ - allwinner,sun50i-h616-ve-sram
- amlogic,meson8-ao-arc-sram
- amlogic,meson8b-ao-arc-sram
- amlogic,meson8-smp-sram
--
2.47.3