diff mbox series

[v2,2/3] dt-bindings: Add dma-channels for pdma device node

Message ID 5db314b798cd9cfcb5cb61bc56515220b7d50315.1641890718.git.zong.li@sifive.com (mailing list archive)
State New, archived
Headers show
Series Determine the number of DMA channels by 'dma-channels' property | expand

Commit Message

Zong Li Jan. 11, 2022, 8:51 a.m. UTC 
Add dma-channels property, then we can determine how many channels there
by device tree, rather than statically defines it in PDMA driver

Signed-off-by: Zong Li <zong.li@sifive.com>
---
 .../devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml    | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml b/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
index d32a71b975fe..3dbb8caefc17 100644
--- a/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
+++ b/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
@@ -34,6 +34,12 @@  properties:
     minItems: 1
     maxItems: 8
 
+  dma-channels:
+    description: For backwards-compatible, the default value is 4
+    minimum: 1
+    maximum: 4
+    default: 4
+
   '#dma-cells':
     const: 1
 
@@ -50,6 +56,7 @@  examples:
     dma@3000000 {
       compatible = "sifive,fu540-c000-pdma";
       reg = <0x3000000 0x8000>;
+      dma-channels = <4>;
       interrupts = <23 24 25 26 27 28 29 30>;
       #dma-cells = <1>;
     };