linux-kernel - [PATCH v4 2/3] dt-bindings: Add dma-channels for pdma device node

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Message-Id: <5db314b798cd9cfcb5cb61bc56515220b7d50315.1642383007.git.zong.li@sifive.com>
Date:   Mon, 17 Jan 2022 09:35:27 +0800
From:   Zong Li <zong.li@...ive.com>
To:     robh+dt@...nel.org, paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, krzysztof.kozlowski@...onical.com,
        conor.dooley@...rochip.com, geert@...ux-m68k.org,
        bin.meng@...driver.com, green.wan@...ive.com, vkoul@...nel.org,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Cc:     Zong Li <zong.li@...ive.com>
Subject: [PATCH v4 2/3] dt-bindings: Add dma-channels for pdma device node

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@...ive.com>
---
 .../devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml    | 7 +++++++
 1 file changed, 7 insertions(+)

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@...0000 {
       compatible = "sifive,fu540-c000-pdma";
       reg = <0x3000000 0x8000>;
+      dma-channels = <4>;
       interrupts = <23 24 25 26 27 28 29 30>;
       #dma-cells = <1>;
     };
-- 
2.31.1