linux-kernel - [PATCH v6 1/3] dt-bindings: Add dma-channels property and modify compatible

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Date:   Fri,  4 Mar 2022 16:42:55 +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>, Palmer Dabbelt <palmer@...osinc.com>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH v6 1/3] dt-bindings: Add dma-channels property and modify compatible

Add dma-channels property, then we can determine how many channels there
by device tree, rather than statically defining it in PDMA driver.
In addition, we also modify the compatible for PDMA versioning scheme.

Signed-off-by: Zong Li <zong.li@...ive.com>
Suggested-by: Palmer Dabbelt <palmer@...osinc.com>
Reviewed-by: Rob Herring <robh@...nel.org>
Reviewed-by: Palmer Dabbelt <palmer@...osinc.com>
Acked-by: Palmer Dabbelt <palmer@...osinc.com>
---
 .../bindings/dma/sifive,fu540-c000-pdma.yaml  | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml b/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
index 75ad898c59bc..92f410f54d72 100644
--- a/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
+++ b/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
@@ -25,7 +25,15 @@ description: |
 properties:
   compatible:
     items:
-      - const: sifive,fu540-c000-pdma
+      - enum:
+          - sifive,fu540-c000-pdma
+      - const: sifive,pdma0
+    description:
+      Should be "sifive,<chip>-pdma" and "sifive,pdma<version>".
+      Supported compatible strings are -
+      "sifive,fu540-c000-pdma" for the SiFive PDMA v0 as integrated onto the
+      SiFive FU540 chip resp and "sifive,pdma0" for the SiFive PDMA v0 IP block
+      with no chip integration tweaks.
 
   reg:
     maxItems: 1
@@ -34,6 +42,12 @@ properties:
     minItems: 1
     maxItems: 8
 
+  dma-channels:
+    description: For backwards-compatibility, the default value is 4
+    minimum: 1
+    maximum: 4
+    default: 4
+
   '#dma-cells':
     const: 1
 
@@ -48,8 +62,9 @@ additionalProperties: false
 examples:
   - |
     dma@...0000 {
-      compatible = "sifive,fu540-c000-pdma";
+      compatible = "sifive,fu540-c000-pdma", "sifive,pdma0";
       reg = <0x3000000 0x8000>;
+      dma-channels = <4>;
       interrupts = <23>, <24>, <25>, <26>, <27>, <28>, <29>, <30>;
       #dma-cells = <1>;
     };
-- 
2.31.1