| Message ID | 7cc9a7b5f7e6c28fc9eb172c441b5aed2159b8a0.1648461096.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 |
On Mon, Mar 28, 2022 at 7:56 PM Zong Li <zong.li@sifive.com> wrote: > > 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@sifive.com> > Reviewed-by: Rob Herring <robh@kernel.org> > Suggested-by: Palmer Dabbelt <palmer@rivosinc.com> > Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com> > Acked-by: Palmer Dabbelt <palmer@rivosinc.com> > Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> > --- > .../bindings/dma/sifive,fu540-c000-pdma.yaml | 19 +++++++++++++++++-- > 1 file changed, 17 insertions(+), 2 deletions(-) > Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml b/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml index 47c46af25536..3271755787b4 100644 --- a/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml +++ b/Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml @@ -28,7 +28,15 @@ allOf: 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 @@ -37,6 +45,12 @@ 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 @@ -50,8 +64,9 @@ unevaluatedProperties: false examples: - | dma-controller@3000000 { - 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>; };