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Date: Tue, 15 Dec 2020 08:08:55 +0000
From: "Sia, Jee Heng" <jee.heng.sia@...el.com>
To: Rob Herring <robh@...nel.org>
CC: "vkoul@...nel.org" <vkoul@...nel.org>,
"Eugeniy.Paltsev@...opsys.com" <Eugeniy.Paltsev@...opsys.com>,
"andriy.shevchenko@...ux.intel.com"
<andriy.shevchenko@...ux.intel.com>,
"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH v6 01/16] dt-bindings: dma: Add YAML schemas for
dw-axi-dmac
> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: 15 December 2020 6:52 AM
> To: Sia, Jee Heng <jee.heng.sia@...el.com>
> Cc: vkoul@...nel.org; Eugeniy.Paltsev@...opsys.com;
> andriy.shevchenko@...ux.intel.com; dmaengine@...r.kernel.org;
> linux-kernel@...r.kernel.org; devicetree@...r.kernel.org
> Subject: Re: [PATCH v6 01/16] dt-bindings: dma: Add YAML schemas
> for dw-axi-dmac
>
> On Fri, Dec 11, 2020 at 08:46:27AM +0800, Sia Jee Heng wrote:
> > YAML schemas Device Tree (DT) binding is the new format for DT to
> > replace the old format. Introduce YAML schemas DT binding for
> > dw-axi-dmac and remove the old version.
> >
> > Signed-off-by: Sia Jee Heng <jee.heng.sia@...el.com>
> > ---
> > .../bindings/dma/snps,dw-axi-dmac.txt | 39 ------
> > .../bindings/dma/snps,dw-axi-dmac.yaml | 125
> ++++++++++++++++++
> > 2 files changed, 125 insertions(+), 39 deletions(-) delete mode
> > 100644 Documentation/devicetree/bindings/dma/snps,dw-axi-
> dmac.txt
> > create mode 100644
> > Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
>
>
> > diff --git
> > a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
> > b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
> > new file mode 100644
> > index 000000000000..61ad37a3f559
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-
> dmac.yaml
> > @@ -0,0 +1,125 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML
> 1.2
> > +---
> > +$id: http://devicetree.org/schemas/dma/snps,dw-axi-dmac.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Synopsys DesignWare AXI DMA Controller
> > +
> > +maintainers:
> > + - Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
> > +
> > +description:
> > + Synopsys DesignWare AXI DMA Controller DT Binding
>
> allOf:
> - $ref: dma-controller.yaml#
[>>] Thanks. Will include it in next version.
>
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - snps,axi-dma-1.01a
> > +
> > + reg:
> > + items:
> > + - description: Address range of the DMAC registers
> > +
> > + reg-names:
> > + items:
> > + - const: axidma_ctrl_regs
> > +
> > + interrupts:
> > + maxItems: 1
> > +
> > + clocks:
> > + items:
> > + - description: Bus Clock
> > + - description: Module Clock
> > +
> > + clock-names:
> > + items:
> > + - const: core-clk
> > + - const: cfgr-clk
> > +
> > + '#dma-cells':
> > + const: 1
> > +
> > + dma-channels:
> > + description: |
> > + Number of channels supported by hardware.
>
> Already described in dma-controller.yaml
[>>] Thanks. Will remove the description in next version but keep the constraint.
>
> > + minimum: 1
> > + maximum: 8
> > +
> > + snps,dma-masters:
> > + description: |
> > + Number of AXI masters supported by the hardware.
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + enum: [1, 2]
> > + default: 2
> > +
> > + snps,data-width:
> > + description: |
> > + AXI data width supported by hardware.
> > + (0 - 8bits, 1 - 16bits, 2 - 32bits, ..., 6 - 512bits)
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + enum: [0, 1, 2, 3, 4, 5, 6]
> > + default: 4
> > +
> > + snps,priority:
> > + description: |
> > + Channel priority specifier associated with the DMA channels.
> > + $ref: /schemas/types.yaml#/definitions/uint32-array
> > + minItems: 1
> > + maxItems: 8
> > + default: [0, 1, 2, 3]
> > +
> > + snps,block-size:
> > + description: |
> > + Channel block size specifier associated with the DMA channels.
> > + $ref: /schemas/types.yaml#/definitions/uint32-array
> > + minItems: 1
> > + maxItems: 8
> > + default: [4096, 4096, 4096, 4096]
> > +
> > + snps,axi-max-burst-len:
> > + description: |
> > + Restrict master AXI burst length by value specified in this
> property.
> > + If this property is missing the maximum AXI burst length
> supported by
> > + DMAC is used.
> > + $ref: /schemas/types.yaml#/definitions/uint32
> > + minimum: 1
> > + maximum: 256
> > + default: 16
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - clocks
> > + - clock-names
> > + - interrupts
> > + - '#dma-cells'
>
> Already required.
[>>] Hope the comment "already required" is for the below properties.
>
> > + - dma-channels
> > + - snps,dma-masters
> > + - snps,data-width
> > + - snps,priority
> > + - snps,block-size
>
> How can these be both required and have a default?
[>>] Thanks. Those are required properties, perhaps I should remove the default field to avoid misunderstanding.
>
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/interrupt-controller/arm-gic.h>
> > + #include <dt-bindings/interrupt-controller/irq.h>
> > + /* example with snps,dw-axi-dmac */
> > + dmac: dma-controller@...00 {
> > + compatible = "snps,axi-dma-1.01a";
> > + reg = <0x80000 0x400>;
> > + clocks = <&core_clk>, <&cfgr_clk>;
> > + clock-names = "core-clk", "cfgr-clk";
> > + interrupt-parent = <&intc>;
> > + interrupts = <27>;
> > + #dma-cells = <1>;
> > + dma-channels = <4>;
> > + snps,dma-masters = <2>;
> > + snps,data-width = <3>;
> > + snps,block-size = <4096 4096 4096 4096>;
> > + snps,priority = <0 1 2 3>;
> > + snps,axi-max-burst-len = <16>;
> > + };
> > --
> > 2.18.0
> >
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