[v2,0/5] arm: aspeed: Add UART DMA support

This patch serias adds the 8250 driver with DMA support for AST26xx UART devices

v2 change:
 - re-write UDMA driver based on the DMAEngine framework
 - re-write 8250_aspeed driver with DMA support based on the 8250_dma implementation
 - remove virtual UART part as there is already a 8250_aspeed_vuart driver

Chia-Wei Wang (5):
  dt-bindings: serial: 8250: Add aspeed,ast2600-uart
  dt-bindings: dmaengine: Add AST2600 UDMA bindings
  dmaengine: aspeed: Add AST2600 UART DMA driver
  serial: 8250: Add AST2600 UART driver
  ARM: dts: aspeed-g6: Add UDMA node

 .../bindings/dma/aspeed,ast2600-udma.yaml     |  56 ++
 .../devicetree/bindings/serial/8250.yaml      |   1 +
 arch/arm/boot/dts/aspeed-g6.dtsi              |   9 +
 drivers/dma/Kconfig                           |   9 +
 drivers/dma/Makefile                          |   1 +
 drivers/dma/ast2600-udma.c                    | 528 ++++++++++++++++++
 drivers/tty/serial/8250/8250_aspeed.c         | 224 ++++++++
 drivers/tty/serial/8250/Kconfig               |   8 +
 drivers/tty/serial/8250/Makefile              |   1 +
 include/dt-bindings/dma/ast2600-udma.h        |  40 ++
 10 files changed, 877 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/aspeed,ast2600-udma.yaml
 create mode 100644 drivers/dma/ast2600-udma.c
 create mode 100644 drivers/tty/serial/8250/8250_aspeed.c
 create mode 100644 include/dt-bindings/dma/ast2600-udma.h

On Tue, 14 Mar 2023 10:18:13 +0800, Chia-Wei Wang wrote:
> Add a compatible string for the NS16550A-compatible UARTs
> of Aspeed AST2600 SoCs.
> 
> Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
> ---
>  Documentation/devicetree/bindings/serial/8250.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

On Tue, Mar 14, 2023 at 10:18:14AM +0800, Chia-Wei Wang wrote:
> Add the dmaengine bindings for the UART DMA engine of Aspeed AST2600 SoC.
> 
> Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
> ---
>  .../bindings/dma/aspeed,ast2600-udma.yaml     | 56 +++++++++++++++++++
>  include/dt-bindings/dma/ast2600-udma.h        | 40 +++++++++++++
>  2 files changed, 96 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/aspeed,ast2600-udma.yaml
>  create mode 100644 include/dt-bindings/dma/ast2600-udma.h
> 
> diff --git a/Documentation/devicetree/bindings/dma/aspeed,ast2600-udma.yaml b/Documentation/devicetree/bindings/dma/aspeed,ast2600-udma.yaml
> new file mode 100644
> index 000000000000..f92e06ac9f39
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/aspeed,ast2600-udma.yaml
> @@ -0,0 +1,56 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/aspeed,ast2600-udma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Aspeed AST2600 UART DMA controller
> +
> +maintainers:
> +  - Chia-Wei Wang <chiawei_wang@aspeedtech.com>
> +
> +description: |

Don't need '|'

> +  The Aspeed AST2600 UDMA controller provides direct memory access capabilities
> +  for the NS16550A-compatible UART devices inside AST2600 SoCs. UDMA supports 28
> +  DMA channels and each UART device has its dedicated pair of TX and RX channels.
> +
> +allOf:
> +  - $ref: "dma-controller.yaml#"

Drop quotes

> +
> +properties:
> +  compatible:
> +    const: aspeed,ast2600-udma
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  "#dma-cells":
> +    const: 1
> +
> +  dma-channels:
> +    maximum: 28
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - "#dma-cells"
> +  - dma-channels
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    udma: dma-controller@1e79e000 {

Drop unused label.

> +        compatible = "aspeed,ast2600-udma";
> +        reg = <0x1e79e000 0x1000>;
> +        interrupts = <GIC_SPI 56 IRQ_TYPE_LEVEL_HIGH>;
> +        dma-channels = <28>;
> +        #dma-cells = <1>;
> +    };
> +
> +...
> diff --git a/include/dt-bindings/dma/ast2600-udma.h b/include/dt-bindings/dma/ast2600-udma.h
> new file mode 100644
> index 000000000000..0b92035b94f1
> --- /dev/null
> +++ b/include/dt-bindings/dma/ast2600-udma.h
> @@ -0,0 +1,40 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */

Headers should be dual licensed.

However, similar to interrupts, we don't normally do defines for DMA 
request numbers. It's only when we make up the numbering (e.g. clock 
ids).

Rob