linux-kernel - Re: [PATCH v9 1/5] dt-bindings: soc: Add Aspeed XDMA Engine

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Date:   Fri, 17 Apr 2020 11:22:11 -0500
From:   Rob Herring <robh@...nel.org>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, joel@....id.au, andrew@...id.au
Subject: Re: [PATCH v9 1/5] dt-bindings: soc: Add Aspeed XDMA Engine

On Thu, Apr 16, 2020 at 03:03:35PM -0500, Eddie James wrote:
> Document the bindings for the Aspeed AST25XX and AST26XX XDMA engine.
> 
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>
> Reviewed-by: Andrew Jeffery <andrew@...id.au>
> ---
> Changes since v8:
>  - dropped Rob's tag since this has changed significantly since he last looked
>    it over.

If this is not merged soon, you're going to need to convert to schema.

>  .../devicetree/bindings/soc/aspeed/xdma.txt        | 45 ++++++++++++++++++++++
>  MAINTAINERS                                        |  6 +++
>  2 files changed, 51 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/aspeed/xdma.txt
> 
> diff --git a/Documentation/devicetree/bindings/soc/aspeed/xdma.txt b/Documentation/devicetree/bindings/soc/aspeed/xdma.txt
> new file mode 100644
> index 0000000..35d0507
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/aspeed/xdma.txt
> @@ -0,0 +1,45 @@
> +Aspeed AST25XX and AST26XX XDMA Engine
> +
> +The XDMA Engine embedded in the AST2500 and AST2600 SOCs can perform automatic
> +DMA operations over PCI between the SOC (acting as a BMC) and a host processor.
> +
> +Required properties:
> + - compatible		: must be "aspeed,ast2500-xdma" or
> +			  "aspeed,ast2600-xdma"
> + - reg			: contains the address and size of the memory region
> +			  associated with the XDMA engine registers
> + - clocks		: clock specifier for the clock associated with the
> +			  XDMA engine
> + - resets		: reset specifier for the syscon reset associated with
> +			  the XDMA engine, and, for the AST2600, a second reset
> +			  associated with the PCI-E root complex
> + - reset-names		: required only for the AST2600; must be
> +			  "device", "root-complex"
> + - interrupts-extended	: two interrupt cells; the first specifies the global
> +			  interrupt for the XDMA engine and the second
> +			  specifies the PCI-E reset or PERST interrupt.
> + - aspeed,scu		: a phandle to the syscon node for the system control
> +			  unit of the SOC
> + - memory-region	: a phandle to the reserved memory region to be used by
> +			  the XDMA engine for DMA operations
> +
> +Optional properties:
> + - pcie-device		: should be either "bmc" or "vga", corresponding to
> +			  which device should be used by the XDMA engine for
> +			  DMA operations. If this property is not set, the XDMA
> +			  engine will use the BMC PCI-E device.

aspeed,pcie-device

With that,

Reviewed-by: Rob Herring <robh@...nel.org>

> +
> +Example:
> +
> +    xdma@...e7000 {
> +        compatible = "aspeed,ast2600-xdma";
> +        reg = <0x1e6e7000 0x100>;
> +        clocks = <&syscon ASPEED_CLK_GATE_BCLK>;
> +        resets = <&syscon ASPEED_RESET_DEV_XDMA>, <&syscon ASPEED_RESET_RC_XDMA>;
> +        reset-names = "device", "root-complex";
> +        interrupts-extended = <&gic GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,
> +                              <&scu_ic0 ASPEED_AST2600_SCU_IC0_PCIE_PERST_LO_TO_HI>;
> +        aspeed,scu = <&syscon>;
> +        pcie-device = "bmc";
> +        memory-region = <&vga_memory>;
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 5e10560..66f82a2 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2771,6 +2771,12 @@ S:	Maintained
>  F:	Documentation/devicetree/bindings/media/aspeed-video.txt
>  F:	drivers/media/platform/aspeed-video.c
>  
> +ASPEED XDMA ENGINE DRIVER
> +M:	Eddie James <eajames@...ux.ibm.com>
> +L:	linux-aspeed@...ts.ozlabs.org (moderated for non-subscribers)
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/soc/aspeed/xdma.txt
> +
>  ASUS NOTEBOOKS AND EEEPC ACPI/WMI EXTRAS DRIVERS
>  M:	Corentin Chary <corentin.chary@...il.com>
>  L:	acpi4asus-user@...ts.sourceforge.net
> -- 
> 1.8.3.1
>