linux-kernel - Re: [PATCH 14/14] net: axienet: Update devicetree binding documentation

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Date:   Tue, 21 Jan 2020 15:51:09 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andre Przywara <andre.przywara@....com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        Robert Hancock <hancock@...systems.ca>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: Re: [PATCH 14/14] net: axienet: Update devicetree binding
 documentation

On Fri, Jan 10, 2020 at 11:54:15AM +0000, Andre Przywara wrote:
> This adds documentation about the newly introduced, optional
> "xlnx,addrwidth" property to the binding documentation.
> 
> While at it, clarify the wording on some properties, replace obsolete
> .txt file references with their new .yaml counterparts, and add a more
> modern example, using the axistream-connected property.
> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Andre Przywara <andre.przywara@....com>
> ---
>  .../bindings/net/xilinx_axienet.txt           | 57 ++++++++++++++++---
>  1 file changed, 50 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/xilinx_axienet.txt b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> index 7360617cdedb..78c278c5200f 100644
> --- a/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> +++ b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> @@ -12,7 +12,8 @@ sent and received through means of an AXI DMA controller. This driver
>  includes the DMA driver code, so this driver is incompatible with AXI DMA
>  driver.
>  
> -For more details about mdio please refer phy.txt file in the same directory.
> +For more details about mdio please refer to the ethernet-phy.yaml file in
> +the same directory.
>  
>  Required properties:
>  - compatible	: Must be one of "xlnx,axi-ethernet-1.00.a",
> @@ -27,14 +28,14 @@ Required properties:
>  		  instead, and only the Ethernet core interrupt is optionally
>  		  specified here.
>  - phy-handle	: Should point to the external phy device.
> -		  See ethernet.txt file in the same directory.
> -- xlnx,rxmem	: Set to allocated memory buffer for Rx/Tx in the hardware
> +		  See the ethernet-controller.yaml file in the same directory.
> +- xlnx,rxmem	: Size of the RXMEM buffer in the hardware, in bytes.
>  
>  Optional properties:
> -- phy-mode	: See ethernet.txt
> +- phy-mode	: See ethernet-controller.yaml.
>  - xlnx,phy-type	: Deprecated, do not use, but still accepted in preference
>  		  to phy-mode.
> -- xlnx,txcsum	: 0 or empty for disabling TX checksum offload,
> +- xlnx,txcsum	: 0 for disabling TX checksum offload (default if omitted),
>  		  1 to enable partial TX checksum offload,
>  		  2 to enable full TX checksum offload
>  - xlnx,rxcsum	: Same values as xlnx,txcsum but for RX checksum offload
> @@ -48,10 +49,20 @@ Optional properties:
>  		       If this is specified, the DMA-related resources from that
>  		       device (DMA registers and DMA TX/RX interrupts) rather
>  		       than this one will be used.
> - - mdio		: Child node for MDIO bus. Must be defined if PHY access is
> +- mdio		: Child node for MDIO bus. Must be defined if PHY access is
>  		  required through the core's MDIO interface (i.e. always,
>  		  unless the PHY is accessed through a different bus).
>  
> +Required properties for axistream-connected subnode:
> +- reg		: Address and length of the AXI DMA controller MMIO space.
> +- interrupts	: A list of 2 interrupts: TX DMA and RX DMA, in that order.
> +
> +Optional properties for axistream-connected subnode:
> +- xlnx,addrwidth: Specifies the configured address width of the DMA. Newer
> +		  versions of the IP allow setting this to a value between
> +		  32 and 64. Defaults to 32 bits if not specified.

I think this should be expressed using dma-ranges. This is exactly the 
purpose of dma-ranges and we shouldn't need a device specific property 
for this sort of thing.

Rob