netdev - RE: [PATCH net-next v2 1/2] dt-bindings: net: xilinx

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Message-ID: <BY5PR02MB65203D654C8B9E991B8EFDC9C76F9@BY5PR02MB6520.namprd02.prod.outlook.com>
Date:   Fri, 12 Mar 2021 18:39:34 +0000
From:   Radhey Shyam Pandey <radheys@...inx.com>
To:     Robert Hancock <robert.hancock@...ian.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH net-next v2 1/2] dt-bindings: net: xilinx_axienet:
 Document additional clocks

> -----Original Message-----
> From: Robert Hancock <robert.hancock@...ian.com>
> Sent: Friday, March 12, 2021 11:13 PM
> To: Radhey Shyam Pandey <radheys@...inx.com>; davem@...emloft.net;
> kuba@...nel.org
> Cc: netdev@...r.kernel.org; devicetree@...r.kernel.org; Robert Hancock
> <robert.hancock@...ian.com>
> Subject: [PATCH net-next v2 1/2] dt-bindings: net: xilinx_axienet: Document
> additional clocks
> 
> Update DT bindings to describe all of the clocks that the axienet driver will
> now be able to make use of.
> 
> Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
> ---
>  .../bindings/net/xilinx_axienet.txt           | 25 ++++++++++++++-----
>  1 file changed, 19 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> index 2cd452419ed0..5df5ba449b8f 100644
> --- a/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> +++ b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> @@ -42,11 +42,23 @@ Optional properties:
>  		  support both 1000BaseX and SGMII modes. If set, the phy-
> mode
>  		  should be set to match the mode selected on core reset
> (i.e.
>  		  by the basex_or_sgmii core input line).
> -- clocks	: AXI bus clock for the device. Refer to common clock
> bindings.
> -		  Used to calculate MDIO clock divisor. If not specified, it is
> -		  auto-detected from the CPU clock (but only on platforms
> where
> -		  this is possible). New device trees should specify this - the
> -		  auto detection is only for backward compatibility.
> +- clock-names: 	  Tuple listing input clock names. Possible clocks:
> +		  s_axi_lite_clk: Clock for AXI register slave interface
> +		  axis_clk: AXI stream clock for DMA block

Description for axis_clk should be-
axis_clk: AXI4-Stream clock for TXD RXD TXC and RXS interfaces.
In this patch I assume we are only adding additional clocks for 
1G ethernet subsystem. For dma clocking support we need to add 
more clocks and better to add them in a separate patch. Please refer to
xilinx tree.
> +		  ref_clk: Ethernet reference clock, used by signal delay
> +			   primitives and transceivers
> +		  mgt_clk: MGT reference clock (used by optional internal
> +			   PCS/PMA PHY)
> +
> +		  Note that if s_axi_lite_clk is not specified by name, the
> +		  first clock of any name is used for this. If that is also not
> +		  specified, the clock rate is auto-detected from the CPU
> clock
> +		  (but only on platforms where this is possible). New device
> +		  trees should specify all applicable clocks by name - the
> +		  fallbacks to an unnamed clock or to CPU clock are only for
> +		  backward compatibility.
> +- clocks: 	  Phandles to input clocks matching clock-names. Refer to
> common
> +		  clock bindings.
>  - axistream-connected: Reference to another node which contains the
> resources
>  		       for the AXI DMA controller used by this device.
>  		       If this is specified, the DMA-related resources from that
> @@ -62,7 +74,8 @@ Example:
>  		device_type = "network";
>  		interrupt-parent = <&microblaze_0_axi_intc>;
>  		interrupts = <2 0 1>;
> -		clocks = <&axi_clk>;
> +		clock-names = "s_axi_lite_clk", "axis_clk", "ref_clk",
> "mgt_clk";
> +		clocks = <&axi_clk>, <&axi_clk>, <&pl_enet_ref_clk>,
> <&mgt_clk>;
>  		phy-mode = "mii";
>  		reg = <0x40c00000 0x40000 0x50c00000 0x40000>;
>  		xlnx,rxcsum = <0x2>;
> --
> 2.27.0