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

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Date:   Fri, 12 Mar 2021 07:57:06 +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>,
        Anirudha Sarangi <anirudh@...inx.com>
Subject: RE: [PATCH net-next 1/2] dt-bindings: net: xilinx_axienet: Document
 additional clocks

Thanks for the patch.

> -----Original Message-----
> From: Robert Hancock <robert.hancock@...ian.com>
> Sent: Friday, March 12, 2021 1:41 AM
> 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 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           | 23 ++++++++++++++-----
>  1 file changed, 17 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> index 2cd452419ed0..1ee1c6c5fc66 100644
> --- a/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> +++ b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> @@ -42,11 +42,21 @@ 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

Based on PG138 , axis_clk is 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 it in separate
patch. Please refer to xilinx tree.

> +		  ref_clk: Ethernet reference clock

Better to add some more description -  used by signal delay primitives and transceivers.
> +		  mgt_clk: MGT reference clock (used by internal PCS/PMA
> PHY)
(used by optional internal PCS/PMA)
> +
> +		  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 +72,8 @@ 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