linux-kernel - Re: [PATCH 1/2] phy: zynqmp: Add dt bindings for ZynqMP PHY.

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Date:	Wed, 13 Jan 2016 16:38:58 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>,
	<robh@...nel.org>
CC:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
Subject: Re: [PATCH 1/2] phy: zynqmp: Add dt bindings for ZynqMP PHY.

Hi,

On Wednesday 13 January 2016 02:52 PM, Subbaraya Sundeep Bhatta wrote:
> This patch adds the document describing dt bindings for ZynqMP
> PHY. ZynqMP SOC has a High Speed Processing System Gigabit
> Transceiver which provides PHY capabilties to USB, SATA,
> PCIE, Display Port and Ehernet SGMII controllers.
> 
> Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
> ---
>  .../devicetree/bindings/phy/phy-zynqmp.txt         | 104 +++++++++++++++++++++
>  1 file changed, 104 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/phy-zynqmp.txt
> 
> diff --git a/Documentation/devicetree/bindings/phy/phy-zynqmp.txt b/Documentation/devicetree/bindings/phy/phy-zynqmp.txt
> new file mode 100644
> index 0000000..ec0d3de
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/phy-zynqmp.txt
> @@ -0,0 +1,104 @@
> +Xilinx ZynqMP PHY binding
> +
> +This binding describes a ZynqMP PHY device that is used to control ZynqMP
> +High Speed Gigabit Transceiver(GT). ZynqMP PS GTR provides four lanes
> +and are used by USB, SATA, PCIE, Display port and Ethernet SGMMI controllers.
> +
> +Required properties (controller (parent) node):
> +- compatible    : Should be "xlnx,zynqmp-psgtr"
> +
> +- reg		: Address and length of register sets for each device in
> +		  "reg-names"
> +- reg-names     : The names of the register addresses corresponding to the
> +		  registers filled in "reg":
> +			- serdes: SERDES block register set
> +			- siou: SIOU block register set
> +			- lpd: Low power domain peripherals reset control
> +			- fpd: Full power domain peripherals reset control
> +
> +-xlnx,tx_termination_fix: Include fix for a functional issue in the GT. The TX
> +			  termination resistance can be out of spec due to a
> +			  bug in the calibration logic. This issue will be fixed
> +			  in silicon in future versions.
> +
> +Required nodes	:  A sub-node is required for each lane the controller
> +		   provides. These nodes are translated by the driver's
> +		   .xlate() function.

driver details need not be in the binding documentation.
> +
> +Required properties (port (child) nodes):
> +lane0:
> +- #phy-cells	: Should be 1
> +		  Cell after port phandle is device type from:
> +			- XPSGTR_TYPE_PCIE_0
> +			- XPSGTR_TYPE_SATA_0
> +			- XPSGTR_TYPE_USB0
> +			- XPSGTR_TYPE_DP_1
> +			- XPSGTR_TYPE_SGMII0

Why not use the already existing PHY TYPES?
phy-cells can be made as '2' and the last cell can be used as index if that's
required.

Thanks
Kishon