phy: miphy28lp: Add Device Tree bindings for the MiPHY28lp

STMicroelectronics STi MIPHY28LP PHY binding

============================================

This binding describes a miphy device that is used to control PHY hardware

for SATA, PCIe or USB3.

Required properties (controller (parent) node):

- compatible	: Should be "st,miphy28lp-phy".

- st,syscfg	: Should be a phandle of the system configuration register group

		  which contain the SATA, PCIe or USB3 mode setting bits.

Required nodes	:  A sub-node is required for each channel the controller

		   provides. Address range information including the usual

		   'reg' and 'reg-names' properties are used inside these

		   nodes to describe the controller's topology. These nodes

		   are translated by the driver's .xlate() function.

Required properties (port (child) node):

- #phy-cells	: Should be 1 (See second example)

		  Cell after port phandle is device type from:

			- PHY_TYPE_SATA

			- PHY_TYPE_PCI

			- PHY_TYPE_USB3

- reg		: Address and length of the register set for the device.

- reg-names	: The names of the register addresses corresponding to the registers

		  filled in "reg". It can also contain the offset of the system configuration

		  registers used as glue-logic to setup the device for SATA/PCIe or USB3

		  devices.

- resets	: phandle to the parent reset controller.

- reset-names	: Associated name must be "miphy-sw-rst".

Optional properties (port (child) node):

- st,osc-rdy		: to check the MIPHY0_OSC_RDY status in the glue-logic. This

			  is not available in all the MiPHY. For example, for STiH407, only the

			  MiPHY0 has this bit.

- st,osc-force-ext	: to select the external oscillator. This can change from

			  different MiPHY inside the same SoC.

- st,sata_gen		: to select which SATA_SPDMODE has to be set in the SATA system config

			  register.

- st,px_rx_pol_inv	: to invert polarity of RXn/RXp (respectively negative line and positive

			  line).

example:

		miphy28lp_phy: miphy28lp@9b22000 {

			compatible = "st,miphy28lp-phy";

			st,syscfg = <&syscfg_core>;

			#address-cells	= <1>;

			#size-cells	= <1>;

			ranges;

			phy_port0: port@9b22000 {

				reg = <0x9b22000 0xff>,

				      <0x9b09000 0xff>,

				      <0x9b04000 0xff>,

				      <0x114 0x4>, /* sysctrl MiPHY cntrl */

				      <0x818 0x4>, /* sysctrl MiPHY status*/

				      <0xe0  0x4>, /* sysctrl PCIe */

				      <0xec  0x4>; /* sysctrl SATA */

				reg-names = "sata-up",

					    "pcie-up",

					    "pipew",

					    "miphy-ctrl-glue",

					    "miphy-status-glue",

					    "pcie-glue",

					    "sata-glue";

				#phy-cells = <1>;

				st,osc-rdy;

				reset-names = "miphy-sw-rst";

				resets = <&softreset STIH407_MIPHY0_SOFTRESET>;

			};

			phy_port1: port@9b2a000 {

				reg = <0x9b2a000 0xff>,

				      <0x9b19000 0xff>,

				      <0x9b14000 0xff>,

				      <0x118 0x4>,

				      <0x81c 0x4>,

				      <0xe4  0x4>,

				      <0xf0  0x4>;

				reg-names = "sata-up",

					    "pcie-up",

					    "pipew",

					    "miphy-ctrl-glue",

					    "miphy-status-glue",

					    "pcie-glue",

					    "sata-glue";

				#phy-cells = <1>;

				st,osc-force-ext;

				reset-names = "miphy-sw-rst";

				resets = <&softreset STIH407_MIPHY1_SOFTRESET>;

			};

			phy_port2: port@8f95000 {

				reg = <0x8f95000 0xff>,

				      <0x8f90000 0xff>,

				      <0x11c 0x4>,

				      <0x820 0x4>;

				reg-names = "pipew",

				    "usb3-up",

				    "miphy-ctrl-glue",

				    "miphy-status-glue";

				#phy-cells = <1>;

				reset-names = "miphy-sw-rst";

				resets = <&softreset STIH407_MIPHY2_SOFTRESET>;

			};

		};

Specifying phy control of devices

=================================

Device nodes should specify the configuration required in their "phys"

property, containing a phandle to the miphy device node and an index

specifying which configuration to use, as described in phy-bindings.txt.

example:

		sata0: sata@9b20000  {

			...

			phys		= <&phy_port0 PHY_TYPE_SATA>;

			...

		};

Macro definitions for the supported miphy configuration can be found in:

include/dt-bindings/phy/phy-miphy28lp.h