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.
- st,syscfg : Offset of the parent configuration register.
- 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).
- st,scc-on : enable ssc to reduce effects of EMI (only for sata or PCIe).
- st,tx-impedance-comp : to compensate tx impedance avoiding out of range values.
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>;
reg-names = "sata-up",
"pcie-up",
"pipew";
st,syscfg = <0x114 0x818 0xe0 0xec>;
#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>;
reg-names = "sata-up",
"pcie-up",
"pipew";
st,syscfg = <0x118 0x81c 0xe4 0xf0>;
#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>;
reg-names = "pipew",
"usb3-up";
st,syscfg = <0x11c 0x820>;
#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.h
