phy: miphy365x: Add Device Tree bindings for the MiPHY365x

The MiPHY365x is a Generic PHY which can serve various SATA or PCIe
devices. It has 2 ports which it can use for either; both SATA, both
PCIe or one of each in any configuration.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/Documentation/devicetree/bindings/phy/phy-miphy365x.txt b/Documentation/devicetree/bindings/phy/phy-miphy365x.txt
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+STMicroelectronics STi MIPHY365x PHY binding
+============================================
+
+This binding describes a miphy device that is used to control PHY hardware
+for SATA and PCIe.
+
+Required properties (controller (parent) node):
+- compatible    : Should be "st,miphy365x-phy"
+- st,syscfg     : Should be a phandle of the system configuration register group
+                 which contain the SATA, PCIe 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:
+                       - MIPHY_TYPE_SATA
+                       - MIPHY_TYPE_PCI
+- 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":
+                       - sata:   For SATA devices
+                       - pcie:   For PCIe devices
+                       - syscfg: To specify the syscfg based config register
+
+Optional properties (port (child) node):
+- st,sata-gen       :  Generation of locally attached SATA IP. Expected values
+                       are {1,2,3). If not supplied generation 1 hardware will
+                       be expected
+- st,pcie-tx-pol-inv : Bool property to invert the polarity PCIe Tx (Txn/Txp)
+- st,sata-tx-pol-inv : Bool property to invert the polarity SATA Tx (Txn/Txp)
+
+Example:
+
+       miphy365x_phy: miphy365x@fe382000 {
+               compatible      = "st,miphy365x-phy";
+               st,syscfg       = <&syscfg_rear>;
+               #address-cells  = <1>;
+               #size-cells     = <1>;
+               ranges;
+
+               phy_port0: port@fe382000 {
+                       reg = <0xfe382000 0x100>, <0xfe394000 0x100>, <0x824 0x4>;
+                       reg-names = "sata", "pcie", "syscfg";
+                       #phy-cells = <1>;
+                       st,sata-gen = <3>;
+               };
+
+               phy_port1: port@fe38a000 {
+                       reg = <0xfe38a000 0x100>, <0xfe804000 0x100>, <0x828 0x4>;;
+                       reg-names = "sata", "pcie", "syscfg";
+                       #phy-cells = <1>;
+                       st,pcie-tx-pol-inv;
+               };
+       };
+
+Specifying phy control of devices
+=================================
+
+Device nodes should specify the configuration required in their "phys"
+property, containing a phandle to the phy port node and a device type.
+
+Example:
+
+#include <dt-bindings/phy/phy-miphy365x.h>
+
+       sata0: sata@fe380000 {
+               ...
+               phys      = <&phy_port0 MIPHY_TYPE_SATA>;
+               ...
+       };