phy: miphy28lp: Add Device Tree bindings for the MiPHY28lp

The MiPHY28lp is a Generic PHY which can serve various SATA or PCIe
or USB3 devices.

Signed-off-by: alexandre torgue <alexandre.torgue@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@linaro.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/Documentation/devicetree/bindings/phy/phy-miphy28lp.txt b/Documentation/devicetree/bindings/phy/phy-miphy28lp.txt
new file mode 100644 (file)
index 0000000..b7c13ad
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-miphy28lp.txt
@@ -0,0 +1,126 @@
+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