scsi: ufs: make the UFS variant a platform device

This change turns the UFS variant (SCSI_UFS_QCOM) into a UFS
a platform device.
In order to do so a few additional changes are required:
1. The ufshcd-pltfrm is no longer serves as a platform device.
   Now it only serves as a group of platform APIs such as PM APIs
   (runtime suspend/resume, system suspend/resume etc), parsers of
   clocks, regulators and pm_levels from DT.
2. What used to be the old platform "probe" is now "only"
   a pltfrm_init() routine, that does exactly the same, but only
   being called by the new probe function of the UFS variant.

Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Gilad Broner <[email protected]>
Signed-off-by: Yaniv Gardi <[email protected]>
Tested-by: Alim Akhtar <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Documentation/devicetree/bindings/ufs/ufs-qcom.txt

@@ -0,0 +1,58 @@
+* Qualcomm Technologies Inc Universal Flash Storage (UFS) PHY
+
+UFSPHY nodes are defined to describe on-chip UFS PHY hardware macro.
+Each UFS PHY node should have its own node.
+
+To bind UFS PHY with UFS host controller, the controller node should
+contain a phandle reference to UFS PHY node.
+
+Required properties:
+- compatible        : compatible list, contains "qcom,ufs-phy-qmp-20nm"
+		      or "qcom,ufs-phy-qmp-14nm" according to the relevant phy in use.
+- reg               : should contain PHY register address space (mandatory),
+- reg-names         : indicates various resources passed to driver (via reg proptery) by name.
+                      Required "reg-names" is "phy_mem".
+- #phy-cells        : This property shall be set to 0
+- vdda-phy-supply   : phandle to main PHY supply for analog domain
+- vdda-pll-supply   : phandle to PHY PLL and Power-Gen block power supply
+- clocks	    : List of phandle and clock specifier pairs
+- clock-names       : List of clock input name strings sorted in the same
+		      order as the clocks property. "ref_clk_src", "ref_clk",
+		      "tx_iface_clk" & "rx_iface_clk" are mandatory but
+		      "ref_clk_parent" is optional
+
+Optional properties:
+- vdda-phy-max-microamp : specifies max. load that can be drawn from phy supply
+- vdda-pll-max-microamp : specifies max. load that can be drawn from pll supply
+- vddp-ref-clk-supply   : phandle to UFS device ref_clk pad power supply
+- vddp-ref-clk-max-microamp : specifies max. load that can be drawn from this supply
+- vddp-ref-clk-always-on : specifies if this supply needs to be kept always on
+
+Example:
+
+	ufsphy1: ufsphy@0xfc597000 {
+		compatible = "qcom,ufs-phy-qmp-20nm";
+		reg = <0xfc597000 0x800>;
+		reg-names = "phy_mem";
+		#phy-cells = <0>;
+		vdda-phy-supply = <&pma8084_l4>;
+		vdda-pll-supply = <&pma8084_l12>;
+		vdda-phy-max-microamp = <50000>;
+		vdda-pll-max-microamp = <1000>;
+		clock-names = "ref_clk_src",
+			"ref_clk_parent",
+			"ref_clk",
+			"tx_iface_clk",
+			"rx_iface_clk";
+		clocks = <&clock_rpm clk_ln_bb_clk>,
+			<&clock_gcc clk_pcie_1_phy_ldo >,
+			<&clock_gcc clk_ufs_phy_ldo>,
+			<&clock_gcc clk_gcc_ufs_tx_cfg_clk>,
+			<&clock_gcc clk_gcc_ufs_rx_cfg_clk>;
+	};
+
+	ufshc@0xfc598000 {
+		...
+		phys = <&ufsphy1>;
+		phy-names = "ufsphy";
+	};

Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt

@@ -4,11 +4,18 @@ UFSHC nodes are defined to describe on-chip UFS host controllers.
 Each UFS controller instance should have its own node.
 
 Required properties:
-- compatible        : compatible list, contains "jedec,ufs-1.1"
+- compatible		: must contain "jedec,ufs-1.1", may also list one or more
+					  of the following:
+					  "qcom,msm8994-ufshc"
+					  "qcom,msm8996-ufshc"
+					  "qcom,ufshc"
 - interrupts        : <interrupt mapping for UFS host controller IRQ>
 - reg               : <registers mapping>
 
 Optional properties:
+- phys                  : phandle to UFS PHY node
+- phy-names             : the string "ufsphy" when is found in a node, along
+                          with "phys" attribute, provides phandle to UFS PHY node
 - vdd-hba-supply        : phandle to UFS host controller supply regulator node
 - vcc-supply            : phandle to VCC supply regulator node
 - vccq-supply           : phandle to VCCQ supply regulator node
@@ -54,4 +61,6 @@ Example:
 		clocks = <&core 0>, <&ref 0>, <&iface 0>;
 		clock-names = "core_clk", "ref_clk", "iface_clk";
 		freq-table-hz = <100000000 200000000>, <0 0>, <0 0>;
+		phys = <&ufsphy1>;
+		phy-names = "ufsphy";
 	};