phy: miphy28lp: Pass sysconfig register offsets via syscfg dt property.

Based on Arnds review comments here https://lkml.org/lkml/2014/11/13/161,
update the miphy28lp phy driver to access sysconfig register offsets via
syscfg dt property.

This is because the reg property should not be mixing address spaces like
it does currently for miphy28lp. This change then also aligns us to how other
platforms such as keystone and bcm7445 pass there syscon offsets via DT.

I have updated the miphy28lp phy driver same way as Peter's implementation.

Signed-off-by: Gabriel Fernandez <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

Documentation/devicetree/bindings/phy/phy-miphy28lp.txt

···
 		  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".
 
···
 			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 */
+				      <0x9b04000 0xff>;
 				reg-names = "sata-up",
 					    "pcie-up",
-					    "pipew",
-					    "miphy-ctrl-glue",
-					    "miphy-status-glue",
-					    "pcie-glue",
-					    "sata-glue";
+					    "pipew";
+
+				st,syscfg = <0x114 0x818 0xe0 0xec>;
 				#phy-cells = <1>;
 				st,osc-rdy;
 				reset-names = "miphy-sw-rst";
···
 			phy_port1: port@9b2a000 {
 				reg = <0x9b2a000 0xff>,
 				      <0x9b19000 0xff>,
-				      <0x9b14000 0xff>,
-				      <0x118 0x4>,
-				      <0x81c 0x4>,
-				      <0xe4  0x4>,
-				      <0xf0  0x4>;
+				      <0x9b14000 0xff>;
 				reg-names = "sata-up",
 					    "pcie-up",
-					    "pipew",
-					    "miphy-ctrl-glue",
-					    "miphy-status-glue",
-					    "pcie-glue",
-					    "sata-glue";
+					    "pipew";
+
+				st,syscfg = <0x118 0x81c 0xe4 0xf0>;
+
 				#phy-cells = <1>;
 				st,osc-force-ext;
 				reset-names = "miphy-sw-rst";
···
 
 			phy_port2: port@8f95000 {
 				reg = <0x8f95000 0xff>,
-				      <0x8f90000 0xff>,
-				      <0x11c 0x4>,
-				      <0x820 0x4>;
+				      <0x8f90000 0xff>;
 				reg-names = "pipew",
-				    "usb3-up",
-				    "miphy-ctrl-glue",
-				    "miphy-status-glue";
+					    "usb3-up";
+
+				st,syscfg = <0x11c 0x820>;
+
 				#phy-cells = <1>;
 				reset-names = "miphy-sw-rst";
 				resets = <&softreset STIH407_MIPHY2_SOFTRESET>;
···
 
 Macro definitions for the supported miphy configuration can be found in:
 
-include/dt-bindings/phy/phy-miphy28lp.h
+include/dt-bindings/phy/phy.h

drivers/phy/phy-miphy28lp.c

···
 #define MIPHY_SATA_BANK_NB	3
 #define MIPHY_PCIE_BANK_NB	2
 
+enum {
+	SYSCFG_CTRL,
+	SYSCFG_STATUS,
+	SYSCFG_PCI,
+	SYSCFG_SATA,
+	SYSCFG_REG_MAX,
+};
+
 struct miphy28lp_phy {
 	struct phy *phy;
 	struct miphy28lp_dev *phydev;
···
 	u32 sata_gen;
 
 	/* Sysconfig registers offsets needed to configure the device */
-	u32 syscfg_miphy_ctrl;
-	u32 syscfg_miphy_status;
-	u32 syscfg_pci;
-	u32 syscfg_sata;
+	u32 syscfg_reg[SYSCFG_REG_MAX];
 	u8 type;
 };
 
···
 	if (!miphy_phy->osc_rdy)
 		return 0;
 
-	if (!miphy_phy->syscfg_miphy_status)
+	if (!miphy_phy->syscfg_reg[SYSCFG_STATUS])
 		return -EINVAL;
 
 	do {
-		regmap_read(miphy_dev->regmap, miphy_phy->syscfg_miphy_status,
-			    &val);
+		regmap_read(miphy_dev->regmap,
+				miphy_phy->syscfg_reg[SYSCFG_STATUS], &val);
 
 		if ((val & MIPHY_OSC_RDY) != MIPHY_OSC_RDY)
 			cpu_relax();
···
 	int err;
 	struct miphy28lp_dev *miphy_dev = miphy_phy->phydev;
 
-	if (!miphy_phy->syscfg_miphy_ctrl)
+	if (!miphy_phy->syscfg_reg[SYSCFG_CTRL])
 		return -EINVAL;
 
 	err = reset_control_assert(miphy_phy->miphy_rst);
···
 	if (miphy_phy->osc_force_ext)
 		miphy_val |= MIPHY_OSC_FORCE_EXT;
 
-	regmap_update_bits(miphy_dev->regmap, miphy_phy->syscfg_miphy_ctrl,
+	regmap_update_bits(miphy_dev->regmap,
+			   miphy_phy->syscfg_reg[SYSCFG_CTRL],
 			   MIPHY_CTRL_MASK, miphy_val);
 
 	err = reset_control_deassert(miphy_phy->miphy_rst);
···
 	struct miphy28lp_dev *miphy_dev = miphy_phy->phydev;
 	int err, sata_conf = SATA_CTRL_SELECT_SATA;
 
-	if ((!miphy_phy->syscfg_sata) || (!miphy_phy->syscfg_pci)
-		|| (!miphy_phy->base))
+	if ((!miphy_phy->syscfg_reg[SYSCFG_SATA]) ||
+			(!miphy_phy->syscfg_reg[SYSCFG_PCI]) ||
+			(!miphy_phy->base))
 		return -EINVAL;
 
 	dev_info(miphy_dev->dev, "sata-up mode, addr 0x%p\n", miphy_phy->base);
···
 	/* Configure the glue-logic */
 	sata_conf |= ((miphy_phy->sata_gen - SATA_GEN1) << SATA_SPDMODE);
 
-	regmap_update_bits(miphy_dev->regmap, miphy_phy->syscfg_sata,
+	regmap_update_bits(miphy_dev->regmap,
+			   miphy_phy->syscfg_reg[SYSCFG_SATA],
 			   SATA_CTRL_MASK, sata_conf);
 
-	regmap_update_bits(miphy_dev->regmap, miphy_phy->syscfg_pci,
+	regmap_update_bits(miphy_dev->regmap, miphy_phy->syscfg_reg[SYSCFG_PCI],
 			   PCIE_CTRL_MASK, SATA_CTRL_SELECT_PCIE);
 
 	/* MiPHY path and clocking init */
···
 	struct miphy28lp_dev *miphy_dev = miphy_phy->phydev;
 	int err;
 
-	if ((!miphy_phy->syscfg_sata) || (!miphy_phy->syscfg_pci)
+	if ((!miphy_phy->syscfg_reg[SYSCFG_SATA]) ||
+			(!miphy_phy->syscfg_reg[SYSCFG_PCI])
 		|| (!miphy_phy->base) || (!miphy_phy->pipebase))
 		return -EINVAL;
 
 	dev_info(miphy_dev->dev, "pcie-up mode, addr 0x%p\n", miphy_phy->base);
 
 	/* Configure the glue-logic */
-	regmap_update_bits(miphy_dev->regmap, miphy_phy->syscfg_sata,
+	regmap_update_bits(miphy_dev->regmap,
+			   miphy_phy->syscfg_reg[SYSCFG_SATA],
 			   SATA_CTRL_MASK, SATA_CTRL_SELECT_PCIE);
 
-	regmap_update_bits(miphy_dev->regmap, miphy_phy->syscfg_pci,
+	regmap_update_bits(miphy_dev->regmap, miphy_phy->syscfg_reg[SYSCFG_PCI],
 			   PCIE_CTRL_MASK, SYSCFG_PCIE_PCIE_VAL);
 
 	/* MiPHY path and clocking init */
···
 static int miphy28lp_of_probe(struct device_node *np,
 			      struct miphy28lp_phy *miphy_phy)
 {
-	struct resource res;
+	int i;
+	u32 ctrlreg;
 
 	miphy_phy->osc_force_ext =
 		of_property_read_bool(np, "st,osc-force-ext");
···
 	if (!miphy_phy->sata_gen)
 		miphy_phy->sata_gen = SATA_GEN1;
 
-	if (!miphy28lp_get_resource_byname(np, "miphy-ctrl-glue", &res))
-		miphy_phy->syscfg_miphy_ctrl = res.start;
-
-	if (!miphy28lp_get_resource_byname(np, "miphy-status-glue", &res))
-		miphy_phy->syscfg_miphy_status = res.start;
-
-	if (!miphy28lp_get_resource_byname(np, "pcie-glue", &res))
-		miphy_phy->syscfg_pci = res.start;
-
-	if (!miphy28lp_get_resource_byname(np, "sata-glue", &res))
-		miphy_phy->syscfg_sata = res.start;
-
+	for (i = 0; i < SYSCFG_REG_MAX; i++) {
+		if (!of_property_read_u32_index(np, "st,syscfg", i, &ctrlreg))
+			miphy_phy->syscfg_reg[i] = ctrlreg;
+	}
 
 	return 0;
 }