ARM: tegra: harmony: init regulators, PCIe when booting from DT

There currently aren't bindings for the Tegra PCIe controller. Work on
this is in progress, but not yet complete. Manually initialize PCIe when
booting from device tree, in order to bring DT support to the same
feature level as board files, which will in turn allow board files to be
deprecated.

PCIe on Harmony requires various regulators to be registered and enabled
before initializing the PCIe controller. Note that since the I2C
controllers are instantiated from DT, we must use i2c_new_device() to
register the PMU rather than i2c_register_board_info().
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/mach-tegra/board-dt-tegra20.c

@@ -109,6 +109,23 @@ static void __init trimslice_init(void)
 }
 #endif
 
+#ifdef CONFIG_MACH_HARMONY
+static void __init harmony_init(void)
+{
+	int ret;
+
+	ret = harmony_regulator_init();
+	if (ret) {
+		pr_err("harmony_regulator_init() failed: %d\n", ret);
+		return;
+	}
+
+	ret = harmony_pcie_init();
+	if (ret)
+		pr_err("harmony_pcie_init() failed: %d\n", ret);
+}
+#endif
+
 static struct {
 	char *machine;
 	void (*init)(void);
@@ -116,6 +133,9 @@ static struct {
 #ifdef CONFIG_MACH_TRIMSLICE
 	{ "compulab,trimslice", trimslice_init },
 #endif
+#ifdef CONFIG_MACH_HARMONY
+	{ "nvidia,harmony", harmony_init },
+#endif
 };
 
 static void __init tegra_dt_init_late(void)

arch/arm/mach-tegra/board-harmony-pcie.c

@@ -27,14 +27,11 @@
 
 #ifdef CONFIG_TEGRA_PCI
 
-static int __init harmony_pcie_init(void)
+int __init harmony_pcie_init(void)
 {
 	struct regulator *regulator = NULL;
 	int err;
 
-	if (!machine_is_harmony())
-		return 0;
-
 	err = gpio_request(TEGRA_GPIO_EN_VDD_1V05_GPIO, "EN_VDD_1V05");
 	if (err)
 		return err;
@@ -62,7 +59,15 @@ static int __init harmony_pcie_init(void)
 	return err;
 }
 
+static int __init harmony_pcie_initcall(void)
+{
+	if (!machine_is_harmony())
+		return 0;
+
+	return harmony_pcie_init();
+}
+
 /* PCI should be initialized after I2C, mfd and regulators */
-subsys_initcall_sync(harmony_pcie_init);
+subsys_initcall_sync(harmony_pcie_initcall);
 
 #endif

arch/arm/mach-tegra/board-harmony-power.c

@@ -20,6 +20,10 @@
 #include <linux/gpio.h>
 #include <linux/regulator/machine.h>
 #include <linux/mfd/tps6586x.h>
+#include <linux/of.h>
+#include <linux/of_i2c.h>
+
+#include <asm/mach-types.h>
 
 #include <mach/irqs.h>
 
@@ -110,7 +114,26 @@ static struct i2c_board_info __initdata harmony_regulators[] = {
 
 int __init harmony_regulator_init(void)
 {
-	i2c_register_board_info(3, harmony_regulators, 1);
+	if (machine_is_harmony()) {
+		i2c_register_board_info(3, harmony_regulators, 1);
+	} else { /* Harmony, booted using device tree */
+		struct device_node *np;
+		struct i2c_adapter *adapter;
+
+		np = of_find_node_by_path("/i2c@7000d000");
+		if (np == NULL) {
+			pr_err("Could not find device_node for DVC I2C\n");
+			return -ENODEV;
+		}
+
+		adapter = of_find_i2c_adapter_by_node(np);
+		if (!adapter) {
+			pr_err("Could not find i2c_adapter for DVC I2C\n");
+			return -ENODEV;
+		}
+
+		i2c_new_device(adapter, harmony_regulators);
+	}
 
 	return 0;
 }

arch/arm/mach-tegra/board.h

@@ -46,5 +46,12 @@ int __init tegra_powergate_debugfs_init(void);
 static inline int tegra_powergate_debugfs_init(void) { return 0; }
 #endif
 
+int __init harmony_regulator_init(void);
+#ifdef CONFIG_TEGRA_PCI
+int __init harmony_pcie_init(void);
+#else
+static inline int harmony_pcie_init(void) { return 0; }
+#endif
+
 extern struct sys_timer tegra_timer;
 #endif