ARM: dt: tegra: harmony: add regulators

Harmony uses a TPS6586x regulator. Instantiate this, and hook up a
couple of fixed GPIO-controlled regulators too.

Based on Ventana regulator patch by Stephen Warren <swarren@nvidia.com>
and converted to Harmony.

swarren made the following changes:
* Added ldo0 regulator configuration to device tree, and updated
  board-harmony-pcie.c for the new regulator name.
* Fixed vdd_1v05's voltage from 10.5V to 1.05V.
* Modified board-harmony-pcie.c to obtain the en_vdd_1v05 GPIO number at
  run-time from device tree instead of hard-coding it.
* Removed board-harmony{-power.c,.h} now that they're unused.
* Disabled vdd_1v05 regulator; the code in board-harmony-pcie.c hijacks
  this GPIO for now. This will be fixed when the PCIe driver is re-
  written as a driver. The code can't regulator_get("vdd_1v05") right
  now, because the vdd_1v05 regulator's probe gets deferred due to its
  supply being the PMIC, which gets probed after the regulator the first
  time around, and this dependency is only resolved by repeated probing,
  which happens when deferred_probe_initcall() is called, which happens
  in a late initcall, whose runtime order relative to harmony_pcie_init()
  is undefined, since that's also called from a late initcall.
* Removed unused harmony_pcie_initcall().

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

1 files changed, 30 insertions, 19 deletions

diff --git a/arch/arm/mach-tegra/board-harmony-pcie.c b/arch/arm/mach-tegra/board-harmony-pcie.c
index e8c3fda9bec2..3cdc1bb8254c 100644
--- a/arch/arm/mach-tegra/board-harmony-pcie.c
+++ b/arch/arm/mach-tegra/board-harmony-pcie.c
@@ -18,35 +18,57 @@
 #include <linux/kernel.h>
 #include <linux/gpio.h>
 #include <linux/err.h>
+#include <linux/of_gpio.h>
 #include <linux/regulator/consumer.h>
 
 #include <asm/mach-types.h>
 
 #include "board.h"
-#include "board-harmony.h"
 
 #ifdef CONFIG_TEGRA_PCI
 
 int __init harmony_pcie_init(void)
 {
+	struct device_node *np;
+	int en_vdd_1v05;
 	struct regulator *regulator = NULL;
 	int err;
 
-	err = gpio_request(TEGRA_GPIO_EN_VDD_1V05_GPIO, "EN_VDD_1V05");
-	if (err)
+	np = of_find_node_by_path("/regulators/regulator@3");
+	if (!np) {
+		pr_err("%s: of_find_node_by_path failed\n", __func__);
+		return -ENODEV;
+	}
+
+	en_vdd_1v05 = of_get_named_gpio(np, "gpio", 0);
+	if (en_vdd_1v05 < 0) {
+		pr_err("%s: of_get_named_gpio failed: %d\n", __func__,
+		       en_vdd_1v05);
+		return en_vdd_1v05;
+	}
+
+	err = gpio_request(en_vdd_1v05, "EN_VDD_1V05");
+	if (err) {
+		pr_err("%s: gpio_request failed: %d\n", __func__, err);
 		return err;
+	}
 
-	gpio_direction_output(TEGRA_GPIO_EN_VDD_1V05_GPIO, 1);
+	gpio_direction_output(en_vdd_1v05, 1);
 
-	regulator = regulator_get(NULL, "pex_clk");
-	if (IS_ERR_OR_NULL(regulator))
+	regulator = regulator_get(NULL, "vdd_ldo0,vddio_pex_clk");
+	if (IS_ERR_OR_NULL(regulator)) {
+		pr_err("%s: regulator_get failed: %d\n", __func__,
+		       (int)PTR_ERR(regulator));
 		goto err_reg;
+	}
 
 	regulator_enable(regulator);
 
 	err = tegra_pcie_init(true, true);
-	if (err)
+	if (err) {
+		pr_err("%s: tegra_pcie_init failed: %d\n", __func__, err);
 		goto err_pcie;
+	}
 
 	return 0;
 
@@ -54,20 +76,9 @@ err_pcie:
 	regulator_disable(regulator);
 	regulator_put(regulator);
 err_reg:
-	gpio_free(TEGRA_GPIO_EN_VDD_1V05_GPIO);
+	gpio_free(en_vdd_1v05);
 
 	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_initcall);
-
 #endif