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Date:   Tue, 26 Mar 2019 16:57:27 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 2/3] ARM: davinci: da830-evm: add a fixed regulator for ohci-da8xx

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

Instead of directly using the vbus GPIO we should model it as a fixed
regulator. Add all necessary fix-ups for the regulator to be registered
and configure the vbus GPIO as its enable pin.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 arch/arm/mach-davinci/board-da830-evm.c | 48 +++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index ff097ecfa451..2ae1eff54345 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -29,6 +29,7 @@
 #include <linux/platform_data/spi-davinci.h>
 #include <linux/platform_data/usb-davinci.h>
 #include <linux/platform_data/ti-aemif.h>
+#include <linux/regulator/fixed.h>
 #include <linux/regulator/machine.h>
 #include <linux/nvmem-provider.h>
 
@@ -53,14 +54,48 @@ static const short da830_evm_usb11_pins[] = {
 	-1
 };
 
-static struct gpiod_lookup_table da830_evm_usb_gpio_lookup = {
+static struct regulator_consumer_supply da830_evm_usb_supplies[] = {
+	REGULATOR_SUPPLY("vbus", NULL),
+};
+
+static struct regulator_init_data da830_evm_usb_vbus_data = {
+	.consumer_supplies	= da830_evm_usb_supplies,
+	.num_consumer_supplies	= ARRAY_SIZE(da830_evm_usb_supplies),
+};
+
+static struct fixed_voltage_config da830_evm_usb_vbus = {
+	.supply_name		= "vbus",
+	.microvolts		= 33000000,
+	.init_data		= &da830_evm_usb_vbus_data,
+};
+
+static struct platform_device da830_evm_usb_vbus_device = {
+	.name		= "reg-fixed-voltage",
+	.id		= 1,
+	.dev		= {
+		.platform_data = &da830_evm_usb_vbus,
+	},
+};
+
+static struct gpiod_lookup_table da830_evm_usb_oc_gpio_lookup = {
 	.dev_id		= "ohci-da8xx",
 	.table = {
-		GPIO_LOOKUP("davinci_gpio", ON_BD_USB_DRV, "vbus", 0),
 		GPIO_LOOKUP("davinci_gpio", ON_BD_USB_OVC, "oc", 0),
 	},
 };
 
+static struct gpiod_lookup_table da830_evm_usb_vbus_gpio_lookup = {
+	.dev_id		= "reg-fixed-voltage.1",
+	.table = {
+		GPIO_LOOKUP("davinci_gpio", ON_BD_USB_DRV, "vbus", 0),
+	},
+};
+
+static struct gpiod_lookup_table *da830_evm_usb_gpio_lookups[] = {
+	&da830_evm_usb_oc_gpio_lookup,
+	&da830_evm_usb_vbus_gpio_lookup,
+};
+
 static struct da8xx_ohci_root_hub da830_evm_usb11_pdata = {
 	/* TPS2065 switch @ 5V */
 	.potpgt		= (3 + 1) / 2,	/* 3 ms max */
@@ -75,6 +110,9 @@ static __init void da830_evm_usb_init(void)
 		pr_warn("%s: USB PHY CLK registration failed: %d\n",
 			__func__, ret);
 
+	gpiod_add_lookup_tables(da830_evm_usb_gpio_lookups,
+				ARRAY_SIZE(da830_evm_usb_gpio_lookups));
+
 	ret = da8xx_register_usb_phy();
 	if (ret)
 		pr_warn("%s: USB PHY registration failed: %d\n",
@@ -100,7 +138,11 @@ static __init void da830_evm_usb_init(void)
 		return;
 	}
 
-	gpiod_add_lookup_table(&da830_evm_usb_gpio_lookup);
+	ret = platform_device_register(&da830_evm_usb_vbus_device);
+	if (ret) {
+		pr_warn("%s: Unable to register the vbus supply\n", __func__);
+		return;
+	}
 
 	ret = da8xx_register_usb11(&da830_evm_usb11_pdata);
 	if (ret)
-- 
2.20.1

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