[PATCH 0/3] [PART 2/4] ARM: davinci: OHCI: Use a regulator instead of callbacks

[PATCH 0/3] [PART 2/4] ARM: davinci: OHCI: Use a regulator instead of callbacks

[Axel Haslam]

With the ultimate goal to able to probe the ohci driver form DT,
convert users of OHCI pdata to use a regulator instead of
passing platform function pointers. This will help to remove the
platform callbacks in a future series.

DEPENDENCIES:
1. [PATCH 0/3] fix ohci phy name
https://lkml.org/lkml/2016/11/2/208
2. [PATCH/RFC v2 0/3] regulator: handling of error conditions for usb drivers
https://lkml.org/lkml/2016/11/3/188
3. [PATCH v4 0/3] [PART 1/4] USB: ohci-da8xx: Allow a regulator for VBUS and over current

A branch with all the dependencies can be found here:
https://github.com/axelhaslamx/linux-axel/commits/ohci-da8xx-dt-v4

Axel Haslam (3):
  ARM: davinci: da830: Handle vbus with a regulator
  ARM: davinci: hawk: Remove vbus and over current gpios
  ARM: davinci: remove ohci platform usage

 arch/arm/mach-davinci/board-da830-evm.c     | 108 ++++++++++------------------
 arch/arm/mach-davinci/board-omapl138-hawk.c |  99 ++-----------------------
 arch/arm/mach-davinci/include/mach/da8xx.h  |   2 +-
 arch/arm/mach-davinci/usb-da8xx.c           |   3 +-
 4 files changed, 44 insertions(+), 168 deletions(-)

-- 
2.10.1

[PATCH 1/3] ARM: davinci: da830: Handle vbus with a regulator

[Axel Haslam]

The usb driver can now take a regulator instead of the platform
callbacks for vbus handling. Lets use a regulator so we can remove
the callbacks in a later patch.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
---
 arch/arm/mach-davinci/board-da830-evm.c | 108 +++++++++++---------------------
 1 file changed, 38 insertions(+), 70 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 5db0901..16a401a 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -14,6 +14,7 @@
 #include <linux/console.h>
 #include <linux/interrupt.h>
 #include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/i2c/pcf857x.h>
@@ -28,6 +29,7 @@
 #include <linux/platform_data/spi-davinci.h>
 #include <linux/platform_data/usb-davinci.h>
 #include <linux/regulator/machine.h>
+#include <linux/regulator/fixed.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -38,72 +40,48 @@
 #include <mach/da8xx.h>
 
 #define DA830_EVM_PHY_ID		""
-/*
- * USB1 VBUS is controlled by GPIO1[15], over-current is reported on GPIO2[4].
- */
-#define ON_BD_USB_DRV	GPIO_TO_PIN(1, 15)
-#define ON_BD_USB_OVC	GPIO_TO_PIN(2, 4)
 
 static const short da830_evm_usb11_pins[] = {
 	DA830_GPIO1_15, DA830_GPIO2_4,
 	-1
 };
 
-static da8xx_ocic_handler_t da830_evm_usb_ocic_handler;
-
-static int da830_evm_usb_set_power(unsigned port, int on)
-{
-	gpio_set_value(ON_BD_USB_DRV, on);
-	return 0;
-}
+static struct regulator_consumer_supply usb_ohci_consumer_supply =
+	REGULATOR_SUPPLY("vbus", "ohci-da8xx");
 
-static int da830_evm_usb_get_power(unsigned port)
-{
-	return gpio_get_value(ON_BD_USB_DRV);
-}
-
-static int da830_evm_usb_get_oci(unsigned port)
-{
-	return !gpio_get_value(ON_BD_USB_OVC);
-}
-
-static irqreturn_t da830_evm_usb_ocic_irq(int, void *);
-
-static int da830_evm_usb_ocic_notify(da8xx_ocic_handler_t handler)
-{
-	int irq 	= gpio_to_irq(ON_BD_USB_OVC);
-	int error	= 0;
-
-	if (handler != NULL) {
-		da830_evm_usb_ocic_handler = handler;
-
-		error = request_irq(irq, da830_evm_usb_ocic_irq,
-				    IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
-				    "OHCI over-current indicator", NULL);
-		if (error)
-			pr_err("%s: could not request IRQ to watch over-current indicator changes\n",
-			       __func__);
-	} else
-		free_irq(irq, NULL);
-
-	return error;
-}
+static struct regulator_init_data usb_ohci_initdata = {
+	.consumer_supplies = &usb_ohci_consumer_supply,
+	.num_consumer_supplies = 1,
+	.constraints = {
+		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+	},
+};
 
-static struct da8xx_ohci_root_hub da830_evm_usb11_pdata = {
-	.set_power	= da830_evm_usb_set_power,
-	.get_power	= da830_evm_usb_get_power,
-	.get_oci	= da830_evm_usb_get_oci,
-	.ocic_notify	= da830_evm_usb_ocic_notify,
+static struct fixed_voltage_config usb_ohci_config = {
+	.supply_name		= "vbus",
+	.microvolts		= 5000000,
+	.gpio			= GPIO_TO_PIN(1, 15),
+	.enable_high		= 1,
+	.enabled_at_boot	= 0,
+	.init_data		= &usb_ohci_initdata,
+};
 
-	/* TPS2065 switch @ 5V */
-	.potpgt		= (3 + 1) / 2,	/* 3 ms max */
+static struct platform_device da8xx_usb11_regulator = {
+	.name	= "reg-fixed-voltage",
+	.id	= 0,
+	.dev	= {
+		.platform_data = &usb_ohci_config,
+	},
 };
 
-static irqreturn_t da830_evm_usb_ocic_irq(int irq, void *dev_id)
-{
-	da830_evm_usb_ocic_handler(&da830_evm_usb11_pdata, 1);
-	return IRQ_HANDLED;
-}
+static struct gpiod_lookup_table usb11_gpios_table = {
+	.dev_id = "reg-fixed-voltage.0",
+	.table = {
+		/* gpio chip 1 contains gpio range 32-63 */
+		GPIO_LOOKUP("davinci_gpio.1", 4, "over-current",
+				GPIO_ACTIVE_LOW),
+	},
+};
 
 static __init void da830_evm_usb_init(void)
 {
@@ -145,23 +123,13 @@ static __init void da830_evm_usb_init(void)
 		return;
 	}
 
-	ret = gpio_request(ON_BD_USB_DRV, "ON_BD_USB_DRV");
-	if (ret) {
-		pr_err("%s: failed to request GPIO for USB 1.1 port power control: %d\n",
-		       __func__, ret);
-		return;
-	}
-	gpio_direction_output(ON_BD_USB_DRV, 0);
+	gpiod_add_lookup_table(&usb11_gpios_table);
 
-	ret = gpio_request(ON_BD_USB_OVC, "ON_BD_USB_OVC");
-	if (ret) {
-		pr_err("%s: failed to request GPIO for USB 1.1 port over-current indicator: %d\n",
-		       __func__, ret);
-		return;
-	}
-	gpio_direction_input(ON_BD_USB_OVC);
+	ret = platform_device_register(&da8xx_usb11_regulator);
+	if (ret)
+		pr_warn("fail to add ohci regulator\n");
 
-	ret = da8xx_register_usb11(&da830_evm_usb11_pdata);
+	ret = da8xx_register_usb11(NULL);
 	if (ret)
 		pr_warn("%s: USB 1.1 registration failed: %d\n", __func__, ret);
 }
-- 
2.10.1

[PATCH 2/3] ARM: davinci: hawk: Remove vbus and over current gpios

[Axel Haslam]

The hawk board VBUS is fixed to a 5v source, and the over
current pin is actually not connected to the SoC.

Do not reseve these gpios for OHCI as they are not related
to usb.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
---
 arch/arm/mach-davinci/board-omapl138-hawk.c | 99 ++---------------------------
 1 file changed, 4 insertions(+), 95 deletions(-)

diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index a4e8726..a252404 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
@@ -28,9 +28,6 @@
 #define DA850_HAWK_MMCSD_CD_PIN		GPIO_TO_PIN(3, 12)
 #define DA850_HAWK_MMCSD_WP_PIN		GPIO_TO_PIN(3, 13)
 
-#define DA850_USB1_VBUS_PIN		GPIO_TO_PIN(2, 4)
-#define DA850_USB1_OC_PIN		GPIO_TO_PIN(6, 13)
-
 static short omapl138_hawk_mii_pins[] __initdata = {
 	DA850_MII_TXEN, DA850_MII_TXCLK, DA850_MII_COL, DA850_MII_TXD_3,
 	DA850_MII_TXD_2, DA850_MII_TXD_1, DA850_MII_TXD_0, DA850_MII_RXER,
@@ -181,76 +178,10 @@ static __init void omapl138_hawk_mmc_init(void)
 	gpio_free(DA850_HAWK_MMCSD_CD_PIN);
 }
 
-static irqreturn_t omapl138_hawk_usb_ocic_irq(int irq, void *dev_id);
-static da8xx_ocic_handler_t hawk_usb_ocic_handler;
-
-static const short da850_hawk_usb11_pins[] = {
-	DA850_GPIO2_4, DA850_GPIO6_13,
-	-1
-};
-
-static int hawk_usb_set_power(unsigned port, int on)
-{
-	gpio_set_value(DA850_USB1_VBUS_PIN, on);
-	return 0;
-}
-
-static int hawk_usb_get_power(unsigned port)
-{
-	return gpio_get_value(DA850_USB1_VBUS_PIN);
-}
-
-static int hawk_usb_get_oci(unsigned port)
-{
-	return !gpio_get_value(DA850_USB1_OC_PIN);
-}
-
-static int hawk_usb_ocic_notify(da8xx_ocic_handler_t handler)
-{
-	int irq         = gpio_to_irq(DA850_USB1_OC_PIN);
-	int error       = 0;
-
-	if (handler != NULL) {
-		hawk_usb_ocic_handler = handler;
-
-		error = request_irq(irq, omapl138_hawk_usb_ocic_irq,
-					IRQF_TRIGGER_RISING |
-					IRQF_TRIGGER_FALLING,
-					"OHCI over-current indicator", NULL);
-		if (error)
-			pr_err("%s: could not request IRQ to watch "
-				"over-current indicator changes\n", __func__);
-	} else {
-		free_irq(irq, NULL);
-	}
-	return error;
-}
-
-static struct da8xx_ohci_root_hub omapl138_hawk_usb11_pdata = {
-	.set_power      = hawk_usb_set_power,
-	.get_power      = hawk_usb_get_power,
-	.get_oci        = hawk_usb_get_oci,
-	.ocic_notify    = hawk_usb_ocic_notify,
-	/* TPS2087 switch @ 5V */
-	.potpgt         = (3 + 1) / 2,  /* 3 ms max */
-};
-
-static irqreturn_t omapl138_hawk_usb_ocic_irq(int irq, void *dev_id)
-{
-	hawk_usb_ocic_handler(&omapl138_hawk_usb11_pdata, 1);
-	return IRQ_HANDLED;
-}
-
 static __init void omapl138_hawk_usb_init(void)
 {
 	int ret;
 
-	ret = davinci_cfg_reg_list(da850_hawk_usb11_pins);
-	if (ret) {
-		pr_warn("%s: USB 1.1 PinMux setup failed: %d\n", __func__, ret);
-		return;
-	}
-
 	ret = da8xx_register_usb20_phy_clk(false);
 	if (ret)
 		pr_warn("%s: USB 2.0 PHY CLK registration failed: %d\n",
@@ -266,34 +197,12 @@ static __init void omapl138_hawk_usb_init(void)
 		pr_warn("%s: USB PHY registration failed: %d\n",
 			__func__, ret);
 
-	ret = gpio_request_one(DA850_USB1_VBUS_PIN,
-			GPIOF_DIR_OUT, "USB1 VBUS");
-	if (ret < 0) {
-		pr_err("%s: failed to request GPIO for USB 1.1 port "
-			"power control: %d\n", __func__, ret);
-		return;
-	}
-
-	ret = gpio_request_one(DA850_USB1_OC_PIN,
-			GPIOF_DIR_IN, "USB1 OC");
-	if (ret < 0) {
-		pr_err("%s: failed to request GPIO for USB 1.1 port "
-			"over-current indicator: %d\n", __func__, ret);
-		goto usb11_setup_oc_fail;
-	}
-
-	ret = da8xx_register_usb11(&omapl138_hawk_usb11_pdata);
-	if (ret) {
-		pr_warn("%s: USB 1.1 registration failed: %d\n", __func__, ret);
-		goto usb11_setup_fail;
-	}
+	ret = da8xx_register_usb11(NULL);
+	if (ret)
+		pr_warn("%s: USB 1.1 registration failed: %d\n",
+			__func__, ret);
 
 	return;
-
-usb11_setup_fail:
-	gpio_free(DA850_USB1_OC_PIN);
-usb11_setup_oc_fail:
-	gpio_free(DA850_USB1_VBUS_PIN);
 }
 
 static __init void omapl138_hawk_init(void)
-- 
2.10.1

[PATCH 3/3] ARM: davinci: remove ohci platform usage

[Axel Haslam]

As all users of ohci platform data have been converted
to use a regulator, we dont need to pass platform
data to register the ohci device anymore.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
---
 arch/arm/mach-davinci/board-da830-evm.c     | 2 +-
 arch/arm/mach-davinci/board-omapl138-hawk.c | 2 +-
 arch/arm/mach-davinci/include/mach/da8xx.h  | 2 +-
 arch/arm/mach-davinci/usb-da8xx.c           | 3 +--
 4 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 16a401a..cb67885 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -129,7 +129,7 @@ static __init void da830_evm_usb_init(void)
 	if (ret)
 		pr_warn("fail to add ohci regulator\n");
 
-	ret = da8xx_register_usb11(NULL);
+	ret = da8xx_register_usb11();
 	if (ret)
 		pr_warn("%s: USB 1.1 registration failed: %d\n", __func__, ret);
 }
diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index a252404..cbe7324 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
@@ -197,7 +197,7 @@ static __init void omapl138_hawk_usb_init(void)
 		pr_warn("%s: USB PHY registration failed: %d\n",
 			__func__, ret);
 
-	ret = da8xx_register_usb11(NULL);
+	ret = da8xx_register_usb11();
 	if (ret)
 		pr_warn("%s: USB 1.1 registration failed: %d\n",
 			__func__, ret);
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 43322be..6096402 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -91,7 +91,7 @@ int da8xx_register_spi_bus(int instance, unsigned num_chipselect);
 int da8xx_register_watchdog(void);
 int da8xx_register_usb_phy(void);
 int da8xx_register_usb20(unsigned mA, unsigned potpgt);
-int da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata);
+int da8xx_register_usb11(void);
 int da8xx_register_usb_refclkin(int rate);
 int da8xx_register_usb20_phy_clk(bool use_usb_refclkin);
 int da8xx_register_usb11_phy_clk(bool use_usb_refclkin);
diff --git a/arch/arm/mach-davinci/usb-da8xx.c b/arch/arm/mach-davinci/usb-da8xx.c
index c6feecf..4ea91bb 100644
--- a/arch/arm/mach-davinci/usb-da8xx.c
+++ b/arch/arm/mach-davinci/usb-da8xx.c
@@ -119,9 +119,8 @@ static struct platform_device da8xx_usb11_device = {
 	.resource	= da8xx_usb11_resources,
 };
 
-int __init da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata)
+int __init da8xx_register_usb11(void)
 {
-	da8xx_usb11_device.dev.platform_data = pdata;
 	return platform_device_register(&da8xx_usb11_device);
 }
 
-- 
2.10.1