i2c-cht-wc: Add device-properties for fusb302 integration

Add device-properties to make the bq24292i charger connected to
the bus get its input-current-limit from the fusb302 Type-C port
controller which is used on boards with the cht-wc PMIC,
as well as regulator_init_data for the 5V boost converter on
the bq24292i.

Since this means we now hook-up the bq24292i to the fusb302 Type-C port
controller add a check for the ACPI device which instantiates the fusb302.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/Kconfig

@@ -198,6 +198,11 @@ config I2C_CHT_WC
 	  SMBus controller found in the Intel Cherry Trail Whiskey Cove PMIC
 	  found on some Intel Cherry Trail systems.
 
+	  Note this controller is hooked up to a TI bq24292i charger-IC,
+	  combined with a FUSB302 Type-C port-controller as such it is advised
+	  to also select CONFIG_CHARGER_BQ24190=m and CONFIG_TYPEC_FUSB302=m
+	  (the fusb302 driver currently is in drivers/staging).
+
 config I2C_NFORCE2
 	tristate "Nvidia nForce2, nForce3 and nForce4"
 	depends on PCI

drivers/i2c/busses/i2c-cht-wc.c

@@ -16,6 +16,7 @@
  * GNU General Public License for more details.
  */
 
+#include <linux/acpi.h>
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
@@ -25,6 +26,7 @@
 #include <linux/mfd/intel_soc_pmic.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/power/bq24190_charger.h>
 #include <linux/slab.h>
 
 #define CHT_WC_I2C_CTRL			0x5e24
@@ -232,13 +234,35 @@ static const struct irq_chip cht_wc_i2c_irq_chip = {
 	.name			= "cht_wc_ext_chrg_irq_chip",
 };
 
+static const char * const bq24190_suppliers[] = { "fusb302-typec-source" };
+
 static const struct property_entry bq24190_props[] = {
-	PROPERTY_ENTRY_STRING("extcon-name", "cht_wcove_pwrsrc"),
+	PROPERTY_ENTRY_STRING_ARRAY("supplied-from", bq24190_suppliers),
 	PROPERTY_ENTRY_BOOL("omit-battery-class"),
 	PROPERTY_ENTRY_BOOL("disable-reset"),
 	{ }
 };
 
+static struct regulator_consumer_supply fusb302_consumer = {
+	.supply = "vbus",
+	/* Must match fusb302 dev_name in intel_cht_int33fe.c */
+	.dev_name = "i2c-fusb302",
+};
+
+static const struct regulator_init_data bq24190_vbus_init_data = {
+	.constraints = {
+		/* The name is used in intel_cht_int33fe.c do not change. */
+		.name = "cht_wc_usb_typec_vbus",
+		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
+	},
+	.consumer_supplies = &fusb302_consumer,
+	.num_consumer_supplies = 1,
+};
+
+static struct bq24190_platform_data bq24190_pdata = {
+	.regulator_init_data = &bq24190_vbus_init_data,
+};
+
 static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev)
 {
 	struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
@@ -246,7 +270,9 @@ static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev)
 	struct i2c_board_info board_info = {
 		.type = "bq24190",
 		.addr = 0x6b,
+		.dev_name = "bq24190",
 		.properties = bq24190_props,
+		.platform_data = &bq24190_pdata,
 	};
 	int ret, reg, irq;
 
@@ -314,11 +340,21 @@ static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev)
 	if (ret)
 		goto remove_irq_domain;
 
-	board_info.irq = adap->client_irq;
-	adap->client = i2c_new_device(&adap->adapter, &board_info);
-	if (!adap->client) {
-		ret = -ENOMEM;
-		goto del_adapter;
+	/*
+	 * Normally the Whiskey Cove PMIC is paired with a TI bq24292i charger,
+	 * connected to this i2c bus, and a max17047 fuel-gauge and a fusb302
+	 * USB Type-C controller connected to another i2c bus. In this setup
+	 * the max17047 and fusb302 devices are enumerated through an INT33FE
+	 * ACPI device. If this device is present register an i2c-client for
+	 * the TI bq24292i charger.
+	 */
+	if (acpi_dev_present("INT33FE", NULL, -1)) {
+		board_info.irq = adap->client_irq;
+		adap->client = i2c_new_device(&adap->adapter, &board_info);
+		if (!adap->client) {
+			ret = -ENOMEM;
+			goto del_adapter;
+		}
 	}
 
 	platform_set_drvdata(pdev, adap);
@@ -335,7 +371,8 @@ static int cht_wc_i2c_adap_i2c_remove(struct platform_device *pdev)
 {
 	struct cht_wc_i2c_adap *adap = platform_get_drvdata(pdev);
 
-	i2c_unregister_device(adap->client);
+	if (adap->client)
+		i2c_unregister_device(adap->client);
 	i2c_del_adapter(&adap->adapter);
 	irq_domain_remove(adap->irq_domain);