regulator: fixed/gpio: Pull inversion/OD into gpiolib

This pushes the handling of inversion semantics and open drain
settings to the GPIO descriptor and gpiolib. All affected board
files are also augmented.

This is especially nice since we don't have to have any
confusing flags passed around to the left and right littering
the fixed and GPIO regulator drivers and the regulator core.
It is all just very straight-forward: the core asks the GPIO
line to be asserted or deasserted and gpiolib deals with the
rest depending on how the platform is configured: if the line
is active low, it deals with that, if the line is open drain,
it deals with that too.

Cc: Alexander Shiyan <[e-mail]> # i.MX boards user
Cc: Haojian Zhuang <[e-mail]> # MMP2 maintainer
Cc: Aaro Koskinen <[e-mail]> # OMAP1 maintainer
Cc: Tony Lindgren <[e-mail]> # OMAP1,2,3 maintainer
Cc: Mike Rapoport <[e-mail]> # EM-X270 maintainer
Cc: Robert Jarzmik <[e-mail]> # EZX maintainer
Cc: Philipp Zabel <[e-mail]> # Magician maintainer
Cc: Petr Cvek <[e-mail]> # Magician
Cc: Robert Jarzmik <[e-mail]> # PXA
Cc: Paul Parsons <[e-mail]> # hx4700
Cc: Daniel Mack <[e-mail]> # Raumfeld maintainer
Cc: Marc Zyngier <[e-mail]> # Zeus maintainer
Cc: Geert Uytterhoeven <[e-mail]> # SuperH pinctrl/GPIO maintainer
Cc: Russell King <[e-mail]> # SA1100
Tested-by: Marek Szyprowski <[e-mail]>
Tested-by: Janusz Krzysztofik <[e-mail]> #OMAP1 Amstrad Delta
Signed-off-by: Linus Walleij <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

arch/arm/mach-imx/mach-mx21ads.c

···
 static struct fixed_voltage_config mx21ads_lcd_regulator_pdata = {
 	.supply_name	= "LCD",
 	.microvolts	= 3300000,
-	.enable_high	= 1,
 	.init_data	= &mx21ads_lcd_regulator_init_data,
 };
 

arch/arm/mach-imx/mach-mx27ads.c

···
 static struct gpiod_lookup_table mx27ads_lcd_regulator_gpiod_table = {
 	.dev_id = "reg-fixed-voltage.0", /* Let's hope ID 0 is what we get */
 	.table = {
-		GPIO_LOOKUP("LCD", 0, NULL, GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP("LCD", 0, NULL, GPIO_ACTIVE_LOW),
 		{ },
 	},
 };

arch/arm/mach-mmp/brownstone.c

···
 static struct fixed_voltage_config brownstone_v_5vp = {
 	.supply_name		= "v_5vp",
 	.microvolts		= 5000000,
-	.enable_high		= 1,
 	.enabled_at_boot	= 1,
 	.init_data		= &brownstone_v_5vp_data,
 };

arch/arm/mach-omap1/board-ams-delta.c

···
 	.supply_name		= "modem_nreset",
 	.microvolts		= 3300000,
 	.startup_delay		= 25000,
-	.enable_high		= 1,
 	.enabled_at_boot	= 1,
 	.init_data		= &modem_nreset_data,
 };
···
 static struct fixed_voltage_config keybrd_pwr_config = {
 	.supply_name		= "keybrd_pwr",
 	.microvolts		= 5000000,
-	.enable_high		= 1,
 	.init_data		= &keybrd_pwr_initdata,
 };
 

arch/arm/mach-omap2/pdata-quirks.c

···
 	.supply_name		= "vwlan",
 	.microvolts		= 1800000, /* 1.8V */
 	.startup_delay		= 50000, /* 50ms */
-	.enable_high		= 1,
 	.init_data		= &pandora_vmmc3,
 };
 

arch/arm/mach-pxa/em-x270.c

···
 	.supply_name		= "camera_vdd",
 	.input_supply		= "vcc cam",
 	.microvolts		= 2800000,
-	.enable_high		= 0,
 	.init_data		= &camera_dummy_initdata,
 };
 

arch/arm/mach-pxa/ezx.c

···
 static struct fixed_voltage_config camera_regulator_config = {
 	.supply_name		= "camera_vdd",
 	.microvolts		= 2800000,
-	.enable_high		= 0,
 	.init_data		= &camera_regulator_initdata,
 };
 
···
 	.dev_id = "reg-fixed-voltage.1",
 	.table = {
 		GPIO_LOOKUP("gpio-pxa", GPIO50_nCAM_EN,
-			    NULL, GPIO_ACTIVE_HIGH),
+			    NULL, GPIO_ACTIVE_LOW),
 		{ },
 	},
 };

arch/arm/mach-pxa/raumfeld.c

···
 static struct fixed_voltage_config audio_va_config = {
 	.supply_name		= "audio_va",
 	.microvolts		= 5000000,
-	.enable_high		= 1,
 	.enabled_at_boot	= 0,
 	.init_data		= &audio_va_initdata,
 };

arch/arm/mach-pxa/zeus.c

···
 	.dev_id = "reg-fixed-voltage.0",
 	.table = {
 		GPIO_LOOKUP("gpio-pxa", ZEUS_CAN_SHDN_GPIO,
-			    NULL, GPIO_ACTIVE_HIGH),
+			    NULL, GPIO_ACTIVE_LOW),
 		{ },
 	},
 };
···
 static struct fixed_voltage_config zeus_ohci_regulator_config = {
 	.supply_name		= "vbus2",
 	.microvolts		= 5000000, /* 5.0V */
-	.enable_high		= 1,
 	.startup_delay		= 0,
 	.init_data		= &zeus_ohci_regulator_data,
 };

arch/arm/mach-sa1100/assabet.c

···
 static struct fixed_voltage_config assabet_cf_vcc_pdata __initdata = {
 	.supply_name = "cf-power",
 	.microvolts = 3300000,
-	.enable_high = 1,
 };
 
 static struct gpiod_lookup_table assabet_cf_vcc_gpio_table = {

arch/sh/boards/mach-ecovec24/setup.c

···
 static struct fixed_voltage_config cn12_power_info = {
 	.supply_name = "CN12 SD/MMC Vdd",
 	.microvolts = 3300000,
-	.enable_high = 1,
 	.init_data = &cn12_power_init_data,
 };
 
···
 static struct fixed_voltage_config sdhi0_power_info = {
 	.supply_name = "CN11 SD/MMC Vdd",
 	.microvolts = 3300000,
-	.enable_high = 1,
 	.init_data = &sdhi0_power_init_data,
 };
 

arch/x86/platform/intel-mid/device_libs/platform_bcm43xx.c

···
 	 */
 	.microvolts		= 2000000,		/* 1.8V */
 	.startup_delay		= 250 * 1000,		/* 250ms */
-	.enable_high		= 1,			/* active high */
 	.enabled_at_boot	= 0,			/* disabled at boot */
 	.init_data		= &bcm43xx_vmmc_data,
 };

drivers/regulator/core.c

···
 	struct gpio_desc *gpiod;
 	u32 enable_count;	/* a number of enabled shared GPIO */
 	u32 request_count;	/* a number of requested shared GPIO */
-	unsigned int ena_gpio_invert:1;
 };
 
 /*
···
 	}
 
 	pin->gpiod = gpiod;
-	pin->ena_gpio_invert = config->ena_gpio_invert;
 	list_add(&pin->list, &regulator_ena_gpio_list);
 
 update_ena_gpio_to_rdev:
···
 	if (enable) {
 		/* Enable GPIO at initial use */
 		if (pin->enable_count == 0)
-			gpiod_set_value_cansleep(pin->gpiod,
-						 !pin->ena_gpio_invert);
+			gpiod_set_value_cansleep(pin->gpiod, 1);
 
 		pin->enable_count++;
 	} else {
···
 
 		/* Disable GPIO if not used */
 		if (pin->enable_count <= 1) {
-			gpiod_set_value_cansleep(pin->gpiod,
-						 pin->ena_gpio_invert);
+			gpiod_set_value_cansleep(pin->gpiod, 0);
 			pin->enable_count = 0;
 		}
 	}

drivers/regulator/da9055-regulator.c

···
 		int gpio_mux = pdata->gpio_ren[id];
 
 		config->ena_gpiod = pdata->ena_gpiods[id];
-		config->ena_gpio_invert = 1;
 
 		/*
 		 * GPI pin is muxed with regulator to control the

drivers/regulator/fixed.c

···
 
 	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
 
-	/*
-	 * FIXME: we pulled active low/high and open drain handling into
-	 * gpiolib so it will be handled there. Delete this in the second
-	 * step when we also remove the custom inversion handling for all
-	 * legacy boardfiles.
-	 */
-	config->enable_high = 1;
-	config->gpio_is_open_drain = 0;
-
 	if (of_find_property(np, "vin-supply", NULL))
 		config->input_supply = "vin";
 
···
 
 	drvdata->desc.fixed_uV = config->microvolts;
 
-	cfg.ena_gpio_invert = !config->enable_high;
-	if (config->enabled_at_boot) {
-		if (config->enable_high)
-			gflags = GPIOD_OUT_HIGH;
-		else
-			gflags = GPIOD_OUT_LOW;
-	} else {
-		if (config->enable_high)
-			gflags = GPIOD_OUT_LOW;
-		else
-			gflags = GPIOD_OUT_HIGH;
-	}
-	if (config->gpio_is_open_drain) {
-		if (gflags == GPIOD_OUT_HIGH)
-			gflags = GPIOD_OUT_HIGH_OPEN_DRAIN;
-		else
-			gflags = GPIOD_OUT_LOW_OPEN_DRAIN;
-	}
+	/*
+	 * The signal will be inverted by the GPIO core if flagged so in the
+	 * decriptor.
+	 */
+	if (config->enabled_at_boot)
+		gflags = GPIOD_OUT_HIGH;
+	else
+		gflags = GPIOD_OUT_LOW;
 
 	/*
 	 * Some fixed regulators share the enable line between two

include/linux/regulator/fixed.h

···
  * @input_supply:	Name of the input regulator supply
  * @microvolts:		Output voltage of regulator
  * @startup_delay:	Start-up time in microseconds
- * @gpio_is_open_drain: Gpio pin is open drain or normal type.
- *			If it is open drain type then HIGH will be set
- *			through PULL-UP with setting gpio as input
- *			and low will be set as gpio-output with driven
- *			to low. For non-open-drain case, the gpio will
- *			will be in output and drive to low/high accordingly.
- * @enable_high:	Polarity of enable GPIO
- *			1 = Active high, 0 = Active low
  * @enabled_at_boot:	Whether regulator has been enabled at
  * 			boot or not. 1 = Yes, 0 = No
  * 			This is used to keep the regulator at
···
 	const char *input_supply;
 	int microvolts;
 	unsigned startup_delay;
-	unsigned gpio_is_open_drain:1;
-	unsigned enable_high:1;
 	unsigned enabled_at_boot:1;
 	struct regulator_init_data *init_data;
 };

include/linux/regulator/gpio-regulator.h

···
 /**
  * struct gpio_regulator_config - config structure
  * @supply_name:	Name of the regulator supply
- * @enable_gpio:	GPIO to use for enable control
- *			set to -EINVAL if not used
- * @enable_high:	Polarity of enable GPIO
- *			1 = Active high, 0 = Active low
  * @enabled_at_boot:	Whether regulator has been enabled at
  *			boot or not. 1 = Yes, 0 = No
  *			This is used to keep the regulator at
···
 struct gpio_regulator_config {
 	const char *supply_name;
 
-	int enable_gpio;
-	unsigned enable_high:1;
 	unsigned enabled_at_boot:1;
 	unsigned startup_delay;