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Subject: Re: [PATCH v7] regulator: fixed: Convert to use GPIO descriptor
 only
To:     Linus Walleij <linus.walleij@linaro.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>
Cc:     linux-kernel@vger.kernel.org,
        Janusz Krzysztofik <jmkrzyszt@gmail.com>,
        Alexander Shiyan <shc_work@mail.ru>,
        Haojian Zhuang <haojian.zhuang@gmail.com>,
        Aaro Koskinen <aaro.koskinen@iki.fi>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Robert Jarzmik <robert.jarzmik@free.fr>,
        Philipp Zabel <philipp.zabel@gmail.com>,
        Daniel Mack <zonque@gmail.com>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Jacopo Mondi <jacopo@jmondi.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Russell King <rmk+kernel@armlinux.org.uk>
From:   Marek Szyprowski <m.szyprowski@samsung.com>
Date:   Thu, 11 Oct 2018 11:01:11 +0200
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Hi All,

On 2018-09-06 14:24, Linus Walleij wrote:
> As we augmented the regulator core to accept a GPIO descriptor instead
> of a GPIO number, we can augment the fixed GPIO regulator to look up
> and pass that descriptor directly from device tree or board GPIO
> descriptor look up tables.
>
> Some boards just auto-enumerate their fixed regulator platform devices
> and I have assumed they get names like "fixed-regulator.0" but it's
> pretty hard to guess this. I need some testing from board maintainers to
> be sure. Other boards are straight forward, using just plain
> "fixed-regulator" (ID -1) or "fixed-regulator.1" hammering down the
> device ID.
>
> It seems the da9055 and da9211 has never got around to actually passing
> any enable gpio into its platform data (not the in-tree code anyway) so we
> can just decide to simply pass a descriptor instead.
>
> The fixed GPIO-controlled regulator in mach-pxa/ezx.c was confusingly named
> "*_dummy_supply_device" while it is a very real device backed by a GPIO
> line. There is nothing dummy about it at all, so I renamed it with the
> infix *_regulator_* as part of this patch set.
>
> Intel MID portions tested by Andy.
>
> Cc: Janusz Krzysztofik <jmkrzyszt@gmail.com> # OMAP1
> Cc: Alexander Shiyan <shc_work@mail.ru> # i.MX boards user
> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> # MMP2 maintainer
> Cc: Aaro Koskinen <aaro.koskinen@iki.fi> # OMAP1 maintainer
> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> # EM-X270 maintainer
> Cc: Robert Jarzmik <robert.jarzmik@free.fr> # EZX maintainer
> Cc: Philipp Zabel <philipp.zabel@gmail.com> # Magician maintainer
> Cc: Daniel Mack <zonque@gmail.com> # Raumfeld maintainer
> Cc: Marc Zyngier <marc.zyngier@arm.com> # Zeus maintainer
> Cc: Jacopo Mondi <jacopo@jmondi.org> # SH Ecovec24
> Cc: Geert Uytterhoeven <geert+renesas@glider.be> # SuperH pinctrl/GPIO maintainer
> Cc: Russell King <rmk+kernel@armlinux.org.uk> # SA1100
> Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> # Check the x86 BCM stuff
> Acked-by: Tony Lindgren <tony@atomide.com> # OMAP1,2,3 maintainer
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> Reviewed-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> Reviewed-by: Mike Rapoport <rppt@linux.vnet.ibm.com>

I've just noticed that this patch causes regression on Samsung
Exynos4412-based Trats2 board. Conversion to GPIO descriptor breaks
operation when regulators used shared GPIO:  sii9234 i2c driver
is not able to get vcc33mhl regulator (it uses shared GPIO enable
line with vsil12 regulator).

This issue has been already pointed in case of commits:
37fa23dbccbd97663acc085bd79246f427e603a1
d1dae72fab2c377ff463742eefd8ac0f9e99b7b9
ab4d11e2c2329cf7cb7be31ff22489aae4dee5dc

Maybe it would be better to first solve the handling of shared enable
GPIO in the descriptor-based interface before converting more regulators
and stepping into this issue again?

> ---
> ChangeLog v6->v7:
> - As the autobuilder churned along, after 24+ hours it was testing
>   SH and found a bug in the ecovec24 boardfile. It does test a
>   SH arch byt default, sh7763rdp_defconfig, sadly not this one.
>   So it discovers more obscure boards in later testing.
> - Shaked out this bug too and re-pushed and posted.
> ChangeLog v5->v6:
> - New code appeared in the OMAP1 AMS delta board that added a
>   new user of the removed .gpio member. The build robot was first
>   happy, then came back later and was not happy.
> - Fixed up the offending .gpio, now rebuilt for this OMAP1
>   board specifically to make sure it really really work now.
> ChangeLog v4->v5:
> - Rebased on v4.19-rc1
> - Put the OMAP1 AMD delta GPIO table addition in the *TOP*
>   of the ams_delta_gpio_tables[] so Janusz can add any
>   new addtions on the *BOTTOM*
> - Hopefully we can merge this now.
> ChangeLog v3->v4:
> - Rebase and adapt the OMAP1 changes for the GPIO descriptor
>   look-up tables deployed by Janusz.
> - Add two calls to add the GPIO descriptor tables properly on
>   the Super-H Ecovec24 board as pointed out by Geert.
> - Go over all patches to board files and make sure we pass
>   a NULL descriptor instead of an "enable" descriptor. The code
>   is looking for unnamed GPIOs as the device tree also just pass
>   gpio[s] = <&foo> so board files also need to use anonymous
>   GPIOs.
> - Fold in an EZX fix from Arnd Bergmann.
> - Add Andy's Tested-by tag.
> - Send this patch *ALONE* as I realized I need to take smaller
>   steps so things do not blow up left and right.
> ChangeLog v2->v3:
> - Resending.
> ChangeLog v1->v2:
> - Rebase the patch on mainline with Blackfin gone and other changes.
> - Fix up the new users that appeared in sa1100
> - Drop some suplus comments in x86.
> ---
>  arch/arm/mach-imx/mach-mx21ads.c              | 12 ++++++-
>  arch/arm/mach-imx/mach-mx27ads.c              | 12 ++++++-
>  arch/arm/mach-mmp/brownstone.c                | 12 ++++++-
>  arch/arm/mach-omap1/board-ams-delta.c         | 12 +++++--
>  arch/arm/mach-omap2/pdata-quirks.c            | 16 ++++++++-
>  arch/arm/mach-pxa/em-x270.c                   |  1 -
>  arch/arm/mach-pxa/ezx.c                       | 33 ++++++++++++-------
>  arch/arm/mach-pxa/magician.c                  |  2 +-
>  arch/arm/mach-pxa/raumfeld.c                  | 12 +++++--
>  arch/arm/mach-pxa/zeus.c                      | 23 +++++++++++--
>  arch/arm/mach-s3c64xx/mach-crag6410.c         |  1 -
>  arch/arm/mach-s3c64xx/mach-smdk6410.c         |  1 -
>  arch/arm/mach-sa1100/assabet.c                | 21 ++++++++----
>  arch/arm/mach-sa1100/generic.c                |  5 +--
>  arch/arm/mach-sa1100/generic.h                |  3 +-
>  arch/arm/mach-sa1100/shannon.c                |  4 +--
>  arch/sh/boards/mach-ecovec24/setup.c          | 27 +++++++++++++--
>  .../intel-mid/device_libs/platform_bcm43xx.c  | 17 ++++++++--
>  drivers/regulator/fixed-helper.c              |  1 -
>  drivers/regulator/fixed.c                     | 33 +++++++++----------
>  include/linux/regulator/fixed.h               |  3 --
>  21 files changed, 188 insertions(+), 63 deletions(-)
>
> diff --git a/arch/arm/mach-imx/mach-mx21ads.c b/arch/arm/mach-imx/mach-mx21ads.c
> index 5e366824814f..2e1e540f2e5a 100644
> --- a/arch/arm/mach-imx/mach-mx21ads.c
> +++ b/arch/arm/mach-imx/mach-mx21ads.c
> @@ -18,6 +18,7 @@
>  #include <linux/mtd/mtd.h>
>  #include <linux/mtd/physmap.h>
>  #include <linux/gpio/driver.h>
> +#include <linux/gpio/machine.h>
>  #include <linux/gpio.h>
>  #include <linux/regulator/fixed.h>
>  #include <linux/regulator/machine.h>
> @@ -175,6 +176,7 @@ static struct resource mx21ads_mmgpio_resource =
>  	DEFINE_RES_MEM_NAMED(MX21ADS_IO_REG, SZ_2, "dat");
>  
>  static struct bgpio_pdata mx21ads_mmgpio_pdata = {
> +	.label	= "mx21ads-mmgpio",
>  	.base	= MX21ADS_MMGPIO_BASE,
>  	.ngpio	= 16,
>  };
> @@ -203,7 +205,6 @@ static struct regulator_init_data mx21ads_lcd_regulator_init_data = {
>  static struct fixed_voltage_config mx21ads_lcd_regulator_pdata = {
>  	.supply_name	= "LCD",
>  	.microvolts	= 3300000,
> -	.gpio		= MX21ADS_IO_LCDON,
>  	.enable_high	= 1,
>  	.init_data	= &mx21ads_lcd_regulator_init_data,
>  };
> @@ -216,6 +217,14 @@ static struct platform_device mx21ads_lcd_regulator = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table mx21ads_lcd_regulator_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage.0", /* Let's hope ID 0 is what we get */
> +	.table = {
> +		GPIO_LOOKUP("mx21ads-mmgpio", 9, NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  /*
>   * Connected is a portrait Sharp-QVGA display
>   * of type: LQ035Q7DB02
> @@ -311,6 +320,7 @@ static void __init mx21ads_late_init(void)
>  {
>  	imx21_add_mxc_mmc(0, &mx21ads_sdhc_pdata);
>  
> +	gpiod_add_lookup_table(&mx21ads_lcd_regulator_gpiod_table);
>  	platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
>  
>  	mx21ads_cs8900_resources[1].start =
> diff --git a/arch/arm/mach-imx/mach-mx27ads.c b/arch/arm/mach-imx/mach-mx27ads.c
> index a04bb094ded1..f5e04047ed13 100644
> --- a/arch/arm/mach-imx/mach-mx27ads.c
> +++ b/arch/arm/mach-imx/mach-mx27ads.c
> @@ -16,6 +16,7 @@
>  #include <linux/gpio/driver.h>
>  /* Needed for gpio_to_irq() */
>  #include <linux/gpio.h>
> +#include <linux/gpio/machine.h>
>  #include <linux/platform_device.h>
>  #include <linux/mtd/mtd.h>
>  #include <linux/mtd/map.h>
> @@ -230,10 +231,17 @@ static struct regulator_init_data mx27ads_lcd_regulator_init_data = {
>  static struct fixed_voltage_config mx27ads_lcd_regulator_pdata = {
>  	.supply_name	= "LCD",
>  	.microvolts	= 3300000,
> -	.gpio		= MX27ADS_LCD_GPIO,
>  	.init_data	= &mx27ads_lcd_regulator_init_data,
>  };
>  
> +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),
> +		{ },
> +	},
> +};
> +
>  static void __init mx27ads_regulator_init(void)
>  {
>  	struct gpio_chip *vchip;
> @@ -247,6 +255,8 @@ static void __init mx27ads_regulator_init(void)
>  	vchip->set		= vgpio_set;
>  	gpiochip_add_data(vchip, NULL);
>  
> +	gpiod_add_lookup_table(&mx27ads_lcd_regulator_gpiod_table);
> +
>  	platform_device_register_data(NULL, "reg-fixed-voltage",
>  				      PLATFORM_DEVID_AUTO,
>  				      &mx27ads_lcd_regulator_pdata,
> diff --git a/arch/arm/mach-mmp/brownstone.c b/arch/arm/mach-mmp/brownstone.c
> index d1613b954926..a04e249c654b 100644
> --- a/arch/arm/mach-mmp/brownstone.c
> +++ b/arch/arm/mach-mmp/brownstone.c
> @@ -15,6 +15,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/io.h>
>  #include <linux/gpio-pxa.h>
> +#include <linux/gpio/machine.h>
>  #include <linux/regulator/machine.h>
>  #include <linux/regulator/max8649.h>
>  #include <linux/regulator/fixed.h>
> @@ -148,7 +149,6 @@ static struct regulator_init_data brownstone_v_5vp_data = {
>  static struct fixed_voltage_config brownstone_v_5vp = {
>  	.supply_name		= "v_5vp",
>  	.microvolts		= 5000000,
> -	.gpio			= GPIO_5V_ENABLE,
>  	.enable_high		= 1,
>  	.enabled_at_boot	= 1,
>  	.init_data		= &brownstone_v_5vp_data,
> @@ -162,6 +162,15 @@ static struct platform_device brownstone_v_5vp_device = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table brownstone_v_5vp_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage.1", /* .id set to 1 above */
> +	.table = {
> +		GPIO_LOOKUP("gpio-pxa", GPIO_5V_ENABLE,
> +			    NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  static struct max8925_platform_data brownstone_max8925_info = {
>  	.irq_base		= MMP_NR_IRQS,
>  };
> @@ -217,6 +226,7 @@ static void __init brownstone_init(void)
>  	mmp2_add_isram(&mmp2_isram_platdata);
>  
>  	/* enable 5v regulator */
> +	gpiod_add_lookup_table(&brownstone_v_5vp_gpiod_table);
>  	platform_device_register(&brownstone_v_5vp_device);
>  }
>  
> diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
> index dd28d2614d7f..f226973f3d8c 100644
> --- a/arch/arm/mach-omap1/board-ams-delta.c
> +++ b/arch/arm/mach-omap1/board-ams-delta.c
> @@ -300,7 +300,6 @@ static struct regulator_init_data modem_nreset_data = {
>  static struct fixed_voltage_config modem_nreset_config = {
>  	.supply_name		= "modem_nreset",
>  	.microvolts		= 3300000,
> -	.gpio			= AMS_DELTA_GPIO_PIN_MODEM_NRESET,
>  	.startup_delay		= 25000,
>  	.enable_high		= 1,
>  	.enabled_at_boot	= 1,
> @@ -315,6 +314,15 @@ static struct platform_device modem_nreset_device = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table ams_delta_nreset_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage",
> +	.table = {
> +		GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_MODEM_NRESET,
> +			    NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  struct modem_private_data {
>  	struct regulator *regulator;
>  };
> @@ -568,7 +576,6 @@ static struct regulator_init_data keybrd_pwr_initdata = {
>  static struct fixed_voltage_config keybrd_pwr_config = {
>  	.supply_name		= "keybrd_pwr",
>  	.microvolts		= 5000000,
> -	.gpio			= AMS_DELTA_GPIO_PIN_KEYBRD_PWR,
>  	.enable_high		= 1,
>  	.init_data		= &keybrd_pwr_initdata,
>  };
> @@ -602,6 +609,7 @@ static struct platform_device *ams_delta_devices[] __initdata = {
>  };
>  
>  static struct gpiod_lookup_table *ams_delta_gpio_tables[] __initdata = {
> +	&ams_delta_nreset_gpiod_table,
>  	&ams_delta_audio_gpio_table,
>  	&keybrd_pwr_gpio_table,
>  	&ams_delta_lcd_gpio_table,
> diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
> index 7f02743edbe4..d0f7a7cc70cb 100644
> --- a/arch/arm/mach-omap2/pdata-quirks.c
> +++ b/arch/arm/mach-omap2/pdata-quirks.c
> @@ -10,6 +10,7 @@
>  #include <linux/clk.h>
>  #include <linux/davinci_emac.h>
>  #include <linux/gpio.h>
> +#include <linux/gpio/machine.h>
>  #include <linux/init.h>
>  #include <linux/kernel.h>
>  #include <linux/of_platform.h>
> @@ -328,7 +329,6 @@ static struct regulator_init_data pandora_vmmc3 = {
>  static struct fixed_voltage_config pandora_vwlan = {
>  	.supply_name		= "vwlan",
>  	.microvolts		= 1800000, /* 1.8V */
> -	.gpio			= PANDORA_WIFI_NRESET_GPIO,
>  	.startup_delay		= 50000, /* 50ms */
>  	.enable_high		= 1,
>  	.init_data		= &pandora_vmmc3,
> @@ -342,6 +342,19 @@ static struct platform_device pandora_vwlan_device = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table pandora_vwlan_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage.1",
> +	.table = {
> +		/*
> +		 * As this is a low GPIO number it should be at the first
> +		 * GPIO bank.
> +		 */
> +		GPIO_LOOKUP("gpio-0-31", PANDORA_WIFI_NRESET_GPIO,
> +			    NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  static void pandora_wl1251_init_card(struct mmc_card *card)
>  {
>  	/*
> @@ -403,6 +416,7 @@ static void __init pandora_wl1251_init(void)
>  static void __init omap3_pandora_legacy_init(void)
>  {
>  	platform_device_register(&pandora_backlight);
> +	gpiod_add_lookup_table(&pandora_vwlan_gpiod_table);
>  	platform_device_register(&pandora_vwlan_device);
>  	omap_hsmmc_init(pandora_mmc3);
>  	omap_hsmmc_late_init(pandora_mmc3);
> diff --git a/arch/arm/mach-pxa/em-x270.c b/arch/arm/mach-pxa/em-x270.c
> index 29be04c6cc48..b14c47a6ee6b 100644
> --- a/arch/arm/mach-pxa/em-x270.c
> +++ b/arch/arm/mach-pxa/em-x270.c
> @@ -986,7 +986,6 @@ static struct fixed_voltage_config camera_dummy_config = {
>  	.supply_name		= "camera_vdd",
>  	.input_supply		= "vcc cam",
>  	.microvolts		= 2800000,
> -	.gpio			= -1,
>  	.enable_high		= 0,
>  	.init_data		= &camera_dummy_initdata,
>  };
> diff --git a/arch/arm/mach-pxa/ezx.c b/arch/arm/mach-pxa/ezx.c
> index 2c90b58f347d..565965e9acc7 100644
> --- a/arch/arm/mach-pxa/ezx.c
> +++ b/arch/arm/mach-pxa/ezx.c
> @@ -21,6 +21,7 @@
>  #include <linux/regulator/fixed.h>
>  #include <linux/input.h>
>  #include <linux/gpio.h>
> +#include <linux/gpio/machine.h>
>  #include <linux/gpio_keys.h>
>  #include <linux/leds-lp3944.h>
>  #include <linux/platform_data/i2c-pxa.h>
> @@ -698,31 +699,39 @@ static struct pxa27x_keypad_platform_data e2_keypad_platform_data = {
>  
>  #if defined(CONFIG_MACH_EZX_A780) || defined(CONFIG_MACH_EZX_A910)
>  /* camera */
> -static struct regulator_consumer_supply camera_dummy_supplies[] = {
> +static struct regulator_consumer_supply camera_regulator_supplies[] = {
>  	REGULATOR_SUPPLY("vdd", "0-005d"),
>  };
>  
> -static struct regulator_init_data camera_dummy_initdata = {
> -	.consumer_supplies = camera_dummy_supplies,
> -	.num_consumer_supplies = ARRAY_SIZE(camera_dummy_supplies),
> +static struct regulator_init_data camera_regulator_initdata = {
> +	.consumer_supplies = camera_regulator_supplies,
> +	.num_consumer_supplies = ARRAY_SIZE(camera_regulator_supplies),
>  	.constraints = {
>  		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
>  	},
>  };
>  
> -static struct fixed_voltage_config camera_dummy_config = {
> +static struct fixed_voltage_config camera_regulator_config = {
>  	.supply_name		= "camera_vdd",
>  	.microvolts		= 2800000,
> -	.gpio			= GPIO50_nCAM_EN,
>  	.enable_high		= 0,
> -	.init_data		= &camera_dummy_initdata,
> +	.init_data		= &camera_regulator_initdata,
>  };
>  
> -static struct platform_device camera_supply_dummy_device = {
> +static struct platform_device camera_supply_regulator_device = {
>  	.name	= "reg-fixed-voltage",
>  	.id	= 1,
>  	.dev	= {
> -		.platform_data = &camera_dummy_config,
> +		.platform_data = &camera_regulator_config,
> +	},
> +};
> +
> +static struct gpiod_lookup_table camera_supply_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage.1",
> +	.table = {
> +		GPIO_LOOKUP("gpio-pxa", GPIO50_nCAM_EN,
> +			    NULL, GPIO_ACTIVE_HIGH),
> +		{ },
>  	},
>  };
>  #endif
> @@ -800,7 +809,7 @@ static struct i2c_board_info a780_i2c_board_info[] = {
>  
>  static struct platform_device *a780_devices[] __initdata = {
>  	&a780_gpio_keys,
> -	&camera_supply_dummy_device,
> +	&camera_supply_regulator_device,
>  };
>  
>  static void __init a780_init(void)
> @@ -823,6 +832,7 @@ static void __init a780_init(void)
>  	if (a780_camera_init() == 0)
>  		pxa_set_camera_info(&a780_pxacamera_platform_data);
>  
> +	gpiod_add_lookup_table(&camera_supply_gpiod_table);
>  	pwm_add_table(ezx_pwm_lookup, ARRAY_SIZE(ezx_pwm_lookup));
>  	platform_add_devices(ARRAY_AND_SIZE(ezx_devices));
>  	platform_add_devices(ARRAY_AND_SIZE(a780_devices));
> @@ -1098,7 +1108,7 @@ static struct i2c_board_info __initdata a910_i2c_board_info[] = {
>  
>  static struct platform_device *a910_devices[] __initdata = {
>  	&a910_gpio_keys,
> -	&camera_supply_dummy_device,
> +	&camera_supply_regulator_device,
>  };
>  
>  static void __init a910_init(void)
> @@ -1121,6 +1131,7 @@ static void __init a910_init(void)
>  	if (a910_camera_init() == 0)
>  		pxa_set_camera_info(&a910_pxacamera_platform_data);
>  
> +	gpiod_add_lookup_table(&camera_supply_gpiod_table);
>  	pwm_add_table(ezx_pwm_lookup, ARRAY_SIZE(ezx_pwm_lookup));
>  	platform_add_devices(ARRAY_AND_SIZE(ezx_devices));
>  	platform_add_devices(ARRAY_AND_SIZE(a910_devices));
> diff --git a/arch/arm/mach-pxa/magician.c b/arch/arm/mach-pxa/magician.c
> index c5325d1ae77b..14c0f80bc9e7 100644
> --- a/arch/arm/mach-pxa/magician.c
> +++ b/arch/arm/mach-pxa/magician.c
> @@ -18,6 +18,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/delay.h>
>  #include <linux/gpio.h>
> +#include <linux/gpio/machine.h>
>  #include <linux/gpio_keys.h>
>  #include <linux/input.h>
>  #include <linux/mfd/htc-pasic3.h>
> @@ -696,7 +697,6 @@ static struct regulator_init_data vads7846_regulator = {
>  static struct fixed_voltage_config vads7846 = {
>  	.supply_name	= "vads7846",
>  	.microvolts	= 3300000, /* probably */
> -	.gpio		= -EINVAL,
>  	.startup_delay	= 0,
>  	.init_data	= &vads7846_regulator,
>  };
> diff --git a/arch/arm/mach-pxa/raumfeld.c b/arch/arm/mach-pxa/raumfeld.c
> index 034345546f84..bd3c23ad6ce6 100644
> --- a/arch/arm/mach-pxa/raumfeld.c
> +++ b/arch/arm/mach-pxa/raumfeld.c
> @@ -886,7 +886,6 @@ static struct regulator_init_data audio_va_initdata = {
>  static struct fixed_voltage_config audio_va_config = {
>  	.supply_name		= "audio_va",
>  	.microvolts		= 5000000,
> -	.gpio			= GPIO_AUDIO_VA_ENABLE,
>  	.enable_high		= 1,
>  	.enabled_at_boot	= 0,
>  	.init_data		= &audio_va_initdata,
> @@ -900,6 +899,15 @@ static struct platform_device audio_va_device = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table audio_va_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage.0",
> +	.table = {
> +		GPIO_LOOKUP("gpio-pxa", GPIO_AUDIO_VA_ENABLE,
> +			    NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  /* Dummy supplies for Codec's VD/VLC */
>  
>  static struct regulator_consumer_supply audio_dummy_supplies[] = {
> @@ -918,7 +926,6 @@ static struct regulator_init_data audio_dummy_initdata = {
>  static struct fixed_voltage_config audio_dummy_config = {
>  	.supply_name		= "audio_vd",
>  	.microvolts		= 3300000,
> -	.gpio			= -1,
>  	.init_data		= &audio_dummy_initdata,
>  };
>  
> @@ -1033,6 +1040,7 @@ static void __init raumfeld_audio_init(void)
>  	else
>  		gpio_direction_output(GPIO_MCLK_RESET, 1);
>  
> +	gpiod_add_lookup_table(&audio_va_gpiod_table);
>  	platform_add_devices(ARRAY_AND_SIZE(audio_regulator_devices));
>  }
>  
> diff --git a/arch/arm/mach-pxa/zeus.c b/arch/arm/mach-pxa/zeus.c
> index e3851795d6d7..d53ea12fc766 100644
> --- a/arch/arm/mach-pxa/zeus.c
> +++ b/arch/arm/mach-pxa/zeus.c
> @@ -17,6 +17,7 @@
>  #include <linux/irq.h>
>  #include <linux/pm.h>
>  #include <linux/gpio.h>
> +#include <linux/gpio/machine.h>
>  #include <linux/serial_8250.h>
>  #include <linux/dm9000.h>
>  #include <linux/mmc/host.h>
> @@ -410,7 +411,6 @@ static struct regulator_init_data can_regulator_init_data = {
>  static struct fixed_voltage_config can_regulator_pdata = {
>  	.supply_name	= "CAN_SHDN",
>  	.microvolts	= 3300000,
> -	.gpio		= ZEUS_CAN_SHDN_GPIO,
>  	.init_data	= &can_regulator_init_data,
>  };
>  
> @@ -422,6 +422,15 @@ static struct platform_device can_regulator_device = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table can_regulator_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage.0",
> +	.table = {
> +		GPIO_LOOKUP("gpio-pxa", ZEUS_CAN_SHDN_GPIO,
> +			    NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  static struct mcp251x_platform_data zeus_mcp2515_pdata = {
>  	.oscillator_frequency	= 16*1000*1000,
>  };
> @@ -538,7 +547,6 @@ static struct regulator_init_data zeus_ohci_regulator_data = {
>  static struct fixed_voltage_config zeus_ohci_regulator_config = {
>  	.supply_name		= "vbus2",
>  	.microvolts		= 5000000, /* 5.0V */
> -	.gpio			= ZEUS_USB2_PWREN_GPIO,
>  	.enable_high		= 1,
>  	.startup_delay		= 0,
>  	.init_data		= &zeus_ohci_regulator_data,
> @@ -552,6 +560,15 @@ static struct platform_device zeus_ohci_regulator_device = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table zeus_ohci_regulator_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage.0",
> +	.table = {
> +		GPIO_LOOKUP("gpio-pxa", ZEUS_USB2_PWREN_GPIO,
> +			    NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  static struct pxaohci_platform_data zeus_ohci_platform_data = {
>  	.port_mode	= PMM_NPS_MODE,
>  	/* Clear Power Control Polarity Low and set Power Sense
> @@ -855,6 +872,8 @@ static void __init zeus_init(void)
>  
>  	pxa2xx_mfp_config(ARRAY_AND_SIZE(zeus_pin_config));
>  
> +	gpiod_add_lookup_table(&can_regulator_gpiod_table);
> +	gpiod_add_lookup_table(&zeus_ohci_regulator_gpiod_table);
>  	platform_add_devices(zeus_devices, ARRAY_SIZE(zeus_devices));
>  
>  	zeus_register_ohci();
> diff --git a/arch/arm/mach-s3c64xx/mach-crag6410.c b/arch/arm/mach-s3c64xx/mach-crag6410.c
> index f04650297487..379424d72ae7 100644
> --- a/arch/arm/mach-s3c64xx/mach-crag6410.c
> +++ b/arch/arm/mach-s3c64xx/mach-crag6410.c
> @@ -352,7 +352,6 @@ static struct fixed_voltage_config wallvdd_pdata = {
>  	.supply_name = "WALLVDD",
>  	.microvolts = 5000000,
>  	.init_data = &wallvdd_data,
> -	.gpio = -EINVAL,
>  };
>  
>  static struct platform_device wallvdd_device = {
> diff --git a/arch/arm/mach-s3c64xx/mach-smdk6410.c b/arch/arm/mach-s3c64xx/mach-smdk6410.c
> index c46fa5dfd2e0..908e5aa831c8 100644
> --- a/arch/arm/mach-s3c64xx/mach-smdk6410.c
> +++ b/arch/arm/mach-s3c64xx/mach-smdk6410.c
> @@ -222,7 +222,6 @@ static struct fixed_voltage_config smdk6410_b_pwr_5v_pdata = {
>  	.supply_name = "B_PWR_5V",
>  	.microvolts = 5000000,
>  	.init_data = &smdk6410_b_pwr_5v_data,
> -	.gpio = -EINVAL,
>  };
>  
>  static struct platform_device smdk6410_b_pwr_5v = {
> diff --git a/arch/arm/mach-sa1100/assabet.c b/arch/arm/mach-sa1100/assabet.c
> index 575ec085cffa..3e8c0948abcc 100644
> --- a/arch/arm/mach-sa1100/assabet.c
> +++ b/arch/arm/mach-sa1100/assabet.c
> @@ -101,7 +101,7 @@ static int __init assabet_init_gpio(void __iomem *reg, u32 def_val)
>  
>  	assabet_bcr_gc = gc;
>  
> -	return gc->base;
> +	return 0;
>  }
>  
>  /*
> @@ -471,6 +471,14 @@ static struct fixed_voltage_config assabet_cf_vcc_pdata __initdata = {
>  	.enable_high = 1,
>  };
>  
> +static struct gpiod_lookup_table assabet_cf_vcc_gpio_table = {
> +	.dev_id = "reg-fixed-voltage.0",
> +	.table = {
> +		GPIO_LOOKUP("assabet", 0, NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  static void __init assabet_init(void)
>  {
>  	/*
> @@ -517,9 +525,11 @@ static void __init assabet_init(void)
>  			neponset_resources, ARRAY_SIZE(neponset_resources));
>  #endif
>  	} else {
> +		gpiod_add_lookup_table(&assabet_cf_vcc_gpio_table);
>  		sa11x0_register_fixed_regulator(0, &assabet_cf_vcc_pdata,
> -					 assabet_cf_vcc_consumers,
> -					 ARRAY_SIZE(assabet_cf_vcc_consumers));
> +					assabet_cf_vcc_consumers,
> +					ARRAY_SIZE(assabet_cf_vcc_consumers),
> +					true);
>  
>  	}
>  
> @@ -802,7 +812,6 @@ fs_initcall(assabet_leds_init);
>  
>  void __init assabet_init_irq(void)
>  {
> -	unsigned int assabet_gpio_base;
>  	u32 def_val;
>  
>  	sa1100_init_irq();
> @@ -817,9 +826,7 @@ void __init assabet_init_irq(void)
>  	 *
>  	 * This must precede any driver calls to BCR_set() or BCR_clear().
>  	 */
> -	assabet_gpio_base = assabet_init_gpio((void *)&ASSABET_BCR, def_val);
> -
> -	assabet_cf_vcc_pdata.gpio = assabet_gpio_base + 0;
> +	assabet_init_gpio((void *)&ASSABET_BCR, def_val);
>  }
>  
>  MACHINE_START(ASSABET, "Intel-Assabet")
> diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c
> index 7167ddf84a0e..800321c6cbd8 100644
> --- a/arch/arm/mach-sa1100/generic.c
> +++ b/arch/arm/mach-sa1100/generic.c
> @@ -348,7 +348,8 @@ void __init sa11x0_init_late(void)
>  
>  int __init sa11x0_register_fixed_regulator(int n,
>  	struct fixed_voltage_config *cfg,
> -	struct regulator_consumer_supply *supplies, unsigned num_supplies)
> +	struct regulator_consumer_supply *supplies, unsigned num_supplies,
> +	bool uses_gpio)
>  {
>  	struct regulator_init_data *id;
>  
> @@ -356,7 +357,7 @@ int __init sa11x0_register_fixed_regulator(int n,
>  	if (!cfg->init_data)
>  		return -ENOMEM;
>  
> -	if (cfg->gpio < 0)
> +	if (!uses_gpio)
>  		id->constraints.always_on = 1;
>  	id->constraints.name = cfg->supply_name;
>  	id->constraints.min_uV = cfg->microvolts;
> diff --git a/arch/arm/mach-sa1100/generic.h b/arch/arm/mach-sa1100/generic.h
> index 5f3cb52fa6ab..158a4fd5ca24 100644
> --- a/arch/arm/mach-sa1100/generic.h
> +++ b/arch/arm/mach-sa1100/generic.h
> @@ -54,4 +54,5 @@ void sa11x0_register_pcmcia(int socket, struct gpiod_lookup_table *);
>  struct fixed_voltage_config;
>  struct regulator_consumer_supply;
>  int sa11x0_register_fixed_regulator(int n, struct fixed_voltage_config *cfg,
> -	struct regulator_consumer_supply *supplies, unsigned num_supplies);
> +	struct regulator_consumer_supply *supplies, unsigned num_supplies,
> +	bool uses_gpio);
> diff --git a/arch/arm/mach-sa1100/shannon.c b/arch/arm/mach-sa1100/shannon.c
> index 22f7fe0b809f..5bc82e2671c6 100644
> --- a/arch/arm/mach-sa1100/shannon.c
> +++ b/arch/arm/mach-sa1100/shannon.c
> @@ -102,14 +102,14 @@ static struct fixed_voltage_config shannon_cf_vcc_pdata __initdata = {
>  	.supply_name = "cf-power",
>  	.microvolts = 3300000,
>  	.enabled_at_boot = 1,
> -	.gpio = -EINVAL,
>  };
>  
>  static void __init shannon_init(void)
>  {
>  	sa11x0_register_fixed_regulator(0, &shannon_cf_vcc_pdata,
>  					shannon_cf_vcc_consumers,
> -					ARRAY_SIZE(shannon_cf_vcc_consumers));
> +					ARRAY_SIZE(shannon_cf_vcc_consumers),
> +					false);
>  	sa11x0_register_pcmcia(0, &shannon_pcmcia0_gpio_table);
>  	sa11x0_register_pcmcia(1, &shannon_pcmcia1_gpio_table);
>  	sa11x0_ppc_configure_mcp();
> diff --git a/arch/sh/boards/mach-ecovec24/setup.c b/arch/sh/boards/mach-ecovec24/setup.c
> index adc61d14172c..06a894526a0b 100644
> --- a/arch/sh/boards/mach-ecovec24/setup.c
> +++ b/arch/sh/boards/mach-ecovec24/setup.c
> @@ -633,7 +633,6 @@ static struct regulator_init_data cn12_power_init_data = {
>  static struct fixed_voltage_config cn12_power_info = {
>  	.supply_name = "CN12 SD/MMC Vdd",
>  	.microvolts = 3300000,
> -	.gpio = GPIO_PTB7,
>  	.enable_high = 1,
>  	.init_data = &cn12_power_init_data,
>  };
> @@ -646,6 +645,16 @@ static struct platform_device cn12_power = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table cn12_power_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage.0",
> +	.table = {
> +		/* Offset 7 on port B */
> +		GPIO_LOOKUP("sh7724_pfc", GPIO_PTB7,
> +			    NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  #if defined(CONFIG_MMC_SDHI) || defined(CONFIG_MMC_SDHI_MODULE)
>  /* SDHI0 */
>  static struct regulator_consumer_supply sdhi0_power_consumers[] =
> @@ -665,7 +674,6 @@ static struct regulator_init_data sdhi0_power_init_data = {
>  static struct fixed_voltage_config sdhi0_power_info = {
>  	.supply_name = "CN11 SD/MMC Vdd",
>  	.microvolts = 3300000,
> -	.gpio = GPIO_PTB6,
>  	.enable_high = 1,
>  	.init_data = &sdhi0_power_init_data,
>  };
> @@ -678,6 +686,16 @@ static struct platform_device sdhi0_power = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table sdhi0_power_gpiod_table = {
> +	.dev_id = "reg-fixed-voltage.1",
> +	.table = {
> +		/* Offset 6 on port B */
> +		GPIO_LOOKUP("sh7724_pfc", GPIO_PTB6,
> +			    NULL, GPIO_ACTIVE_HIGH),
> +		{ },
> +	},
> +};
> +
>  static struct tmio_mmc_data sdhi0_info = {
>  	.chan_priv_tx	= (void *)SHDMA_SLAVE_SDHI0_TX,
>  	.chan_priv_rx	= (void *)SHDMA_SLAVE_SDHI0_RX,
> @@ -1413,6 +1431,11 @@ static int __init arch_setup(void)
>  				    DMA_MEMORY_EXCLUSIVE);
>  	platform_device_add(ecovec_ceu_devices[1]);
>  
> +	gpiod_add_lookup_table(&cn12_power_gpiod_table);
> +#if defined(CONFIG_MMC_SDHI) || defined(CONFIG_MMC_SDHI_MODULE)
> +	gpiod_add_lookup_table(&sdhi0_power_gpiod_table);
> +#endif
> +
>  	return platform_add_devices(ecovec_devices,
>  				    ARRAY_SIZE(ecovec_devices));
>  }
> diff --git a/arch/x86/platform/intel-mid/device_libs/platform_bcm43xx.c b/arch/x86/platform/intel-mid/device_libs/platform_bcm43xx.c
> index 4392c15ed9e0..dbfc5cf2aa93 100644
> --- a/arch/x86/platform/intel-mid/device_libs/platform_bcm43xx.c
> +++ b/arch/x86/platform/intel-mid/device_libs/platform_bcm43xx.c
> @@ -10,7 +10,7 @@
>   * of the License.
>   */
>  
> -#include <linux/gpio.h>
> +#include <linux/gpio/machine.h>
>  #include <linux/platform_device.h>
>  #include <linux/regulator/machine.h>
>  #include <linux/regulator/fixed.h>
> @@ -43,7 +43,6 @@ static struct fixed_voltage_config bcm43xx_vmmc = {
>  	 * real voltage and signaling are still 1.8V.
>  	 */
>  	.microvolts		= 2000000,		/* 1.8V */
> -	.gpio			= -EINVAL,
>  	.startup_delay		= 250 * 1000,		/* 250ms */
>  	.enable_high		= 1,			/* active high */
>  	.enabled_at_boot	= 0,			/* disabled at boot */
> @@ -58,11 +57,23 @@ static struct platform_device bcm43xx_vmmc_regulator = {
>  	},
>  };
>  
> +static struct gpiod_lookup_table bcm43xx_vmmc_gpio_table = {
> +	.dev_id	= "reg-fixed-voltage.0",
> +	.table	= {
> +		GPIO_LOOKUP("0000:00:0c.0", -1, NULL, GPIO_ACTIVE_LOW),
> +		{}
> +	},
> +};
> +
>  static int __init bcm43xx_regulator_register(void)
>  {
> +	struct gpiod_lookup_table *table = &bcm43xx_vmmc_gpio_table;
> +	struct gpiod_lookup *lookup = table->table;
>  	int ret;
>  
> -	bcm43xx_vmmc.gpio = get_gpio_by_name(WLAN_SFI_GPIO_ENABLE_NAME);
> +	lookup[0].chip_hwnum = get_gpio_by_name(WLAN_SFI_GPIO_ENABLE_NAME);
> +	gpiod_add_lookup_table(table);
> +
>  	ret = platform_device_register(&bcm43xx_vmmc_regulator);
>  	if (ret) {
>  		pr_err("%s: vmmc regulator register failed\n", __func__);
> diff --git a/drivers/regulator/fixed-helper.c b/drivers/regulator/fixed-helper.c
> index 777fac6fb4cb..2c6098e6f4bc 100644
> --- a/drivers/regulator/fixed-helper.c
> +++ b/drivers/regulator/fixed-helper.c
> @@ -43,7 +43,6 @@ struct platform_device *regulator_register_always_on(int id, const char *name,
>  	}
>  
>  	data->cfg.microvolts = uv;
> -	data->cfg.gpio = -EINVAL;
>  	data->cfg.enabled_at_boot = 1;
>  	data->cfg.init_data = &data->init_data;
>  
> diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
> index 988a7472c2ab..1142f195529b 100644
> --- a/drivers/regulator/fixed.c
> +++ b/drivers/regulator/fixed.c
> @@ -24,10 +24,9 @@
>  #include <linux/platform_device.h>
>  #include <linux/regulator/driver.h>
>  #include <linux/regulator/fixed.h>
> -#include <linux/gpio.h>
> +#include <linux/gpio/consumer.h>
>  #include <linux/slab.h>
>  #include <linux/of.h>
> -#include <linux/of_gpio.h>
>  #include <linux/regulator/of_regulator.h>
>  #include <linux/regulator/machine.h>
>  
> @@ -78,10 +77,6 @@ of_get_fixed_voltage_config(struct device *dev,
>  	if (init_data->constraints.boot_on)
>  		config->enabled_at_boot = true;
>  
> -	config->gpio = of_get_named_gpio(np, "gpio", 0);
> -	if ((config->gpio < 0) && (config->gpio != -ENOENT))
> -		return ERR_PTR(config->gpio);
> -
>  	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
>  
>  	config->enable_high = of_property_read_bool(np, "enable-active-high");
> @@ -102,6 +97,7 @@ static int reg_fixed_voltage_probe(struct platform_device *pdev)
>  	struct fixed_voltage_config *config;
>  	struct fixed_voltage_data *drvdata;
>  	struct regulator_config cfg = { };
> +	enum gpiod_flags gflags;
>  	int ret;
>  
>  	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data),
> @@ -150,25 +146,28 @@ static int reg_fixed_voltage_probe(struct platform_device *pdev)
>  
>  	drvdata->desc.fixed_uV = config->microvolts;
>  
> -	if (gpio_is_valid(config->gpio)) {
> -		cfg.ena_gpio = config->gpio;
> -		if (pdev->dev.of_node)
> -			cfg.ena_gpio_initialized = true;
> -	}
>  	cfg.ena_gpio_invert = !config->enable_high;
>  	if (config->enabled_at_boot) {
>  		if (config->enable_high)
> -			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
> +			gflags = GPIOD_OUT_HIGH;
>  		else
> -			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
> +			gflags = GPIOD_OUT_LOW;
>  	} else {
>  		if (config->enable_high)
> -			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
> +			gflags = GPIOD_OUT_LOW;
>  		else
> -			cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
> +			gflags = GPIOD_OUT_HIGH;
>  	}
> -	if (config->gpio_is_open_drain)
> -		cfg.ena_gpio_flags |= GPIOF_OPEN_DRAIN;
> +	if (config->gpio_is_open_drain) {
> +		if (gflags == GPIOD_OUT_HIGH)
> +			gflags = GPIOD_OUT_HIGH_OPEN_DRAIN;
> +		else
> +			gflags = GPIOD_OUT_LOW_OPEN_DRAIN;
> +	}
> +
> +	cfg.ena_gpiod = devm_gpiod_get_optional(&pdev->dev, NULL, gflags);
> +	if (IS_ERR(cfg.ena_gpiod))
> +		return PTR_ERR(cfg.ena_gpiod);
>  
>  	cfg.dev = &pdev->dev;
>  	cfg.init_data = config->init_data;
> diff --git a/include/linux/regulator/fixed.h b/include/linux/regulator/fixed.h
> index 48918be649d4..1a4340ed8e2b 100644
> --- a/include/linux/regulator/fixed.h
> +++ b/include/linux/regulator/fixed.h
> @@ -24,8 +24,6 @@ struct regulator_init_data;
>   * @supply_name:	Name of the regulator supply
>   * @input_supply:	Name of the input regulator supply
>   * @microvolts:		Output voltage of regulator
> - * @gpio:		GPIO to use for enable control
> - * 			set to -EINVAL if not used
>   * @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
> @@ -49,7 +47,6 @@ struct fixed_voltage_config {
>  	const char *supply_name;
>  	const char *input_supply;
>  	int microvolts;
> -	int gpio;
>  	unsigned startup_delay;
>  	unsigned gpio_is_open_drain:1;
>  	unsigned enable_high:1;
>

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland