Re: [PATCH v4 3/5] platform/x86: int3472: tps68470: add board data for Dell Latitude 5285

From: Sakari Ailus

Date: Wed Apr 22 2026 - 03:14:59 EST

Hi Thierry,

On Tue, Apr 21, 2026 at 03:52:15PM -0700, Thierry Chatard wrote:
> The Dell Latitude 5285 2-in-1 has two cameras connected through a TPS68470
> PMIC/clock/GPIO hub:
>
> Front: OV5670 (ACPI INT3479) on I2C4
> Back: OV8858 (ACPI INT3477) on I2C2, daisy-chained behind TPS68470
> S_I2C port (controlled by reg 0x43 S_I2C_CTL)
>
> GPIO mapping (TPS68470):
> INT3479 (OV5670): GPIO3 = reset, GPIO4 = powerdown (both active-low)
> INT3477 (OV8858): GPIO9 = s_resetn, GPIO7 = s_enable (both active-low)
> GPIO9 and GPIO7 are the TPS68470 secondary-port GPIOs (SGPO reg 0x22
> bits 2 and 0), not regular GPDO outputs.
>
> Regulator mapping:
> CORE -> dvdd / INT3477
> ANA -> avdd / INT3477
> VIO -> generic (hardware always-on, no enable register, no consumers)

That is not what the datasheet says.

> VSIO -> dovdd / INT3477: enabling VSIO sets S_I2C_CTL (reg 0x43),
> opening the I2C passthrough to OV8858; the ov8858 driver
> enables dovdd at probe time, which naturally activates the
> passthrough before any I2C transaction to the sensor.
> AUX1 -> dvdd / INT3479
> AUX2 -> dovdd / INT3479
>
> A static clock consumer list is provided for both sensors (INT3477 and
> INT3479) to work around the broken ACPI _DEP on INT3479 described in the
> previous patch.
>
> Signed-off-by: Thierry Chatard <tchatard@xxxxxxxxx>
> ---
> .../x86/intel/int3472/tps68470_board_data.c | 169 +++++++++++++++++-
> 1 file changed, 166 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/platform/x86/intel/int3472/tps68470_board_data.c b/drivers/platform/x86/intel/int3472/tps68470_board_data.c
> index 71357a036..b40ac4fc5 100644
> --- a/drivers/platform/x86/intel/int3472/tps68470_board_data.c
> +++ b/drivers/platform/x86/intel/int3472/tps68470_board_data.c
> @@ -74,8 +74,12 @@ static const struct regulator_init_data surface_go_tps68470_vcm_reg_init_data =
> .consumer_supplies = int347a_vcm_consumer_supplies,
> };
>
> -/* Ensure the always-on VIO regulator has the same voltage as VSIO */
> -static const struct regulator_init_data surface_go_tps68470_vio_reg_init_data = {
> +/*
> + * VIO has no enable register (always on at hardware level) and must never
> + * have direct consumers -- all outputs go through VSIO. Its voltage must
> + * exactly match VSIO on any board using the I2C pass-through.
> + */
> +static const struct regulator_init_data generic_tps68470_vio_reg_init_data = {
> .constraints = {
> .min_uV = 1800600,
> .max_uV = 1800600,
> @@ -122,7 +126,7 @@ static const struct tps68470_regulator_platform_data surface_go_tps68470_pdata =
> [TPS68470_CORE] = &surface_go_tps68470_core_reg_init_data,
> [TPS68470_ANA] = &surface_go_tps68470_ana_reg_init_data,
> [TPS68470_VCM] = &surface_go_tps68470_vcm_reg_init_data,
> - [TPS68470_VIO] = &surface_go_tps68470_vio_reg_init_data,
> + [TPS68470_VIO] = &generic_tps68470_vio_reg_init_data,
> [TPS68470_VSIO] = &surface_go_tps68470_vsio_reg_init_data,
> [TPS68470_AUX1] = &surface_go_tps68470_aux1_reg_init_data,
> [TPS68470_AUX2] = &surface_go_tps68470_aux2_reg_init_data,
> @@ -287,6 +291,158 @@ static const struct int3472_tps68470_board_data dell_7212_tps68470_board_data =
> },
> };
>
> +/* Settings for Dell Latitude 5285 2-in-1 */
> +
> +/*
> + * The BIOS leaves GNVS field C0TP at zero, which causes INT3479's _DEP to
> + * resolve to PCI0 instead of the INT3472 device. Provide a static clock
> + * consumer list so probe registers MCLK lookups for both sensors regardless
> + * of the broken _DEP traversal.
> + */
> +static const struct tps68470_clk_consumer dell_5285_clk_consumers[] = {
> + { .consumer_dev_name = "i2c-INT3477:00" }, /* OV8858 rear camera */
> + { .consumer_dev_name = "i2c-INT3479:00" }, /* OV5670 front camera */
> +};
> +
> +static struct regulator_consumer_supply dell_5285_int3477_ana_consumer_supplies[] = {
> + REGULATOR_SUPPLY("avdd", "i2c-INT3477:00"),
> +};
> +
> +static struct regulator_consumer_supply dell_5285_int3477_core_consumer_supplies[] = {
> + REGULATOR_SUPPLY("dvdd", "i2c-INT3477:00"),
> +};
> +
> +/*
> + * VSIO controls the S_I2C_CTL passthrough. Its voltage must match VIO
> + * exactly (both 1800600 uV). Mapping VSIO to dovdd/INT3477 means the
> + * passthrough is enabled when the ov8858 driver enables its dovdd supply.
> + */
> +static struct regulator_consumer_supply dell_5285_int3477_vsio_consumer_supplies[] = {
> + REGULATOR_SUPPLY("dovdd", "i2c-INT3477:00"),
> +};
> +
> +static struct regulator_consumer_supply dell_5285_int3479_aux1_consumer_supplies[] = {
> + REGULATOR_SUPPLY("dvdd", "i2c-INT3479:00"),
> +};
> +
> +static struct regulator_consumer_supply dell_5285_int3479_aux2_consumer_supplies[] = {
> + REGULATOR_SUPPLY("dovdd", "i2c-INT3479:00"),
> +};
> +
> +static const struct regulator_init_data dell_5285_tps68470_core_reg_init_data = {
> + .constraints = {
> + .min_uV = 1200000,
> + .max_uV = 1200000,
> + .apply_uV = 1,
> + .valid_ops_mask = REGULATOR_CHANGE_STATUS,
> + },
> + .num_consumer_supplies = ARRAY_SIZE(dell_5285_int3477_core_consumer_supplies),
> + .consumer_supplies = dell_5285_int3477_core_consumer_supplies,
> +};
> +
> +static const struct regulator_init_data dell_5285_tps68470_ana_reg_init_data = {
> + .constraints = {
> + .min_uV = 2815200,
> + .max_uV = 2815200,
> + .apply_uV = 1,
> + .valid_ops_mask = REGULATOR_CHANGE_STATUS,
> + },
> + .num_consumer_supplies = ARRAY_SIZE(dell_5285_int3477_ana_consumer_supplies),
> + .consumer_supplies = dell_5285_int3477_ana_consumer_supplies,
> +};
> +
> +static const struct regulator_init_data dell_5285_tps68470_vcm_reg_init_data = {
> + .constraints = {
> + .min_uV = 2815200,
> + .max_uV = 2815200,
> + .apply_uV = 1,
> + .valid_ops_mask = REGULATOR_CHANGE_STATUS,
> + },
> + .num_consumer_supplies = 0,
> + .consumer_supplies = NULL,
> +};
> +
> +static const struct regulator_init_data dell_5285_tps68470_vsio_reg_init_data = {
> + .constraints = {
> + .min_uV = 1800600,
> + .max_uV = 1800600,
> + .apply_uV = 1,
> + .valid_ops_mask = REGULATOR_CHANGE_STATUS,
> + },
> + .num_consumer_supplies = ARRAY_SIZE(dell_5285_int3477_vsio_consumer_supplies),
> + .consumer_supplies = dell_5285_int3477_vsio_consumer_supplies,
> +};
> +
> +static const struct regulator_init_data dell_5285_tps68470_aux1_reg_init_data = {
> + .constraints = {
> + .min_uV = 1213200,
> + .max_uV = 1213200,
> + .apply_uV = 1,
> + .valid_ops_mask = REGULATOR_CHANGE_STATUS,
> + },
> + .num_consumer_supplies = ARRAY_SIZE(dell_5285_int3479_aux1_consumer_supplies),
> + .consumer_supplies = dell_5285_int3479_aux1_consumer_supplies,
> +};
> +
> +static const struct regulator_init_data dell_5285_tps68470_aux2_reg_init_data = {
> + .constraints = {
> + .min_uV = 1800600,
> + .max_uV = 1800600,
> + .apply_uV = 1,
> + .valid_ops_mask = REGULATOR_CHANGE_STATUS,
> + },
> + .num_consumer_supplies = ARRAY_SIZE(dell_5285_int3479_aux2_consumer_supplies),
> + .consumer_supplies = dell_5285_int3479_aux2_consumer_supplies,
> +};
> +
> +static const struct tps68470_regulator_platform_data dell_5285_tps68470_pdata = {
> + .reg_init_data = {
> + [TPS68470_CORE] = &dell_5285_tps68470_core_reg_init_data,
> + [TPS68470_ANA] = &dell_5285_tps68470_ana_reg_init_data,
> + [TPS68470_VCM] = &dell_5285_tps68470_vcm_reg_init_data,
> + [TPS68470_VIO] = &generic_tps68470_vio_reg_init_data,
> + [TPS68470_VSIO] = &dell_5285_tps68470_vsio_reg_init_data,
> + [TPS68470_AUX1] = &dell_5285_tps68470_aux1_reg_init_data,
> + [TPS68470_AUX2] = &dell_5285_tps68470_aux2_reg_init_data,
> + },
> +};
> +
> +static struct gpiod_lookup_table dell_5285_int3477_gpios = {
> + .dev_id = "i2c-INT3477:00",
> + .table = {
> + /*
> + * TPS68470 GPIO9 = s_resetn (secondary camera reset, active-low)
> + * TPS68470 GPIO7 = s_enable (secondary camera enable/powerdown)
> + * These logic outputs are specifically designed for secondary
> + * camera control on the TPS68470. Matches Surface Go pattern.
> + */
> + GPIO_LOOKUP("tps68470-gpio", 9, "reset", GPIO_ACTIVE_LOW),
> + GPIO_LOOKUP("tps68470-gpio", 7, "powerdown", GPIO_ACTIVE_LOW),
> + { }
> + }
> +};
> +
> +static struct gpiod_lookup_table dell_5285_int3479_gpios = {
> + .dev_id = "i2c-INT3479:00",
> + .table = {
> + GPIO_LOOKUP("tps68470-gpio", 3, "reset", GPIO_ACTIVE_LOW),
> + GPIO_LOOKUP("tps68470-gpio", 4, "powerdown", GPIO_ACTIVE_LOW),
> + { }
> + }
> +};
> +
> +static const struct int3472_tps68470_board_data dell_5285_tps68470_board_data = {
> + .dev_name = "i2c-INT3472:05",
> + .tps68470_regulator_pdata = &dell_5285_tps68470_pdata,
> + .n_clk_consumers = ARRAY_SIZE(dell_5285_clk_consumers),
> + .clk_consumers = dell_5285_clk_consumers,
> + .n_gpiod_lookups = 2,
> + .tps68470_gpio_lookup_tables = {
> + &dell_5285_int3477_gpios,
> + &dell_5285_int3479_gpios,
> + },
> +};
> +
> static const struct dmi_system_id int3472_tps68470_board_data_table[] = {
> {
> .matches = {
> @@ -316,6 +472,13 @@ static const struct dmi_system_id int3472_tps68470_board_data_table[] = {
> },
> .driver_data = (void *)&dell_7212_tps68470_board_data,
> },
> + {
> + .matches = {
> + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
> + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 5285"),
> + },
> + .driver_data = (void *)&dell_5285_tps68470_board_data,
> + },
> { }
> };
>

--
Regards,

Sakari Ailus