[PATCH v2] platform/x86: int3472: Add TPS68470 board data for Dell Latitude 7275

[D. Manresa]

The Dell Latitude 7275 2-in-1 has the same camera design as the Latitude
7212 Rugged Extreme Tablet: an OmniVision OV5670 front sensor (ACPI
INT3479) powered by a TI TPS68470 PMIC, with GPIO 3 as reset and GPIO 4 as
powerdown and the same regulator voltages. The only difference is that the
PMIC ACPI node enumerates as INT3472:04 instead of INT3472:05, so the
existing board data is not matched and the driver fails with "No
board-data found for this model".

Add a board data entry for the Latitude 7275 reusing the 7212 regulator
and GPIO tables with the right device name.

Assisted-by: Claude Code:claude-fable-5-1
Signed-off-by: D. Manresa <dmanresa@xxxxxxxxx>
---
Tested on a Latitude 7275 (BIOS 1.18.0): the PMIC probes, the OV5670
binds and libcamera streams from the IPU3.

The sensor sits on the I2C4 controller (INT3446), whose MMIO region
overlaps the ACPI OperationRegion \_SB.PCI0.GEXP.BAR0 (both use the
GNVS variable SB04), so intel_lpss_acpi only binds with
acpi_enforce_resources=lax. This is the same BIOS bug as on the Latitude
5285, fixed by Thierry Chatard's "mfd: intel-lpss: add resource conflict
quirk for Dell Latitude 5285" [1]; a follow-up patch adds the 7275 to
that quirk's DMI table.

[1] https://lore.kernel.org/linux-media/20260831160754.9857-2-tchatard@xxxxxxxxx/

Changes in v2:
- Move the test notes and the I2C4/GEXP remark below the '---' line
  (Sakari).
- Point at the Latitude 5285 intel-lpss quirk for the resource conflict.
- Add an Assisted-by tag.

--- a/drivers/platform/x86/intel/int3472/tps68470_board_data.c
+++ b/drivers/platform/x86/intel/int3472/tps68470_board_data.c
@@ -449,6 +449,15 @@
 	},
 };
 
+static const struct int3472_tps68470_board_data dell_7275_tps68470_board_data = {
+	.dev_name = "i2c-INT3472:04",
+	.tps68470_regulator_pdata = &dell_7212_tps68470_pdata,
+	.n_gpiod_lookups = 1,
+	.tps68470_gpio_lookup_tables = {
+		&dell_7212_int3479_gpios,
+	},
+};
+
 static const struct int3472_tps68470_board_data msi_prestige_ai_evo_tps68470_board_data = {
 	.dev_name = "i2c-INT3472:06",
 	.tps68470_regulator_pdata = &msi_prestige_ai_evo_tps68470_pdata,
@@ -500,6 +509,13 @@
 	},
 	{
 		.matches = {
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 7275"),
+		},
+		.driver_data = (void *)&dell_7275_tps68470_board_data,
+	},
+	{
+		.matches = {
 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Micro-Star International Co., Ltd."),
 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Prestige 13 AI+ Evo A2VMG"),
 			DMI_EXACT_MATCH(DMI_BOARD_NAME, "MS-13Q3"),