[PATCH v2] platform/x86: int3472: support the POWER1 GPIO type

INT3472 can describe a second sensor power rail as a GPIO of type
POWER1 (0x08), which the driver does not recognise, so the rail is left
unmapped and never enabled:

  int3472-discrete INT3472:01: GPIO type 0x08 unknown; the sensor may
  not work

On the Microsoft Surface Pro 7+ the rear camera's INT3472 (INT347A,
ov8865) has such a pin; without it the ov8865 "dvdd" supply resolves to
a dummy regulator and the sensor never probes.

Define the POWER0 (0x07) and POWER1 (0x08) GPIO types and map POWER1 to
a regulator with con_id "dvdd" for all devices, the supply the in-tree
ov8865 driver already requests. POWER0 is defined but left unmapped, as
no device that uses it is known.

Out-of-tree work approached the same rail by exposing it to the sensor
as a new "pwr1" supply (linux-surface PR #1867 for the Surface Pro 9,
PR #2201 for the Pro 7+ ov8865); mapping POWER1 to the existing "dvdd"
keeps the change contained to int3472.

With this change the Surface Pro 7+ rear camera probes and streams
reliably.

Link: https://github.com/linux-surface/linux-surface/pull/1867
Link: https://github.com/linux-surface/linux-surface/pull/2201
Suggested-by: Sakari Ailus <[email protected]>
Signed-off-by: Jakob Berg Jespersen <[email protected]>
---
Changes in v2:

- Reworked from a per-device INT347A quirk into a generic mapping of the
  POWER1 (0x08) GPIO type to "dvdd" for all devices, per review.
- Added INT3472_GPIO_TYPE_POWER0 (0x07) and POWER1 (0x08) definitions;
  POWER0 is defined but left unmapped for now.
- Retested on the Surface Pro 7+ (kernel 7.1.5): the rear ov8865 probes,
  instantiates its VCM, and streams.
- Link to v1: https://patch.msgid.link/[email protected]
---
 drivers/platform/x86/intel/int3472/discrete.c | 8 ++++++++
 include/linux/platform_data/x86/int3472.h     | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index 115bb37577a1..5be1b153c2d9 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -227,6 +227,10 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
 		*con_id = "avdd";
 		*gpio_flags = GPIO_ACTIVE_HIGH;
 		break;
+	case INT3472_GPIO_TYPE_POWER1:
+		*con_id = "dvdd";
+		*gpio_flags = GPIO_ACTIVE_HIGH;
+		break;
 	case INT3472_GPIO_TYPE_DOVDD:
 		*con_id = "dovdd";
 		*gpio_flags = GPIO_ACTIVE_HIGH;
@@ -257,6 +261,8 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
  * 0x00 Reset
  * 0x01 Power down
  * 0x02 Strobe
+ * 0x07 Power 0
+ * 0x08 Power 1
  * 0x0b Power enable
  * 0x0c Clock enable
  * 0x0d Privacy LED
@@ -343,6 +349,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 	case INT3472_GPIO_TYPE_PRIVACY_LED:
 	case INT3472_GPIO_TYPE_STROBE:
 	case INT3472_GPIO_TYPE_POWER_ENABLE:
+	case INT3472_GPIO_TYPE_POWER1:
 	case INT3472_GPIO_TYPE_DOVDD:
 	case INT3472_GPIO_TYPE_HANDSHAKE:
 		gpio = skl_int3472_gpiod_get_from_temp_lookup(int3472, agpio, con_id, gpio_flags);
@@ -369,6 +376,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 		case INT3472_GPIO_TYPE_POWER_ENABLE:
 			second_sensor = int3472->quirks.avdd_second_sensor;
 			fallthrough;
+		case INT3472_GPIO_TYPE_POWER1:
 		case INT3472_GPIO_TYPE_DOVDD:
 		case INT3472_GPIO_TYPE_HANDSHAKE:
 			ret = skl_int3472_register_regulator(int3472, gpio, enable_time_us,
diff --git a/include/linux/platform_data/x86/int3472.h b/include/linux/platform_data/x86/int3472.h
index a73841dfae27..b1040e36deb8 100644
--- a/include/linux/platform_data/x86/int3472.h
+++ b/include/linux/platform_data/x86/int3472.h
@@ -25,6 +25,8 @@
 #define INT3472_GPIO_TYPE_RESET					0x00
 #define INT3472_GPIO_TYPE_POWERDOWN				0x01
 #define INT3472_GPIO_TYPE_STROBE				0x02
+#define INT3472_GPIO_TYPE_POWER0				0x07
+#define INT3472_GPIO_TYPE_POWER1				0x08
 #define INT3472_GPIO_TYPE_POWER_ENABLE				0x0b
 #define INT3472_GPIO_TYPE_CLK_ENABLE				0x0c
 #define INT3472_GPIO_TYPE_PRIVACY_LED				0x0d

---
base-commit: 2b3a5dabe89e330413af403246b648c1890f368f
change-id: 20260719-sp7plus-int3472-8f014b8de79c

Best regards,
--  
Jakob Berg Jespersen <[email protected]>