[PATCH] platform/x86: int3472: Add GPIO type 0x02 (strobe) mapping

[Marco Nenciarini <mnencia@kcore.it>]

Some ACPI tables on Intel Meteor Lake and Arrow Lake platforms define
GPIO resources with type 0x02 for INT3472 camera sensor power control.
This type is not currently handled, causing a "GPIO type 0x02 unknown;
the sensor may not work" warning and preventing proper sensor power
sequencing.

Map GPIO type 0x02 (strobe) to the privacy LED handler, matching the
approach used for similar illumination-related GPIOs. This is consistent
with the original proposal by Hao Yao [1].

Tested on a Dell Pro Max 16 Premium (Arrow Lake-H) with OmniVision
OV08F4 sensor connected via Intel IPU6 and Synaptics SVP7500 USBIO
bridge. With this patch applied, the int3472-discrete driver no longer
warns about unknown GPIO type 0x02, and the sensor probes successfully.

[1] https://lore.kernel.org/all/20231007021309.9332-1-hao.yao@intel.com/

Link: https://bugs.debian.org/1130114
Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2138991
Cc: Hao Yao <hao.yao@intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Marco Nenciarini <mnencia@kcore.it>
---
 drivers/platform/x86/intel/int3472/discrete.c | 3 +++
 include/linux/platform_data/x86/int3472.h     | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index 1505fc3..39ca60b 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -211,6 +211,7 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
 		*con_id = "clk-enable";
 		*gpio_flags = GPIO_ACTIVE_HIGH;
 		break;
+	case INT3472_GPIO_TYPE_STROBE:
 	case INT3472_GPIO_TYPE_PRIVACY_LED:
 		*con_id = "privacy-led";
 		*gpio_flags = GPIO_ACTIVE_HIGH;
@@ -330,6 +331,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 
 		break;
 	case INT3472_GPIO_TYPE_CLK_ENABLE:
+	case INT3472_GPIO_TYPE_STROBE:
 	case INT3472_GPIO_TYPE_PRIVACY_LED:
 	case INT3472_GPIO_TYPE_POWER_ENABLE:
 	case INT3472_GPIO_TYPE_HANDSHAKE:
@@ -347,6 +349,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 				err_msg = "Failed to register clock\n";
 
 			break;
+		case INT3472_GPIO_TYPE_STROBE:
 		case INT3472_GPIO_TYPE_PRIVACY_LED:
 			ret = skl_int3472_register_pled(int3472, gpio);
 			if (ret)
diff --git a/include/linux/platform_data/x86/int3472.h b/include/linux/platform_data/x86/int3472.h
index b1b8375..85adeb0 100644
--- a/include/linux/platform_data/x86/int3472.h
+++ b/include/linux/platform_data/x86/int3472.h
@@ -23,6 +23,7 @@
 /* PMIC GPIO Types */
 #define INT3472_GPIO_TYPE_RESET					0x00
 #define INT3472_GPIO_TYPE_POWERDOWN				0x01
+#define INT3472_GPIO_TYPE_STROBE				0x02
 #define INT3472_GPIO_TYPE_POWER_ENABLE				0x0b
 #define INT3472_GPIO_TYPE_CLK_ENABLE				0x0c
 #define INT3472_GPIO_TYPE_PRIVACY_LED				0x0d
-- 
2.47.3