linux-kernel - [PATCH v4 1/1] platform/x86: int3472: add hpd pin support

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Message-Id: <20250702112130.858536-1-sakari.ailus@linux.intel.com>
Date: Wed,  2 Jul 2025 14:21:30 +0300
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: linux-media@...r.kernel.org
Cc: platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	hans@...erkuil.nl,
	andriy.shevchenko@...ux.intel.com,
	hdegoede@...hat.com,
	u.kleine-koenig@...libre.com,
	ricardo.ribalda@...il.com,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	bingbu.cao@...ux.intel.com,
	dongcheng.yan@...ux.intel.com,
	hao.yao@...el.com
Subject: [PATCH v4 1/1] platform/x86: int3472: add hpd pin support

From: Dongcheng Yan <dongcheng.yan@...el.com>

Typically HDMI to MIPI CSI-2 bridges have a pin to signal image data is
being received. On the host side this is wired to a GPIO for polling or
interrupts. This includes the Lontium HDMI to MIPI CSI-2 bridges
lt6911uxe and lt6911uxc.

The GPIO "hpd" is used already by other HDMI to CSI-2 bridges, use it
here as well.

Signed-off-by: Dongcheng Yan <dongcheng.yan@...el.com>
Reviewed-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
---
since v3:

- Rebase due to commit 53eddae9af0c0b46f9c77a02d23c21c1aa824739
  ("platform/x86: int3472: Move common.h to public includes, symbols to
  INTEL_INT3472"), moving the new GPIO PIN definition from common.h to
  int3472.h.

The intent is to merge this via the media tree, with Ilpo's ack.

 drivers/platform/x86/intel/int3472/discrete.c | 6 ++++++
 include/linux/platform_data/x86/int3472.h     | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index 4c0aed6e626f..bdfb8a800c54 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -193,6 +193,10 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
 		*con_id = "privacy-led";
 		*gpio_flags = GPIO_ACTIVE_HIGH;
 		break;
+	case INT3472_GPIO_TYPE_HOTPLUG_DETECT:
+		*con_id = "hpd";
+		*gpio_flags = GPIO_ACTIVE_HIGH;
+		break;
 	case INT3472_GPIO_TYPE_POWER_ENABLE:
 		*con_id = "avdd";
 		*gpio_flags = GPIO_ACTIVE_HIGH;
@@ -223,6 +227,7 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
  * 0x0b Power enable
  * 0x0c Clock enable
  * 0x0d Privacy LED
+ * 0x13 Hotplug detect
  *
  * There are some known platform specific quirks where that does not quite
  * hold up; for example where a pin with type 0x01 (Power down) is mapped to
@@ -292,6 +297,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 	switch (type) {
 	case INT3472_GPIO_TYPE_RESET:
 	case INT3472_GPIO_TYPE_POWERDOWN:
+	case INT3472_GPIO_TYPE_HOTPLUG_DETECT:
 		ret = skl_int3472_map_gpio_to_sensor(int3472, agpio, con_id, gpio_flags);
 		if (ret)
 			err_msg = "Failed to map GPIO pin to sensor\n";
diff --git a/include/linux/platform_data/x86/int3472.h b/include/linux/platform_data/x86/int3472.h
index 78276a11c48d..1571e9157fa5 100644
--- a/include/linux/platform_data/x86/int3472.h
+++ b/include/linux/platform_data/x86/int3472.h
@@ -27,6 +27,7 @@
 #define INT3472_GPIO_TYPE_CLK_ENABLE				0x0c
 #define INT3472_GPIO_TYPE_PRIVACY_LED				0x0d
 #define INT3472_GPIO_TYPE_HANDSHAKE				0x12
+#define INT3472_GPIO_TYPE_HOTPLUG_DETECT			0x13
 
 #define INT3472_PDEV_MAX_NAME_LEN				23
 #define INT3472_MAX_SENSOR_GPIOS				3
-- 
2.39.5