[PATCH] platform/x86: int3472: Add handshake GPIO function

From: Hao Yao <hao.yao@intel.com>
To: Dan Scally <dan.scally@ideasonboard.com>,
	djrscally@gmail.com, Hans de Goede <hdegoede@redhat.com>,
	Sakari Ailus <sakari.ailus@intel.com>
Cc: Bingbu Cao <bingbu.cao@intel.com>,
	platform-driver-x86@vger.kernel.org, linux-media@vger.kernel.org,
	Hao Yao <hao.yao@intel.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: [PATCH] platform/x86: int3472: Add handshake GPIO function
Date: Sat,  7 Oct 2023 10:12:25 +0800	[thread overview]
Message-ID: <20231007021225.9240-1-hao.yao@intel.com> (raw)

Handshake pin is used for Lattice MIPI aggregator to enable the
camera sensor. After pulled up, recommend to wail ~250ms to get
everything ready.

Signed-off-by: Hao Yao <hao.yao@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/platform/x86/intel/int3472/common.h   | 1 +
 drivers/platform/x86/intel/int3472/discrete.c | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/platform/x86/intel/int3472/common.h b/drivers/platform/x86/intel/int3472/common.h
index 655ae3ec0593..3ad4c72afb45 100644
--- a/drivers/platform/x86/intel/int3472/common.h
+++ b/drivers/platform/x86/intel/int3472/common.h
@@ -23,6 +23,7 @@
 #define INT3472_GPIO_TYPE_POWER_ENABLE				0x0b
 #define INT3472_GPIO_TYPE_CLK_ENABLE				0x0c
 #define INT3472_GPIO_TYPE_PRIVACY_LED				0x0d
+#define INT3472_GPIO_TYPE_HANDSHAKE				0x12
 
 #define INT3472_PDEV_MAX_NAME_LEN				23
 #define INT3472_MAX_SENSOR_GPIOS				3
diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index b644ce65c990..4753161b4080 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -111,6 +111,10 @@ static void int3472_get_func_and_polarity(u8 type, const char **func, u32 *polar
 		*func = "power-enable";
 		*polarity = GPIO_ACTIVE_HIGH;
 		break;
+	case INT3472_GPIO_TYPE_HANDSHAKE:
+		*func = "handshake";
+		*polarity = GPIO_ACTIVE_HIGH;
+		break;
 	default:
 		*func = "unknown";
 		*polarity = GPIO_ACTIVE_HIGH;
@@ -201,6 +205,7 @@ 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_HANDSHAKE:
 		ret = skl_int3472_map_gpio_to_sensor(int3472, agpio, func, polarity);
 		if (ret)
 			err_msg = "Failed to map GPIO pin to sensor\n";
-- 
2.34.1

