[PATCH v4 11/15] media: atomisp: provide Yoga Book OV2740 link frequency

[Maurizio Casciano]

The Lenovo Yoga Book YB1-X91 firmware does not describe the front
OV2740 link frequency. Extend the AtomISP sensor configuration with an
optional frequency and assign the 288 MHz Yoga Book value while adding
its ACPI ID.

Pass the value through the IPU bridge per-sensor endpoint data so the
OV2740 driver selects its matching mode and the AtomISP CSI-2 receiver
derives the correct D-PHY timing.

Link: https://lore.kernel.org/linux-media/apFzAc5XfV9gQpXS@kekkonen.localdomain/
Signed-off-by: Maurizio Casciano <mauriziocasciano7@xxxxxxxxx>
Assisted-by: Codex:gpt-5.6-sol sparse
---
 .../media/atomisp/pci/atomisp_csi2_bridge.c       | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c b/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c
index 56da454f0d9e..226c81409848 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_csi2_bridge.c
@@ -15,6 +15,7 @@
 #include <linux/dmi.h>
 #include <linux/platform_data/x86/int3472.h>
 #include <linux/property.h>
+#include <linux/units.h>
 
 #include <media/ipu-bridge.h>
 #include <media/v4l2-fwnode.h>
@@ -43,14 +44,16 @@ static const guid_t vcm_dsm_guid =
 		  0x9f, 0x48, 0xa9, 0xc3, 0xb5, 0xda, 0x78, 0x9f);
 
 struct atomisp_sensor_config {
+	u64 link_freq;
 	int lanes;
 	bool vcm;
 };
 
-#define ATOMISP_SENSOR_CONFIG(_HID, _LANES, _VCM)			\
+#define ATOMISP_SENSOR_CONFIG(_HID, _LANES, _VCM, _LINK_FREQ)	\
 {									\
 	.id = _HID,							\
 	.driver_data = (long)&((const struct atomisp_sensor_config) {	\
+		.link_freq = _LINK_FREQ,				\
 		.lanes = _LANES,					\
 		.vcm = _VCM,						\
 	})								\
@@ -374,9 +377,11 @@ static const struct acpi_device_id atomisp_sensor_configs[] = {
 	 * an i2c-client for the VCM, so it is disabled for now.
 	 */
 	/* OV5693 */
-	ATOMISP_SENSOR_CONFIG("INT33BE", 2, false),
+	ATOMISP_SENSOR_CONFIG("INT33BE", 2, false, 0),
 	/* OV8858 */
-	ATOMISP_SENSOR_CONFIG("INT3477", 4, true),
+	ATOMISP_SENSOR_CONFIG("INT3477", 4, true, 0),
+	/* OV2740 */
+	ATOMISP_SENSOR_CONFIG("OVTI2740", 2, false, 288 * HZ_PER_MHZ),
 	{}
 };
 
@@ -395,6 +400,10 @@ static int atomisp_csi2_parse_sensor_fwnode(struct acpi_device *adev,
 
 		lanes = cfg->lanes;
 		vcm = cfg->vcm;
+		if (cfg->link_freq) {
+			sensor->link_freqs[0] = cfg->link_freq;
+			sensor->nr_link_freqs = 1;
+		}
 	}
 
 	/*
-- 
2.53.0