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IMX708: Add support for 4-lane operation #6775

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IMX708: Add support for 4-lane operation #6775

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2d38887
imx708: intial support for 4-lane operation
peyton-howe Apr 2, 2025
0a886f7
Update pixel rate for 4lane full resolution and make HBLANK controllable
peyton-howe Apr 4, 2025
2e4be19
Rework imx708 driver to modify pixel rate and line length based on th…
peyton-howe Apr 5, 2025
9e77b99
Some minor cleanup to better match IMX415 structure for dynamic setti…
peyton-howe Apr 9, 2025
1fd4408
Add missing vblank back to set_framing_limits and minor cleanup of na…
peyton-howe Apr 9, 2025
f31864a
Back to unsigned int for line_length_pix
peyton-howe Apr 9, 2025
55c7b20
Restructure WIP
peyton-howe Jun 6, 2025
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2 changes: 2 additions & 0 deletions arch/arm/boot/dts/overlays/README
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Original file line number Diff line number Diff line change
Expand Up @@ -2972,6 +2972,8 @@ Params: rotation Mounting rotation of the camera sensor (0 or
Compute Module (CSI0, i2c_vc, and cam0_reg).
link-frequency Allowable link frequency values to use in Hz:
450000000 (default), 447000000, 453000000.
4lane Enable 4 CSI2 lanes. This requires a Compute
Module (1, 3, 4, or 5) or Pi 5.


Name: interludeaudio-analog
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17 changes: 17 additions & 0 deletions arch/arm/boot/dts/overlays/imx708-overlay.dts
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Expand Up @@ -81,6 +81,22 @@
};
};

fragment@201 {
target = <&csi_ep>;
__dormant__ {
data-lanes = <1 2 3 4>;
};
};

fragment@202 {
target = <&cam_endpoint>;
__dormant__ {
data-lanes = <1 2 3 4>;
link-frequencies =
/bits/ 64 <547000000>;
};
};

__overrides__ {
rotation = <&cam_node>,"rotation:0";
orientation = <&cam_node>,"orientation:0";
Expand All @@ -95,6 +111,7 @@
vcm = <&vcm_node>, "status",
<0>, "=4";
link-frequency = <&cam_endpoint>,"link-frequencies#0";
4lane = <0>, "+201+202";
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It looks like there could be a confusing interaction between link-frequency and 4lane overrides, which both try to change <&cam_endpoint>/link-frequencies. The actual frequency may depend on the order in which the dtparams are given.

If that's the case, is there a cleaner way to do it that would always give priority to the link-frequency?

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Sadly there isn't a way to set priorities on DT overrides.

What could be done is to add a fragment 203 which sets the link frequency for 2 lane mode. link-frequency then updates both 202 and 203, and 4lane disables 203 as well as enabling 201 and 202. At least that should give a consistent behaviour.

};
};

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