k3-6.18: make BeagleBadge e-ink overlay patch apply on all branches

[igorpecovnik]

Problem

kernel-k3-vendor-rt (e.g. BOARD=beaglebadge BRANCH=vendor-rt) fails patching:

0003-arm64-dts-ti-add-BeagleBadge-GDEY042T81-overlay: Hunk #1 FAILED at 67
Failed to apply 1 patches

Root cause

The k3 branches pull different kernel snapshots, and each names/places the BeagleBadge board differently in arch/arm64/boot/dts/ti/Makefile:

Branch	Kernel	Board line
vendor / vendor-rt	TI PSDK tag 12.00.00.07	k3-am62l3-badge.dtb (before the # Boards… comment)
edge / vendor-edge	ti-linux-6.18.y branch	k3-am62l3-beaglebadge.dtb (after the comment)

The original patch anchored on k3-am62l3-badge.dtb (worked on the tag), and #10380 re-anchored on k3-am62l3-beaglebadge.dtb (fixed edge) — so each fix worked for one snapshot and broke the other.

Fix

Anchor the Makefile insertion on the evm overlay entries (…-eqep.dtbo / …-mcan.dtbo / …-pwm.dtbo), which are identical and contiguous in both snapshots, and add the e-ink .dtbo there. It's an overlay, so it belongs in the overlay group anyway — and this avoids the board line that differs between trees entirely.

Verification

Applied with the build's exact command (patch --batch -p1 -N --quoting-style=c) against both arch/arm64/boot/dts/ti/Makefiles:

• PSDK tag 12.00.00.07 (vendor/vendor-rt): exit 0, no rejects.
• ti-linux-6.18.y (edge/vendor-edge): exit 0, no rejects (1-line offset).

The .dtso payload is unchanged; only the Makefile hunk anchor moved.

Summary by CodeRabbit

• New Features
  • Added support for the BeagleBadge GDEY042T81 e-paper display.
  • Enabled display communication and required control signals on compatible TI K3-based boards.
  • The display is now available through the device tree overlay for supported hardware.

[coderabbitai]

📝 Walkthrough

Walkthrough

The patch adds a BeagleBadge GDEY042T81 e-paper device-tree overlay. It configures SPI0, display control GPIOs, pin multiplexing, and a 2 MHz SPI limit. It also registers the resulting DTBO in the TI K3 build lists.

Changes

BeagleBadge e-paper support

Layer / File(s)	Summary
Define the e-paper overlay patch/kernel/archive/k3-6.18/0003-arm64-dts-ti-add-BeagleBadge-GDEY042T81-overlay.patch	The overlay configures AM62Lx pin groups, enables SPI0, and defines the GDEY042T81 display node with its SPI and GPIO settings.
Register the overlay patch/kernel/archive/k3-6.18/0003-arm64-dts-ti-add-BeagleBadge-GDEY042T81-overlay.patch	The K3 device-tree build lists include k3-am62l3-badge-eink-gdey042t81.dtbo for the AM62Lx BeagleBadge board.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• armbian/build#10266: Adds another Beagle-board K3 device-tree overlay.
• armbian/build#10333: Adds the same BeagleBadge GDEY042T81 overlay.
• armbian/build#10380: Updates the same overlay patch and DTBO registration.

Suggested reviewers: jonaswood01, grippy98

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: making the BeagleBadge e-ink overlay patch apply across k3-6.18 branches.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/k3-beaglebadge-eink-both-trees

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[coderabbitai]

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

patch/kernel/archive/k3-6.18/0003-arm64-dts-ti-add-BeagleBadge-GDEY042T81-overlay.patch (1)

84-84: 🗄️ Data Integrity & Integration | 🟠 Major | ⚡ Quick win

Ensure CONFIG_DRM_PANEL_SSD16XX is enabled in both target kernel configs.

gooddisplay,gdey042t81 requires panel-ssd16xx from CONFIG_DRM_PANEL_SSD16XX, and this patch only adds the device-tree compatible string. Set it to y or build it as m in both PSDK 12.00.00.07 and ti-linux-6.18.y, then verify the panel-ssd16xx module is installed on target.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In
`@patch/kernel/archive/k3-6.18/0003-arm64-dts-ti-add-BeagleBadge-GDEY042T81-overlay.patch`
at line 84, Enable CONFIG_DRM_PANEL_SSD16XX as y or m in both the PSDK
12.00.00.07 and ti-linux-6.18.y kernel configurations, and ensure the resulting
panel-ssd16xx module is installed on the target alongside the
gooddisplay,gdey042t81 overlay.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Outside diff comments:
In
`@patch/kernel/archive/k3-6.18/0003-arm64-dts-ti-add-BeagleBadge-GDEY042T81-overlay.patch`:
- Line 84: Enable CONFIG_DRM_PANEL_SSD16XX as y or m in both the PSDK
12.00.00.07 and ti-linux-6.18.y kernel configurations, and ensure the resulting
panel-ssd16xx module is installed on the target alongside the
gooddisplay,gdey042t81 overlay.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 8408604d-2b28-4fdc-aa67-af72d172b205

📥 Commits

Reviewing files that changed from the base of the PR and between d28c4c8 and 995727c.

📒 Files selected for processing (1)

• patch/kernel/archive/k3-6.18/0003-arm64-dts-ti-add-BeagleBadge-GDEY042T81-overlay.patch