kernel: k3-6.18: fix BeagleBadge e-ink overlay patch not applying

[igorpecovnik]

Problem

k3 kernel builds (e.g. sk-am62-lp / BRANCH=vendor-edge) fail during kernel patching:

0003-arm64-dts-ti-add-BeagleBadge-GDEY042T81-overlay.patch
  Hunk #1 FAILED at 64  →  1 out of 1 hunk FAILED
Exception: Failed to apply 1 patches.  →  build aborts

(reported via a build log paste)

Root cause

The overlay patch's arch/arm64/boot/dts/ti/Makefile hunk anchors on a base-board line:

dtb-$(CONFIG_ARCH_K3) += k3-am62l3-badge.dtb        # ← does not exist

That line isn't in the ti-linux 6.18 kernel. The board is actually named k3-am62l3-beaglebadge.dtb there (and lives after the # Boards with AM62Lx SoCs comment). The patch was generated against a tree that named/placed the board differently, so the hunk context never matches and the whole k3 patch series fails.

Fix

Re-anchor the Makefile hunk onto the real k3-am62l3-beaglebadge.dtb line, adding the overlay entry next to its board. Only the patch's Makefile hunk changes; the .dtso payload is untouched.

Verification

Applied the patch with the exact command the build uses — patch --batch -p1 -N --reject-file=… --quoting-style=c (from lib/tools/common/patching_utils.py) — against the real ti-linux 6.18 arch/arm64/boot/dts/ti/Makefile:

• exit 0, no rejects; the .dtso overlay file is created.
• The canonical diff -u hunk applies at GNU patch's default fuzz (the previous hand-anchor needed fuzz 3, which the build's default-fuzz patch call would reject).

Note

The base BeagleBadge board is k3-am62l3-beaglebadge, but the overlay this patch adds is still named k3-am62l3-badge-eink-gdey042t81 (as the original author wrote it). It compiles fine standalone. If the maintainer (@Andrei1998 / the SSD16xx series) wants naming consistency, the overlay could be renamed to k3-am62l3-beaglebadge-eink-gdey042t81 in a follow-up — out of scope for this unblock.

Summary by CodeRabbit

• New Features
  • Added support for the GDEY042T81 e-paper display on the AM62L BeagleBadge.
  • Configured display communication, control signals, and 2 MHz operation.
  • Included the display overlay in the device tree build.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a GDEY042T81 e-paper device-tree overlay for the AM62L BeagleBadge. The overlay configures SPI0, pin multiplexing, display control GPIOs, and a 2 MHz display device. The K3 DTB build now registers the overlay.

Changes

BeagleBadge e-paper support

Layer / File(s)	Summary
E-paper overlay and DTB registration patch/kernel/archive/k3-6.18/0003-arm64-dts-ti-add-BeagleBadge-GDEY042T81-overlay.patch	The overlay configures SPI0, pin multiplexing, reset/DC/busy GPIOs, and the GDEY042T81 display at 2 MHz. The K3 device-tree build registers the resulting DTBO.

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

Possibly related PRs

• armbian/build#10333: Includes the BeagleBadge GDEY042T81 device-tree overlay in broader e-paper display integration.

Suggested labels: Ready to merge

Suggested reviewers: jonaswood01, glneo, 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: fixing the BeagleBadge e-ink overlay patch so it applies correctly.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/k3-beaglebadge-eink-patch-apply

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[Andrei1998]

If the maintainer (@Andrei1998 / the SSD16xx series) wants naming consistency, the overlay could be renamed to k3-am62l3-beaglebadge-eink-gdey042t81 in a follow-up

@igorpecovnik I think you might have gotten the wrong Andrei.

[igorpecovnik]

You are right, appologize.