[PATCH v2 0/1] AM65x MMC power-off delay fix

[Judith Mendez <jm@ti.com>]

This series adds power-off-delay-us in AM65x EVM DT to ensure proper MMC
card power cycling during boot.

AM65x EVM VDD rail discharges slowly (~632.97ms) through RC circuit.
Without sufficient power-off delay, SD card boot fails in bootloader stage.

AM65x SD boot failure was initially exposed by U-Boot MMC driver patch [0],
which was correct but revealed EVM hardware limitation. There is no SD card
boot failure in Linux yet, but proper power cycling is required regardless.
Additionally, equivalent Linux kernel discussions for similar fix [0] are
ongoing. Linux MMC driver now supports delay after MMC power-off [1] and
this patch adds power-off-delay-us=650ms to AM65x EVM DT.

Links:
[0] U-Boot patch & debug discussion:
https://lore.kernel.org/u-boot/d17a810c-e2db-4a24-a37d-2d7e02466ce9@ti.com/

[1] Merged power_off_delay_us support in Linux MMC:
https://lore.kernel.org/linux-mmc/20260806162202.657512-1-jm@ti.com/

V1: https://lore.kernel.org/linux-devicetree/20260908170635.238775-1-jm@ti.com/

Changes since v1:
- Fix commit subject and description
- Add cover letter to provide full context of implementation & history

Judith Mendez (1):
  arm64: dts: ti: k3-am654-base-board: Add power-off delay for proper
    MMC power cycle

 arch/arm64/boot/dts/ti/k3-am654-base-board.dts | 1 +
 1 file changed, 1 insertion(+)

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2.34.1