DT510: TAS6424 — lab validation, rails, GPIOs, TDM vs I2S (Tier C2)

[ajlennon]

Parent tracking

Sub-issue of #2 (DT510 BSP bring-up plan).

Scope (Tier C2 — step 1)

Complete TAS6424 class-D bring-up: lab validation, rails, GPIOs, and TDM vs stereo I2S product decision.

Hardware input (@ohull456 + Google Doc, 2026-04-14)

Power (DVDD / VBAT / PVDD): Always-on — no SW sequencing; DTS uses fixed regulators (vddext, tas6424_hi_rail); 12 V / 3.3 V placeholders — confirm vs schematic (@ohull456).

Outputs (codec driver): standby-gpios = GPIO1_IO10 (AMP_STBY#), mute-gpios = GPIO1_IO11 (AMP_MUTE#), active-low — in DTS as &gpio1 10/11 + pinctrl_tas6424_gpio (commit 0fca95f on main).

Inputs (not in ti,tas6424 driver): GPIO1_IO12 (AMP_FAULT#), GPIO1_IO13 (AMP_WARN#) — muxed with pinctrl; Linux driver polls faults via I2C. Optional later: gpio-keys or IRQ consumer if product wants pin-level monitoring.

DAI format: I2S first; TDM deferred.

Deferred (low priority): I2C3 GPIO for charger IRQ / HDMI.

Current state

• DTS: tas6424@6a has pinctrl, standby / mute GPIOs; tas6424_hi_rail still placeholder voltage — confirm with Ollie.

Work

• Lab: validate audio on prototype hardware; dmesg / probe for tas6424.
• DT: confirm tas6424_hi_rail / vddext µV vs BOM.
• Lock DAI format — I2S first; TDM only if product revisits.
• Acceptance: stable playback; DT510: BSP bring-up plan (device tree, kernel, phased tiers) #2 Implementation / Lab templates.

References

• docs/DT510-BSP-PROJECT-PLAN.md §5 C2
• Google Doc pinmux: MX8MM_IOMUXC_GPIO1_IO10_GPIO1_IO10 … GPIO1_IO13 (aligned with docs/reference/dt510-ollie-tool-generated/pin_mux.dts)

Assignees

Per parent #2: @ajlennon @ohull456

[ajlennon]

Updated with @ohull456 hardware notes from #2 (2026-04-13): always-on rails; AMP_STBY# / AMP_MUTE# high for run — ball→GPIO still needed for standby-gpios / mute-gpios. Follow-up request posted on parent #2.

[ajlennon]

DTS landed: tas6424@6a now has pinctrl_tas6424_gpio, standby-gpios (GPIO1_IO10), mute-gpios (GPIO1_IO11) per Google Doc — commit 0fca95f on main. FAULT/WARN pins muxed; driver still uses I²C fault polling.