arm/arm64: dts: adi: fix gpio-hog polarity on sc5xx boards

[jiez]

On SC573 EZLITE board, all MCP23017 expander enable signals are active-low. Replace GPIO_ACTIVE_HIGH with GPIO_ACTIVE_LOW throughout and change output-low/output-high accordingly to keep the previous default behavior.

Also add missing audio-jack-sel hog for SC573 EZLITE board.

For SC594/SC598 SOM EZKIT boards, remove audio-jack-sel hog, which is not on schematics, and fix mlb-en polarity.

PR Type

• Bug fix (a change that fixes an issue)
• New feature (a change that adds new functionality)
• Breaking change (a change that affects other repos or cause CIs to fail)

PR Checklist

• I have conducted a self-review of my own code changes
• I have compiled my changes, including the documentation
• I have tested the changes only on the SC598 SOM EZKIT board
• I have updated the documentation outside this repo accordingly
• I have provided links for the relevant upstream lore

[github-actions]

LLM review

This series fixes gpio-hog polarity descriptors on SC5xx evaluation boards, correcting GPIO_ACTIVE_HIGH→GPIO_ACTIVE_LOW annotations on MCP23017 expander pins while inverting output-high↔output-low to preserve physical pin states. It also adds a missing audio-jack-sel hog on the SC573 EZ-KIT and removes erroneous audio-jack-sel hogs from SC594/SC598 SOM EZ-KIT boards.

run: 28013128762

ebaaf08d - arm/arm64: dts: adi: fix gpio-hog polarity on sc5xx boards

The gpio-hog semantics were reviewed against drivers/gpio/gpiolib.c: output-low/output-high refer to logical levels; when GPIO_ACTIVE_LOW is set, gpiod_direction_output_nonotify() inverts the value, so ACTIVE_LOW + output-low → physical HIGH and ACTIVE_LOW + output-high → physical LOW. All signal transitions are verified to preserve the physical pin state.

The SC573 EZ-KIT schematic (adsp-sc573_ez-kit_schematic-rel_1-3.pdf) confirms:

• MLB3_EN is active-low (schematic: "MLB3_EN Low for Board Option 3") — physical HIGH default is correct.
• AUDIO_JACK_SEL is a level selector, not an active-low enable (schematic: "High for input") — GPIO_ACTIVE_HIGH + output-high producing physical HIGH (input mode) is intentional and correct.
• MCP23017 U47/U48 pin-to-signal mapping matches the DTS.

The commit description says "all MCP23017 expander enable signals are active-low" — this is slightly imprecise since audio-jack-sel on the SC573 deliberately uses GPIO_ACTIVE_HIGH, but it has no effect on correctness.

CI warnings

The dtc warnings for sc573-ezlite.dts (duplicate unit-address on core{1,2}-rproc, missing reg on sound, channel@N unit-address-vs-reg) and for sc598-som.dtsi are pre-existing structural issues at lines untouched by this patch. They are not introduced by this series.

Verification data

The SC573 EZ-KIT schematic (adsp-sc573_ez-kit_schematic-rel_1-3.pdf) was fetched from https://www.analog.com/media/en/technical-documentation/eval-board-schematic/ and extracted with PyMuPDF to verify signal polarities. DTBs were built clean for sc573-ezlite_defconfig (ARM), sc594-som-ezkit_defconfig (ARM), and sc598-som-ezkit_defconfig (AArch64) using the CI build toolchain — no errors, no new warnings.