Refactor platform variant management and detection

[nchapman]

No description provided.

[Copilot]

Pull request overview

This PR refactors the platform variant management system to provide a unified, table-driven approach for detecting and configuring hardware variants across different handheld gaming devices. The refactor replaces ad-hoc global is_* boolean flags with a centralized PlatformVariant structure and detection framework.

Key changes:

• Introduces shared platform_variant.h/c with unified detection API and device registry system
• Migrates three multi-variant platforms (rg35xxplus, miyoomini, tg5040) to use structured device/variant/mapping tables
• Updates eight single-variant platforms with standardized documentation headers and variant detection sections
• Provides convenience macros (VARIANT_IS(), HAS_FEATURE()) for cleaner variant and feature checking

Reviewed changes

Copilot reviewed 23 out of 23 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
workspace/all/common/platform_variant.h	New core header defining PlatformVariant structure, VariantType enum, DeviceInfo struct, hardware feature flags, and detection API
workspace/all/common/platform_variant.c	Global platform_variant instance and PLAT_getDeviceName() implementation with null-safe fallbacks
workspace/all/common/build.mk	Adds platform_variant.c to common source list for build system
workspace/all/minui/makefile	Includes platform_variant.c in minui build sources
workspace/all/minarch/makefile	Includes platform_variant.c in minarch build sources
workspace/tg5040/platform/platform.h	Defines TG5040 variant constants, includes platform_variant.h, migrates macros to use platform_variant fields
workspace/tg5040/platform/platform.c	Implements device registry, variant config table, device mapping, and PLAT_detectVariant() for standard/Brick detection
workspace/rg35xxplus/platform/platform.h	Defines RG35XX family variants (VGA/Square/Wide), migrates display/feature macros to platform_variant
workspace/rg35xxplus/platform/platform.c	Implements detection for 9 devices across 3 variants with HDMI override, replaces PLAT_getModel() with PLAT_getDeviceName()
workspace/miyoomini/platform/platform.h	Defines Mini family variants, uses HAS_FEATURE() for button mappings, uses variant comparison for Plus detection
workspace/miyoomini/platform/platform.c	Implements PMIC/560p detection, special MY285 Flip handling, replaces PLAT_getModel() with PLAT_getDeviceName()
workspace/zero28/platform/platform.h	Updates header doc to standardized format with SoC info, adds variant detection section comment
workspace/trimuismart/platform/platform.h	Updates header doc to standardized format, adds variant detection section comment
workspace/rgb30/platform/platform.h	Corrects manufacturer to PowKiddy, updates header doc, adds variant detection section
workspace/rg35xx/platform/platform.h	Updates header doc with SoC info and clarification note about RG35XX vs RG35XX Plus, adds variant detection section
workspace/my355/platform/platform.h	Updates header doc with device name and SoC info, adds clarification note about similar platforms
workspace/my282/platform/platform.h	Updates header doc to use Miyoo A30 name with SoC info, adds variant detection section
workspace/magicmini/platform/platform.h	Updates header doc to standardized format, adds variant detection section comment
workspace/m17/platform/platform.h	Updates header doc to standardized format, adds variant detection section comment
docs/platform-variants.md	Comprehensive 269-line documentation covering architecture, usage patterns, detection methods, and migration guide

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