linux-drivers/
drivers/mmc/core

MMC/SD/SDIO subsystem core

The shared framework code that sits between Linux and the many host controllers and card drivers handling MMC, SD, and SDIO storage and I/O cards. It implements the protocol, card discovery, power sequencing, and bus management that every SD card reader and eMMC chip on a Linux system relies on.

not-a-driver conf=1.00 deploy=none replacement=none subsystem=mmc category=not-a-driver
100%

recommendation

This is not actually a hardware driver; it is the common core of the MMC/SD/SDIO subsystem that all individual host and card drivers build on. Removing or deprecating it is not on the table — it is foundational infrastructure for any system with an SD card slot or eMMC.

repository signals

44 files
25,950 source lines
333 commits, 5y
+5,301 / −1,908 lines added / removed, 5y
118 authors, 5y
monthly commits · 2021-04-21 → 2026-04-21 · 333 total · active in 58/61 months
2021 2022 2023 2024 2025 2026 2021-04: 4 commits · +67 −19 2021-05: 21 commits · +640 −183 2021-06: 11 commits · +80 −75 2021-07: 9 commits · +69 −74 2021-08: 11 commits · +162 −126 2021-09: 4 commits · +34 −18 2021-10: 3 commits · +31 −22 2021-11: 13 commits · +158 −67 2021-12: 4 commits · +18 −14 2022-01: 1 commit · +7 −1 2022-02: 4 commits · +55 −60 2022-03: 7 commits · +102 −31 2022-04: 10 commits · +74 −25 2022-05: 5 commits · +90 −4 2022-06: 3 commits · +2 −3 2022-07: 7 commits · +49 −33 2022-08: 4 commits · +26 −36 2022-09: 2 commits · +19 −2 2022-10: 8 commits · +47 −29 2022-11: 8 commits · +37 −33 2022-12: 1 commit · +2 −2 2023-01: 8 commits · +29 −30 2023-02: 5 commits · +66 −12 2023-03: 5 commits · +66 −13 2023-04: 2 commits · +5 −2 2023-05: 5 commits · +48 −28 2023-06: 6 commits · +55 −26 2023-07: 4 commits · +9 −12 2023-08: 7 commits · +30 −20 2023-09: 5 commits · +77 −20 2023-10: 2 commits · +17 −11 2023-11: 5 commits · +53 −6 2023-12: 8 commits · +64 −26 2024-01: 3 commits · +10 −12 2024-02: 9 commits · +70 −59 2024-03: 9 commits · +23 −18 2024-04: 4 commits · +79 −31 2024-05: 1 commit · +2 −2 2024-06: 5 commits · +37 −33 2024-07: 1 commit · +5 −5 2024-08: 4 commits · +271 −22 2024-09: 14 commits · +532 −166 2024-10: 17 commits · +1,322 −128 2024-11: 7 commits · +50 −43 2024-12: 1 commit · +1 −1 2025-01: 1 commit · +0 −12 2025-02: 2 commits · +10 −3 2025-03: 4 commits · +43 −11 2025-04: 17 commits · +131 −109 2025-05: 7 commits · +27 −27 2025-06: 2 commits · +4 −7 2025-07: 3 commits · +6 −3 2025-08: 8 commits · +280 −25 2025-09: 4 commits · +21 −24 2025-10: 2 commits · +9 −51 2025-11: 3 commits · +18 −15 2025-12: 0 commits · +0 −0 2026-01: 1 commit · +25 −0 2026-02: 2 commits · +37 −38 2026-03: 0 commits · +0 −0 2026-04: 0 commits · +0 −0

sources

No sources cited.

codex reasoning notes (technical)

Not a driver directory: MMC subsystem core/framework code shared by many host and card drivers, not a hardware-specific driver.