arjav1528 commented on code in PR #18543:
URL: https://github.com/apache/nuttx/pull/18543#discussion_r2945523428
##########
Documentation/components/drivers/special/sdio.rst:
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@@ -31,3 +31,36 @@ SDIO Device Drivers
- **Examples**: ``arch/arm/src/stm32/stm32_sdio.c`` and
``drivers/mmcsd/mmcsd_sdio.c``
+
+Implementing an SDIO lower-half
+===============================
+
+When implementing a new SDMMC controller driver (SDIO lower-half), it must
+provide the interface defined in ``struct sdio_dev_s``.
+
+Call-flow
+---------
+
+The MMCSD upper-half (``drivers/mmcsd/mmcsd_sdio.c``) interacts with the
+lower-half by sending commands and receiving responses:
+
+1. ``SDIO_SENDCMD``: Send the command (e.g., CMD2, CMD9).
Review Comment:
correct, the original list read like a full call flow, but my intent was to
only sketch the minimal interaction around CMD9/R2 and the CSD that the SDIO
lower-half must return, however I'll update push them
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