(nuttx) 05/05: docs/sdio: add reference to card initialization flowchart

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commit 3d14873faabd0c7ba2325cdbfe4b2391360cc425
Author: Arjav Patel <ar...@gmail.com>
AuthorDate: Tue Mar 17 21:42:43 2026 +0530

    docs/sdio: add reference to card initialization flowchart
    
    This update enhances the SDIO documentation by including a reference to the card initialization flowchart in the MMC/SD physical layer specification. This addition aims to provide implementers with a clearer understanding of the complete card initialization and command sequence.
    
    Signed-off-by: Arjav Patel <ar...@gmail.com>
---
 Documentation/components/drivers/special/sdio.rst | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/components/drivers/special/sdio.rst b/Documentation/components/drivers/special/sdio.rst
index 876b6fea2a0..6822b82d388 100644
--- a/Documentation/components/drivers/special/sdio.rst
+++ b/Documentation/components/drivers/special/sdio.rst
@@ -53,6 +53,10 @@ lower-half, a simplified interaction around CMD9 looks like this:
 3. ``SDIO_RECVR2``: Retrieve the 136-bit response and provide the
    decoded 128-bit CID/CSD payload to the MMCSD upper-half.
 
+For the complete card initialization and command sequence, refer to the
+card initialization flowchart in the MMC/SD physical layer
+specification.
+
 R2 (136-bit) response and CSD/CID
 ---------------------------------