driver/mmcsd: add option to support SD/MMC PHYs that only run in 4-bit mode

2026-06-08 01:42:58 +08:00 · 2022-03-24 14:56:40 +11:00
parent d557b87b25
commit 163e3fd93c
2 changed files with 25 additions and 5 deletions
@@ -477,6 +477,7 @@
 #define SDIO_CAPS_DMABEFOREWRITE  0x04 /* Bit 2=1: Executes DMA before write command */
 #define SDIO_CAPS_4BIT            0x08 /* Bit 3=1: Supports 4 bit operation */
 #define SDIO_CAPS_8BIT            0x10 /* Bit 4=1: Supports 8 bit operation */
+#define SDIO_CAPS_4BIT_ONLY       0x20 /* Bit 5=1: Supports 4-bit only operation */

 /****************************************************************************
 * Name: SDIO_STATUS