[U-Boot] [PATCH V3 08/11] MMC: add weak function to detect MMC/SD card

[Stefano Babic]

Most controllers can check if there is a card in the slot.
However, they require pins that could be not available because
required by other functions and the detection of a card must
be performed in another way. This patch adds a weak function
that a board can implement to add its internal custom way
to check the presence of a MMC/SD card.

Signed-off-by: Stefano Babic <sbabic at denx.de>
---
 drivers/mmc/mmc.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index d91b9b7..3679225 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -36,6 +36,13 @@
 static struct list_head mmc_devices;
 static int cur_dev_num = -1;
 
+int __board_mmc_getcd(u8 *cd, struct mmc *mmc) {
+	return -1;
+}
+
+int board_mmc_getcd(u8 *cd, struct mmc *mmc)__attribute__((weak,
+	alias("__board_mmc_getcd")));
+
 int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 {
 	return mmc->send_cmd(mmc, cmd, data);
-- 
1.6.3.3