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mmc: Register only the first MMC device on MMC_TINY

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When MMC_TINY is enabled, support for only one MMC device
is provided. Boards that register more than one device,
will just write over mmc_static keeping only the last one
registered.

This commit prevents this, keeping only the first MMC
device created. A debug warning message is added, if nothing
else, as a hint/documentation for developers.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
This commit is contained in:
Ezequiel Garcia 2019-05-25 19:25:22 -03:00 committed by Tom Rini
parent bf7c01d92b
commit d66fb5b1f6
1 changed files with 9 additions and 0 deletions
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9
drivers/mmc/mmc_legacy.c
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@ -150,6 +150,15 @@ struct mmc *mmc_create(const struct mmc_config *cfg, void *priv)
{
struct mmc *mmc = &mmc_static;
/* First MMC device registered, fail to register a new one.
* Given users are not expecting this to fail, instead
* of failing let's just return the only MMC device
*/
if (mmc->cfg) {
debug("Warning: MMC_TINY doesn't support multiple MMC devices\n");
return mmc;
}
mmc->cfg = cfg;
mmc->priv = priv;