From: Hu Ziji <huziji@xxxxxxxxxxx>
Some vendor host, like Xenon, can support multiple types.
In dts, use mmc-card dt sub-node to indicate eMMC is in use.
Add a generic mmc-card parse function in mmc core layer.
If mmc-card sub-node is detected, set eMMC common caps, such as
MMC_CAP_NONREMOVABLE, MMC_CAP2_NO_SD and MMC_CAP2_NO_SDIO.
Since it is likely that struct mmc_card is not allocated yet when
this mmc-card parse function is called, it will return true if
mmc-card sub-node is detected. Otherwise, return false.
It can help vendor host determine if the card type is eMMC.
Signed-off-by: Hu Ziji <huziji@xxxxxxxxxxx>
Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/mmc.c | 24 ++++++++++++++++++++++++
include/linux/mmc/core.h | 2 ++
2 files changed, 26 insertions(+)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index b61b52f9da3d..dc480006a303 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -2111,6 +2111,30 @@ static const struct mmc_bus_ops mmc_ops = {
};
/*
+ * Parse mmc-card dt sub-node and set eMMC common caps
+ * if mmc-card exists.
+ * If mmc-card is detected, return true.
+ * Otherwise, return false.
+ */
+bool mmc_of_parse_mmc_card(struct mmc_host *host)
+{
+ struct device_node *np;
+ bool ret = false;
+
+ np = mmc_of_find_child_device(host, 0);
+ if (np && of_device_is_compatible(np, "mmc-card")) {
+ /* mmc-card sub-node indicates eMMC card is in use. */
+ host->caps |= MMC_CAP_NONREMOVABLE;
+ host->caps2 |= MMC_CAP2_NO_SDIO | MMC_CAP2_NO_SD;
+ ret = true;
+ }
+
+ of_node_put(np);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mmc_of_parse_mmc_card);
+
+/*
* Starting point for MMC card init.
*/
int mmc_attach_mmc(struct mmc_host *host)
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index e33cc748dcfe..1b27323f3b6e 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -234,4 +234,6 @@ struct device_node;
extern u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max);
extern int mmc_of_parse_voltage(struct device_node *np, u32 *mask);
+extern bool mmc_of_parse_mmc_card(struct mmc_host *host);
+
#endif /* LINUX_MMC_CORE_H */
--
git-series 0.9.1
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