In device tree, there is vmmc-supply property for SD/MMC.
Introduce mmc_power_init function to handle vmmc-supply.
mmc_power_init will first invoke board_mmc_power_init to
avoid break boards which already implement board_mmc_power_init.
If DM_MMC and DM_REGULATOR is defined, the regulator
will be enabled to power up the device.
Signed-off-by: Peng Fan <peng....@nxp.com>
Cc: Jaehoon Chung <jh80.ch...@samsung.com>
---
V2:
Change function prototype to static.
Use puts to replace debug, when no vmmc-supply.
V1: Use a generic way to handle vmmc supply, but not let vendor driver
to handle it.
The RFC patset thread:
http://lists.denx.de/pipermail/u-boot/2016-April/251019.html
drivers/mmc/mmc.c | 30 +++++++++++++++++++++++++++++-
1 file changed, 29 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 0312da9..320413a 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -15,6 +15,7 @@
#include <errno.h>
#include <mmc.h>
#include <part.h>
+#include <power/regulator.h>
#include <malloc.h>
#include <memalign.h>
#include <linux/list.h>
@@ -1582,6 +1583,31 @@ __weak void board_mmc_power_init(void)
{
}
+static int mmc_power_init(struct mmc *mmc)
+{
+ board_mmc_power_init();
+
+#if defined(CONFIG_DM_MMC) && defined(CONFIG_DM_REGULATOR) && \
+ !defined(CONFIG_SPL_BUILD)
+ struct udevice *vmmc_supply;
+ int ret;
+
+ ret = device_get_supply_regulator(mmc->dev, "vmmc-supply",
+ &vmmc_supply);
+ if (ret) {
+ puts("No vmmc supply\n");
+ return 0;
+ }
+
+ ret = regulator_set_enable(vmmc_supply, true);
+ if (ret) {
+ puts("Error enabling VMMC supply\n");
+ return ret;
+ }
+#endif
+ return 0;
+}
+
int mmc_start_init(struct mmc *mmc)
{
bool no_card;
@@ -1606,7 +1632,9 @@ int mmc_start_init(struct mmc *mmc)
#ifdef CONFIG_FSL_ESDHC_ADAPTER_IDENT
mmc_adapter_card_type_ident();
#endif
- board_mmc_power_init();
+ err = mmc_power_init(mmc);
+ if (err)
+ return err;
#ifdef CONFIG_DM_MMC_OPS
/* The device has already been probed ready for use */
--
2.6.2
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