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mmc: introduce mmc_power_init

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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.fan@nxp.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Peng Fan 2016-10-11 15:08:43 +08:00 committed by Jaehoon Chung
parent b03380805b
commit 2051aefe71
1 changed files with 29 additions and 1 deletions
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30
drivers/mmc/mmc.c
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@ -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 */