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 ---
The RFC patset thread: http://lists.denx.de/pipermail/u-boot/2016-April/251019.html V1: Use a generic way to handle vmmc supply, but not let vendor driver to handle it.
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..c361098 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) { }
+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) { + debug("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 */