[PATCHv2] mmc: atmel-mci: add vmmc-supply support

[Alexandre Belloni]

Other MMC hosts handle a regulator named vmmc-supply that allows to power the
MMC card or SDIO device before communicating on the bus.

Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
---

Changes in v2:
 - use mmc_regulator_get_supply instead of devm_regulator_get

 drivers/mmc/host/atmel-mci.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 69e438e..4ea5333 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -23,6 +23,7 @@
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 #include <linux/scatterlist.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
@@ -2198,6 +2199,14 @@ static int __init atmci_init_slot(struct atmel_mci *host,
 	host->slot[id] = slot;
 	mmc_add_host(mmc);
 
+	mmc_regulator_get_supply(mmc);
+	if (!IS_ERR(mmc->supply.vmmc)) {
+		int ret = regulator_enable(mmc->supply.vmmc);
+		if (ret)
+			dev_err(&mmc->class_dev,
+				"failed to enable regulator: %d\n", ret);
+	}
+
 	if (gpio_is_valid(slot->detect_pin)) {
 		int ret;
 
-- 
1.8.1.2

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