mmc: mxs-mmc: enable regulator for mmc slot

If bootloader or platform initialization code does not enable the
power supply to mmc slot, we need to do it in mmc driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 277161d279b8..2247c50f9869 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -707,6 +707,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
         struct pinctrl *pinctrl;
         int ret = 0, irq_err, irq_dma;
         dma_cap_mask_t mask;
+        struct regulator *reg_vmmc;
 
         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
@@ -747,6 +748,16 @@ static int mxs_mmc_probe(struct platform_device *pdev)
         host->mmc = mmc;
         host->sdio_irq_en = 0;
 
+        reg_vmmc = devm_regulator_get(&pdev->dev, "vmmc");
+        if (!IS_ERR(reg_vmmc)) {
+                ret = regulator_enable(reg_vmmc);
+                if (ret) {
+                        dev_err(&pdev->dev,
+                                "Failed to enable vmmc regulator: %d\n", ret);
+                        goto out_mmc_free;
+                }
+        }
+
         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
         if (IS_ERR(pinctrl)) {
                 ret = PTR_ERR(pinctrl);