mmc: add a function to get regulators, supplying card's power

Add a function to get regulators, supplying card's Vdd and Vccq on a
specific host. If a Vdd supplying regulator is found, the function checks,
whether a valid OCR mask can be obtained from it. The Vccq regulator is
optional. A failure to get it is not fatal.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 28b1ffaf0bd1..8d00aef9523e 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1022,6 +1022,29 @@ int mmc_regulator_set_ocr(struct mmc_host *mmc,
 }
 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr);
 
+int mmc_regulator_get_supply(struct mmc_host *mmc)
+{
+        struct device *dev = mmc_dev(mmc);
+        struct regulator *supply;
+        int ret;
+
+        supply = devm_regulator_get(dev, "vmmc");
+        mmc->supply.vmmc = supply;
+        mmc->supply.vqmmc = devm_regulator_get(dev, "vqmmc");
+
+        if (IS_ERR(supply))
+                return PTR_ERR(supply);
+
+        ret = mmc_regulator_get_ocrmask(supply);
+        if (ret > 0)
+                mmc->ocr_avail = ret;
+        else
+                dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
+
 #endif /* CONFIG_REGULATOR */
 
 /*