[PATCH 4/4] sdhci-s3c: add regulator support

[Marek Szyprowski]

This patch adds support for regulator API to sdhci-s3c driver. Regulators
can be used to disable power in suspended state to reduce dissipated
energy.

Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
 drivers/mmc/host/sdhci-s3c.c |   30 +++++++++++++++++++++++++++++-
 1 files changed, 29 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 606e695..b9d46a5 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -19,6 +19,7 @@
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/gpio.h>
+#include <linux/regulator/consumer.h>
 
 #include <linux/mmc/host.h>
 
@@ -50,6 +51,7 @@ struct sdhci_s3c {
 
        struct clk              *clk_io;
        struct clk              *clk_bus[MAX_BUS_CLK];
+       struct regulator        *vmmc;
 };
 
 static inline struct sdhci_s3c *to_s3c(struct sdhci_host *host)
@@ -309,6 +311,13 @@ static int __devinit sdhci_s3c_probe(struct 
platform_device *pdev)
 
        platform_set_drvdata(pdev, host);
 
+       sc->vmmc = regulator_get(dev, "vmmc");
+       if (IS_ERR(sc->vmmc)) {
+               dev_warn(dev, "no vmmc regulator found\n");
+               sc->vmmc = NULL;
+       } else
+               regulator_enable(sc->vmmc);
+
        sc->clk_io = clk_get(dev, "hsmmc");
        if (IS_ERR(sc->clk_io)) {
                dev_err(dev, "failed to get io clock\n");
@@ -482,6 +491,11 @@ static int __devexit sdhci_s3c_remove(struct 
platform_device *pdev)
        clk_disable(sc->clk_io);
        clk_put(sc->clk_io);
 
+       if (sc->vmmc) {
+               regulator_disable(sc->vmmc);
+               regulator_put(sc->vmmc);
+       }
+
        iounmap(host->ioaddr);
        release_resource(sc->ioarea);
        kfree(sc->ioarea);
@@ -496,15 +510,29 @@ static int __devexit sdhci_s3c_remove(struct 
platform_device *pdev)
 
 static int sdhci_s3c_suspend(struct platform_device *dev, pm_message_t pm)
 {
+       int ret = 0;
        struct sdhci_host *host = platform_get_drvdata(dev);
+       struct sdhci_s3c *sc = sdhci_priv(host);
 
        sdhci_suspend_host(host, pm);
-       return 0;
+
+       if (sc->vmmc)
+               ret = regulator_disable(sc->vmmc);
+
+       return ret;
 }
 
 static int sdhci_s3c_resume(struct platform_device *dev)
 {
        struct sdhci_host *host = platform_get_drvdata(dev);
+       struct sdhci_s3c *sc = sdhci_priv(host);
+
+       if (sc->vmmc) {
+               int ret = regulator_disable(sc->vmmc);
+               if (ret)
+                       return ret;
+               mdelay(2);
+       }
 
        sdhci_resume_host(host);
        return 0;
-- 
1.7.1.569.g6f426

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