ARM: Orion: SDIO: Add support for clk.
Some orion devices can gate the SDIO clock. If the clock exists,
enable/disable it as appropriate.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
index eeb8cd1..3b9136c 100644
--- a/drivers/mmc/host/mvsdio.c
+++ b/drivers/mmc/host/mvsdio.c
@@ -19,6 +19,7 @@
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
#include <linux/irq.h>
+#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/mmc/host.h>
@@ -51,6 +52,7 @@
struct device *dev;
struct resource *res;
int irq;
+ struct clk *clk;
int gpio_card_detect;
int gpio_write_protect;
};
@@ -770,6 +772,13 @@
} else
host->irq = irq;
+ /* Not all platforms can gate the clock, so it is not
+ an error if the clock does not exists. */
+ host->clk = clk_get(&pdev->dev, NULL);
+ if (!IS_ERR(host->clk)) {
+ clk_prepare_enable(host->clk);
+ }
+
if (mvsd_data->gpio_card_detect) {
ret = gpio_request(mvsd_data->gpio_card_detect,
DRIVER_NAME " cd");
@@ -854,6 +863,11 @@
mvsd_power_down(host);
iounmap(host->base);
release_resource(host->res);
+
+ if (!IS_ERR(host->clk)) {
+ clk_disable_unprepare(host->clk);
+ clk_put(host->clk);
+ }
mmc_free_host(mmc);
}
platform_set_drvdata(pdev, NULL);