ARM: 6137/1: nomadik hwrng: Add clock support

This adds the clock support to the Nomadik RNG driver

Signed-off-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Linus walleij <linus.walleij@stericsson.com>
Acked-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 18 insertions, 0 deletions

diff --git a/arch/arm/mach-nomadik/clock.c b/arch/arm/mach-nomadik/clock.c
index 60f5bee09f2e..2c471fc451d7 100644
--- a/arch/arm/mach-nomadik/clock.c
+++ b/arch/arm/mach-nomadik/clock.c
@@ -56,6 +56,7 @@ static struct clk_lookup lookups[] = {
         CLK(&clk_default, "gpio.1"),
         CLK(&clk_default, "gpio.2"),
         CLK(&clk_default, "gpio.3"),
+        CLK(&clk_default, "rng"),
 };
 
 static int __init clk_init(void)
diff --git a/drivers/char/hw_random/nomadik-rng.c b/drivers/char/hw_random/nomadik-rng.c
index a8b4c4010144..a348c7e9aa0b 100644
--- a/drivers/char/hw_random/nomadik-rng.c
+++ b/drivers/char/hw_random/nomadik-rng.c
@@ -15,6 +15,10 @@
 #include <linux/amba/bus.h>
 #include <linux/hw_random.h>
 #include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+static struct clk *rng_clk;
 
 static int nmk_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
 {
@@ -40,6 +44,15 @@ static int nmk_rng_probe(struct amba_device *dev, struct amba_id *id)
         void __iomem *base;
         int ret;
 
+        rng_clk = clk_get(&dev->dev, NULL);
+        if (IS_ERR(rng_clk)) {
+                dev_err(&dev->dev, "could not get rng clock\n");
+                ret = PTR_ERR(rng_clk);
+                return ret;
+        }
+
+        clk_enable(rng_clk);
+
         ret = amba_request_regions(dev, dev->dev.init_name);
         if (ret)
                 return ret;
@@ -57,6 +70,8 @@ out_unmap:
         iounmap(base);
 out_release:
         amba_release_regions(dev);
+        clk_disable(rng_clk);
+        clk_put(rng_clk);
         return ret;
 }
 
@@ -66,6 +81,8 @@ static int nmk_rng_remove(struct amba_device *dev)
         hwrng_unregister(&nmk_rng);
         iounmap(base);
         amba_release_regions(dev);
+        clk_disable(rng_clk);
+        clk_put(rng_clk);
         return 0;
 }