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hwrng: meson - add clock handling to driver

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Add handling of RNG0 clock to the driver.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Heiner Kallweit 2017-02-22 08:02:31 +01:00 committed by Herbert Xu
parent 1b3f6d1486
commit 7a794a73d4
1 changed files with 22 additions and 0 deletions
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22
drivers/char/hw_random/meson-rng.c
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@ -62,6 +62,7 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/types.h> #include <linux/types.h>
#include <linux/of.h> #include <linux/of.h>
#include <linux/clk.h>
#define RNG_DATA 0x00 #define RNG_DATA 0x00
@ -69,6 +70,7 @@ struct meson_rng_data {
void __iomem *base; void __iomem *base;
struct platform_device *pdev; struct platform_device *pdev;
struct hwrng rng; struct hwrng rng;
struct clk *core_clk;
}; };
static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
@ -81,11 +83,17 @@ static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
return sizeof(u32); return sizeof(u32);
} }
static void meson_rng_clk_disable(void *data)
{
clk_disable_unprepare(data);
}
static int meson_rng_probe(struct platform_device *pdev) static int meson_rng_probe(struct platform_device *pdev)
{ {
struct device *dev = &pdev->dev; struct device *dev = &pdev->dev;
struct meson_rng_data *data; struct meson_rng_data *data;
struct resource *res; struct resource *res;
int ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data) if (!data)
@ -98,6 +106,20 @@ static int meson_rng_probe(struct platform_device *pdev)
if (IS_ERR(data->base)) if (IS_ERR(data->base))
return PTR_ERR(data->base); return PTR_ERR(data->base);
data->core_clk = devm_clk_get(dev, "core");
if (IS_ERR(data->core_clk))
data->core_clk = NULL;
if (data->core_clk) {
ret = clk_prepare_enable(data->core_clk);
if (ret)
return ret;
ret = devm_add_action_or_reset(dev, meson_rng_clk_disable,
data->core_clk);
if (ret)
return ret;
}
data->rng.name = pdev->name; data->rng.name = pdev->name;
data->rng.read = meson_rng_read; data->rng.read = meson_rng_read;