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Commit 7a794a73 authored by Heiner Kallweit's avatar Heiner Kallweit Committed by Herbert Xu
Browse files

hwrng: meson - add clock handling to driver 



Add handling of RNG0 clock to the driver.

Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 1b3f6d14

drivers/char/hw_random/meson-rng.c

+22 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ 
#include <linux/slab.h>

#include <linux/types.h>

#include <linux/of.h>

#include <linux/clk.h>



#define RNG_DATA 0x00
@@ -69,6 +70,7 @@ struct meson_rng_data { 
	void __iomem *base;

	struct platform_device *pdev;

	struct hwrng rng;

	struct clk *core_clk;

};



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);

}



static void meson_rng_clk_disable(void *data)

{

	clk_disable_unprepare(data);

}



static int meson_rng_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct meson_rng_data *data;

	struct resource *res;

	int ret;



	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);

	if (!data)
@@ -98,6 +106,20 @@ static int meson_rng_probe(struct platform_device *pdev) 
	if (IS_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.read = meson_rng_read;