hwrng: meson - add clock handling to driver
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>
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Родитель
1b3f6d1486
Коммит
7a794a73d4
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@ -62,6 +62,7 @@
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/of.h>
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#include <linux/clk.h>
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#define RNG_DATA 0x00
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@ -69,6 +70,7 @@ struct meson_rng_data {
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void __iomem *base;
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struct platform_device *pdev;
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struct hwrng rng;
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struct clk *core_clk;
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};
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static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
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@ -81,11 +83,17 @@ static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
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return sizeof(u32);
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}
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static void meson_rng_clk_disable(void *data)
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{
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clk_disable_unprepare(data);
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}
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static int meson_rng_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct meson_rng_data *data;
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struct resource *res;
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int ret;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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@ -98,6 +106,20 @@ static int meson_rng_probe(struct platform_device *pdev)
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if (IS_ERR(data->base))
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return PTR_ERR(data->base);
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data->core_clk = devm_clk_get(dev, "core");
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if (IS_ERR(data->core_clk))
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data->core_clk = NULL;
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if (data->core_clk) {
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ret = clk_prepare_enable(data->core_clk);
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if (ret)
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return ret;
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ret = devm_add_action_or_reset(dev, meson_rng_clk_disable,
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data->core_clk);
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if (ret)
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return ret;
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}
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data->rng.name = pdev->name;
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data->rng.read = meson_rng_read;
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