Commit a1b03e7a authored by Gatien Chevallier's avatar Gatien Chevallier Committed by Herbert Xu
Browse files

hwrng: stm32 - support RNG configuration locking mechanism 



If "st,rng-lock-conf" DT binding property is set for a stm32-rng node,
the RNG configuration will be locked until next hardware block reset
or platform reset.

Signed-off-by: default avatarGatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 28d13f3f

drivers/char/hw_random/stm32-rng.c

+5 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ struct stm32_rng_private { 
	struct reset_control *rst;

	const struct stm32_rng_data *data;

	bool ced;

	bool lock_conf;

};



/*
@@ -301,6 +302,9 @@ static int stm32_rng_init(struct hwrng *rng) 


		reg &= ~RNG_CR_CONDRST;

		reg |= RNG_CR_RNGEN;

		if (priv->lock_conf)

			reg |= RNG_CR_CONFLOCK;



		writel_relaxed(reg, priv->base + RNG_CR);



		err = readl_relaxed_poll_timeout_atomic(priv->base + RNG_CR, reg,
@@ -439,6 +443,7 @@ static int stm32_rng_probe(struct platform_device *ofdev) 
	}



	priv->ced = of_property_read_bool(np, "clock-error-detect");

	priv->lock_conf = of_property_read_bool(np, "st,rng-lock-conf");



	priv->data = of_device_get_match_data(dev);

	if (!priv->data)