linux-kernel - Re: [PATCH 12/12] hwrng: bcm63xx-rng: Remove since bcm2835-rng takes over

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Date:   Fri, 3 Nov 2017 14:58:32 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Eric Anholt <eric@...olt.net>, linux-kernel@...r.kernel.org
Cc:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        Stefan Wahren <stefan.wahren@...e.com>,
        PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Harald Freudenberger <freude@...ux.vnet.ibm.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Martin Kaiser <martin@...ser.cx>,
        Steffen Trumtrar <s.trumtrar@...gutronix.de>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BRO ADCOM BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 12/12] hwrng: bcm63xx-rng: Remove since bcm2835-rng takes
 over

On 11/03/2017 01:18 PM, Eric Anholt wrote:
> Florian Fainelli <f.fainelli@...il.com> writes:
> 
>> bcm2835-rng is now capable of supporting the BCM63xx hardware, so remove
>> the driver which duplicates the same functionality.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
>> ---
>>  drivers/char/hw_random/Kconfig       |  13 ---
>>  drivers/char/hw_random/Makefile      |   1 -
>>  drivers/char/hw_random/bcm63xx-rng.c | 154 -----------------------------------
>>  3 files changed, 168 deletions(-)
>>  delete mode 100644 drivers/char/hw_random/bcm63xx-rng.c
>>
> 
>> diff --git a/drivers/char/hw_random/bcm63xx-rng.c b/drivers/char/hw_random/bcm63xx-rng.c
>> deleted file mode 100644
>> index 5132c9cde50d..000000000000
>> --- a/drivers/char/hw_random/bcm63xx-rng.c
>> +++ /dev/null
> 
>> -static int bcm63xx_rng_data_present(struct hwrng *rng, int wait)
>> -{
>> -	struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
>> -
>> -	return __raw_readl(priv->regs + RNG_STAT) & RNG_AVAIL_MASK;
>> -}
> 
> It looks like this method isn't in the 2835 implementation.  Should it
> get ported over?

The read method already has something similar in that it busy loops
until it gets some random words available, which is why I did not port
it over.
-- 
Florian