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Date: Tue, 7 Nov 2017 07:45:44 +0100 (CET)
From: Stefan Wahren <stefan.wahren@...e.com>
To: Florian Fainelli <f.fainelli@...il.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, Ray Jui <rjui@...adcom.com>,
Eric Anholt <eric@...olt.net>,
Rob Herring <robh+dt@...nel.org>,
Steffen Trumtrar <s.trumtrar@...gutronix.de>,
Harald Freudenberger <freude@...ux.vnet.ibm.com>,
Russell King <rmk+kernel@...linux.org.uk>,
"moderated list:BROADCOM BCM2835 ARM ARCHITECTURE"
<linux-arm-kernel@...ts.infradead.org>,
PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
Scott Branden <sbranden@...adcom.com>,
"open list:HARDWARE RANDOM NUMBER GENERATOR CORE"
<linux-crypto@...r.kernel.org>, Martin Kaiser <martin@...ser.cx>,
Herbert Xu <herbert@...dor.apana.org.au>,
linux-kernel@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
"maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..."
<bcm-kernel-feedback-list@...adcom.com>,
Mark Rutland <mark.rutland@....com>,
"moderated list:BROADCOM BCM2835 ARM ARCHITECTURE"
<linux-rpi-kernel@...ts.infradead.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>, Sean Wang <sean.wang@...iatek.com>
Subject: Re: [PATCH 11/12] hwrng: bcm2835-rng: Enable BCM2835 RNG to work on
BCM63xx platforms
> Florian Fainelli <f.fainelli@...il.com> hat am 6. November 2017 um 21:16 geschrieben:
>
>
> On 11/04/2017 11:27 AM, Stefan Wahren wrote:
> > Hi Florian
> >
> >> Florian Fainelli <f.fainelli@...il.com> hat am 2. November 2017 um 02:04 geschrieben:
> >>
> >>
> >> We have now incorporated all necessary functionality for the BCM63xx
> >> platforms to successfully migrate over bcm2835-rng, so add the final
> >> bits: Kconfig selection and proper platform_device device type matching
> >> to keep the same platform device name for registration to work.
> >>
> >> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> >> ---
> >> drivers/char/hw_random/Kconfig | 7 ++++---
> >> drivers/char/hw_random/bcm2835-rng.c | 11 ++++++++++-
> >> 2 files changed, 14 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
> >> index 95a031e9eced..d0689cc8c7fc 100644
> >> --- a/drivers/char/hw_random/Kconfig
> >> +++ b/drivers/char/hw_random/Kconfig
> >> @@ -87,12 +87,13 @@ config HW_RANDOM_BCM63XX
> >> If unusure, say Y.
> >>
> >> config HW_RANDOM_BCM2835
> >> - tristate "Broadcom BCM2835 Random Number Generator support"
> >> - depends on ARCH_BCM2835 || ARCH_BCM_NSP || ARCH_BCM_5301X
> >> + tristate "Broadcom BCM2835/BCM63xx Random Number Generator support"
> >> + depends on ARCH_BCM2835 || ARCH_BCM_NSP || ARCH_BCM_5301X || \
> >> + ARCH_BCM_63XX || BCM63XX || BMIPS_GENERIC
> >> default HW_RANDOM
> >> ---help---
> >> This driver provides kernel-side support for the Random Number
> >> - Generator hardware found on the Broadcom BCM2835 SoCs.
> >> + Generator hardware found on the Broadcom BCM2835 and BCM63xx SoCs.
> >>
> >> To compile this driver as a module, choose M here: the
> >> module will be called bcm2835-rng
> >> diff --git a/drivers/char/hw_random/bcm2835-rng.c b/drivers/char/hw_random/bcm2835-rng.c
> >> index 650e0033c273..d9ffe14f312b 100644
> >> --- a/drivers/char/hw_random/bcm2835-rng.c
> >> +++ b/drivers/char/hw_random/bcm2835-rng.c
> >> @@ -131,6 +131,7 @@ static const struct of_device_id bcm2835_rng_of_match[] = {
> >> { .compatible = "brcm,bcm2835-rng"},
> >> { .compatible = "brcm,bcm-nsp-rng", .data = &nsp_rng_of_data },
> >> { .compatible = "brcm,bcm5301x-rng", .data = &nsp_rng_of_data },
> >> + { .compatible = "brcm,bcm6368-rng"},
> >> {},
> >> };
> >>
> >> @@ -164,7 +165,7 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
> >> if (IS_ERR(priv->clk))
> >> priv->clk = NULL;
> >>
> >> - priv->rng.name = "bcm2835-rng";
> >> + priv->rng.name = pdev->id_entry->name;
> >
> > this change breaks registration on bcm2835, because the name is NULL.
>
> OH right, I will fix that in v2, I am assuming that if you did something
> like this, things still work correctly for you on 2835:
>
> if (!priv->id_entry->name)
> priv->rng.name = "bcm2835-rng";
> else
> priv->rng.name = priv->id_entry->name;
>
> ?
I think that should work, but i'm not really happy about it. I prefer a more general solution. Looking at the other rng drivers shows the following pattern:
priv->rng.name = pdev->name;
I need to verify this on bcm2835.
>
> >
> > Regards
> > Stefan
> >
> >> priv->rng.init = bcm2835_rng_init;
> >> priv->rng.read = bcm2835_rng_read;
> >> priv->rng.cleanup = bcm2835_rng_cleanup;
> >> @@ -190,12 +191,20 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
> >>
> >> MODULE_DEVICE_TABLE(of, bcm2835_rng_of_match);
> >>
> >> +static struct platform_device_id bcm2835_rng_devtype[] = {
> >> + { .name = "bcm2835-rng" },
> >> + { .name = "bcm63xx-rng" },
> >> + { /* sentinel */ }
> >> +};
> >> +MODULE_DEVICE_TABLE(platform, bcm2835_rng_devtype);
> >> +
> >> static struct platform_driver bcm2835_rng_driver = {
> >> .driver = {
> >> .name = "bcm2835-rng",
> >> .of_match_table = bcm2835_rng_of_match,
> >> },
> >> .probe = bcm2835_rng_probe,
> >> + .id_table = bcm2835_rng_devtype,
> >> };
> >> module_platform_driver(bcm2835_rng_driver);
> >>
> >> --
> >> 2.9.3
> >>
> >>
> >> _______________________________________________
> >> linux-arm-kernel mailing list
> >> linux-arm-kernel@...ts.infradead.org
> >> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
>
> --
> Florian
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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