linux-kernel - Re: [PATCH v3 5/5] hwrng: imx-rngc: enable driver for i.MX6

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Date:   Tue, 14 Jul 2020 17:27:39 +0300
From:   Horia Geantă <horia.geanta@....com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Rob Herring <robh+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Martin Kaiser <martin@...ser.cx>,
        Marco Felsch <m.felsch@...gutronix.de>,
        Franck Lenormand <franck.lenormand@....com>,
        Iuliana Prodan <iuliana.prodan@....com>,
        Silvano Di Ninno <silvano.dininno@....com>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 5/5] hwrng: imx-rngc: enable driver for i.MX6

On 7/14/2020 3:48 PM, Arnd Bergmann wrote:
> On Tue, Jul 14, 2020 at 2:39 PM Horia Geantă <horia.geanta@....com> wrote:
>> diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
>> index 8478eb757f3c..98f95a09ce55 100644
>> --- a/drivers/char/hw_random/Kconfig
>> +++ b/drivers/char/hw_random/Kconfig
>> @@ -255,7 +255,7 @@ config HW_RANDOM_MXC_RNGA
>>  config HW_RANDOM_IMX_RNGC
>>         tristate "Freescale i.MX RNGC Random Number Generator"
>>         depends on HAS_IOMEM && HAVE_CLK
>> -       depends on SOC_IMX25 || COMPILE_TEST
>> +       depends on SOC_IMX25 || SOC_IMX6SL || SOC_IMX6SLL || SOC_IMX6UL || COMPILE_TEST
>>         default HW_RANDOM
> 
> Are these the only chips that have it? If other i.MX variations have
> the same block,
> or might have it in the future, maybe just generialize the dependency
> to SOC_IMX6
> or ARCH_IMX?
> 
Fabio also suggested this during v1, see discussion here:
https://lore.kernel.org/linux-crypto/292aafd1-7249-5b76-ccc3-77b153594ef9@nxp.com

The SoC list is relatively stable, to the best of my knowledge.

>> diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
>> index 9c47e431ce90..84576d2fbf8c 100644
>> --- a/drivers/char/hw_random/imx-rngc.c
>> +++ b/drivers/char/hw_random/imx-rngc.c
>> @@ -350,6 +350,9 @@ static SIMPLE_DEV_PM_OPS(imx_rngc_pm_ops, imx_rngc_suspend, imx_rngc_resume);
>>
>>  static const struct of_device_id imx_rngc_dt_ids[] = {
>>         { .compatible = "fsl,imx25-rngb", .data = NULL, },
>> +       { .compatible = "fsl,imx6sl-rngb", .data = NULL, },
>> +       { .compatible = "fsl,imx6sll-rngb", .data = NULL, },
>> +       { .compatible = "fsl,imx6ull-rngb", .data = NULL, },
>>         { /* sentinel */ }
> 
> In the .dts file you describe the devices as compatible with fsl,imx25-rngb,
> so this change is not really needed, unless you want to add non-NULL
> .data fields in a follow-up. It is usually a good idea to have the more
> specialized compatible strings in the DT, but the driver change won't
> do anything here.
> 
Indeed, this isn't needed.
Will remove it in v4.

Thanks,
Horia