linux-kernel - Re: [PATCH] m68k: coldfire: Add RNG support for MCF54418

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Message-ID: <aQzHO6Ty+l1Bwt6N@lizhi-Precision-Tower-5810>
Date: Thu, 6 Nov 2025 11:05:15 -0500
From: Frank Li <Frank.li@....com>
To: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
Cc: Greg Ungerer <gerg@...ux-m68k.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Olivia Mackall <olivia@...enic.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, linux-m68k@...ts.linux-m68k.org,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] m68k: coldfire: Add RNG support for MCF54418

On Thu, Nov 06, 2025 at 08:10:08AM +0100, Jean-Michel Hautbois wrote:
> Add platform device support for the MCF54418 RNGB hardware with clock
> enabled at platform initialization.
>
> The imx-rngc driver now uses devm_clk_get_optional() to support both
> Coldfire (always-on clock) and i.MX platforms (managed clock).
>
> Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
> ---
>  arch/m68k/coldfire/device.c       | 28 ++++++++++++++++++++++++++++
>  arch/m68k/coldfire/m5441x.c       |  2 +-
>  arch/m68k/include/asm/m5441xsim.h |  9 +++++++++
>  drivers/char/hw_random/Kconfig    |  3 ++-
>  drivers/char/hw_random/imx-rngc.c |  9 ++++++++-
>  5 files changed, 48 insertions(+), 3 deletions(-)
>
> diff --git a/arch/m68k/coldfire/device.c b/arch/m68k/coldfire/device.c
> index b6958ec2a220cf91a78a14fc7fa18749451412f7..9d8f844e319a98f0afb79cceb544c2d3029482a4 100644
> --- a/arch/m68k/coldfire/device.c
> +++ b/arch/m68k/coldfire/device.c
> @@ -622,6 +622,31 @@ static struct platform_device mcf_flexcan0 = {
>  };
>  #endif /* MCFFLEXCAN_SIZE */
>
> +#ifdef MCF_RNG_BASE
> +/*
> + * Random Number Generator (RNG) - only on MCF54418
> + */
> +static struct resource mcf_rng_resource[] = {

const?

Frank
> +	{
> +		.start = MCF_RNG_BASE,
> +		.end   = MCF_RNG_BASE + MCF_RNG_SIZE - 1,
> +		.flags = IORESOURCE_MEM,
> +	},
> +	{
> +		.start = MCF_IRQ_RNG,
> +		.end   = MCF_IRQ_RNG,
> +		.flags = IORESOURCE_IRQ,
> +	},
> +};
...