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smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=yoseli.org; spf=pass smtp.mailfrom=yoseli.org; dkim=pass (2048-bit key) header.d=yoseli.org header.i=@yoseli.org header.b=ePqhz+nN; arc=none smtp.client-ip=217.70.183.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=yoseli.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=yoseli.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=yoseli.org header.i=@yoseli.org header.b="ePqhz+nN" Received: by mail.gandi.net (Postfix) with ESMTPSA id AB1FA43A9F; Thu, 6 Nov 2025 07:10:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yoseli.org; s=gm1; t=1762413019; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=se9ZVkwDfZskJyefQ4PD7YcMnmdBn5z+ttednA8HNWM=; b=ePqhz+nNotpkD0RWe85w8hKLRwnRlZcmeFsSjxDf5hpYxFrudIBpskGODN1xsnZjUgFql2 8PqpT1fpdC6vsHsu2hLyzZ/L9JqdUP2qdOFx1TRoaRES0vbcFvz1ETdrMwkwd3p3HX6AOD bYNiPoPQcsjnQXZy/ND5yRzHiXKQukcy7CGBTJhSBipXKl3Nyf3zORhxkK41g8zSoa9HRw +fmZNhv2P0aGi+sR02JxjH1uD+UxaI0B97aYEukSQomaBtZi4CIfRB0b1v+ebQYxrccJI9 Di4puQfzqFRTCWjhJ91gCK3RIl+D1Xg7fvByliLRGBtCUPGh0XO8UhDvxHQknA== From: Jean-Michel Hautbois Date: Thu, 06 Nov 2025 08:10:08 +0100 Subject: [PATCH] m68k: coldfire: Add RNG support for MCF54418 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251106-m5441x-add-rng-support-v1-1-ee8230910d17@yoseli.org> X-B4-Tracking: v=1; b=H4sIANBJDGkC/x3MPQqAMAxA4atIZgNN8Qe8ijiUNmoGa0lVBPHuF sdveO+BzCqcYageUL4kyx4LqK7Ary4ujBKKwRrbEpkOt7Zp6EYXAmpcMJ8p7Xqg8TN1rvfeOoI SJ+VZ7n88Tu/7AYGjWe5oAAAA X-Change-ID: 20251106-m5441x-add-rng-support-0cf16a7cc2a1 To: Greg Ungerer , Geert Uytterhoeven , Olivia Mackall , Herbert Xu , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam Cc: linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Jean-Michel Hautbois X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1762413016; l=5704; i=jeanmichel.hautbois@yoseli.org; s=20240925; h=from:subject:message-id; bh=WwjMVtp0Q8LvotEJwl+0hsaBB9QSKXKdIxX8wWxqlK8=; b=fJW6JO8RQ5ehXsSHILY8UDSTYbv/JU4FVdLFSifqpjH4gvuSmWZCOBt7yX8bMBzUN2IGasc+X 26+DaeOW1EOB+WEo/E64lXUEQivwO3huInbJ/vLf4LdEmCeRXbwy1d/ X-Developer-Key: i=jeanmichel.hautbois@yoseli.org; a=ed25519; pk=MsMTVmoV69wLIlSkHlFoACIMVNQFyvJzvsJSQsn/kq4= X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdeggddukeeiudegucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhfffugggtgffkvfevofesthejredtredtjeenucfhrhhomheplfgvrghnqdfoihgthhgvlhcujfgruhhtsghoihhsuceojhgvrghnmhhitghhvghlrdhhrghuthgsohhisheshihoshgvlhhirdhorhhgqeenucggtffrrghtthgvrhhnpefggfetteeuteegueetgeetvdetjeevueeguedvudfgfeegffektdevvdefvdffheenucfkphepvdgrtddumegvtdgrmeduieelmeejudegtdemgedvtggsmeeltgefudemieehfhgumegrvgekleenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpedvrgdtudemvgdtrgemudeileemjedugedtmeegvdgtsgemlegtfedumeeihehfugemrggvkeelpdhhvghlohephihoshgvlhhiqdihohgtthhordihohhsvghlihdrohhrghdpmhgrihhlfhhrohhmpehjvggrnhhmihgthhgvlhdrhhgruhhtsghoihhsseihohhsvghlihdrohhrghdpnhgspghrtghpthhtohepudegpdhrtghpthhtohepohhlihhvihgrsehsvghlvghnihgtrdgtohhmpdhrtghpthhtohepghgvvghrtheslhhinhhugidqmheikehkrdhorhhgpdhrtghpthhtoheplhhinhhugidqmheikehks ehlihhsthhsrdhlihhnuhigqdhmieekkhdrohhrghdprhgtphhtthhopehimhigsehlihhsthhsrdhlihhnuhigrdguvghvpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtoheplhhinhhugidqrghrmhdqkhgvrhhnvghlsehlihhsthhsrdhinhhfrhgruggvrggurdhorhhgpdhrtghpthhtohepjhgvrghnmhhitghhvghlrdhhrghuthgsohhisheshihoshgvlhhirdhorhhgpdhrtghpthhtohepkhgvrhhnvghlsehpvghnghhuthhrohhnihigrdguvg X-GND-Sasl: jeanmichel.hautbois@yoseli.org 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 --- 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..9d8f844e319a98f0afb79cceb54= 4c2d3029482a4 100644 --- a/arch/m68k/coldfire/device.c +++ b/arch/m68k/coldfire/device.c @@ -622,6 +622,31 @@ static struct platform_device mcf_flexcan0 =3D { }; #endif /* MCFFLEXCAN_SIZE */ =20 +#ifdef MCF_RNG_BASE +/* + * Random Number Generator (RNG) - only on MCF54418 + */ +static struct resource mcf_rng_resource[] =3D { + { + .start =3D MCF_RNG_BASE, + .end =3D MCF_RNG_BASE + MCF_RNG_SIZE - 1, + .flags =3D IORESOURCE_MEM, + }, + { + .start =3D MCF_IRQ_RNG, + .end =3D MCF_IRQ_RNG, + .flags =3D IORESOURCE_IRQ, + }, +}; + +static struct platform_device mcf_rng =3D { + .name =3D "imx-rngc", + .id =3D -1, + .num_resources =3D ARRAY_SIZE(mcf_rng_resource), + .resource =3D mcf_rng_resource, +}; +#endif /* MCF_RNG_BASE */ + static struct platform_device *mcf_devices[] __initdata =3D { &mcf_uart, #ifdef MCFFEC_BASE0 @@ -660,6 +685,9 @@ static struct platform_device *mcf_devices[] __initdata= =3D { #ifdef MCFFLEXCAN_SIZE &mcf_flexcan0, #endif +#ifdef MCF_RNG_BASE + &mcf_rng, +#endif }; =20 /* diff --git a/arch/m68k/coldfire/m5441x.c b/arch/m68k/coldfire/m5441x.c index 7a25cfc7ac07570ff15da3c55d080a717cf93a06..ab5b006372379294db3b522820d= e88137bfb7e78 100644 --- a/arch/m68k/coldfire/m5441x.c +++ b/arch/m68k/coldfire/m5441x.c @@ -158,6 +158,7 @@ static struct clk * const enable_clks[] __initconst =3D= { &__clk_0_33, /* pit.1 */ &__clk_0_37, /* eport */ &__clk_0_48, /* pll */ + &__clk_0_49, /* rng */ &__clk_0_51, /* esdhc */ =20 &__clk_1_36, /* CCM/reset module/Power management */ @@ -179,7 +180,6 @@ static struct clk * const disable_clks[] __initconst = =3D { &__clk_0_44, /* usb otg */ &__clk_0_45, /* usb host */ &__clk_0_47, /* ssi.0 */ - &__clk_0_49, /* rng */ &__clk_0_50, /* ssi.1 */ &__clk_0_53, /* enet-fec */ &__clk_0_54, /* enet-fec */ diff --git a/arch/m68k/include/asm/m5441xsim.h b/arch/m68k/include/asm/m544= 1xsim.h index f48cf63bd7822fd53c33788128f984585c0c421a..dd64cdfcad3e810254c6854b9de= 5b6bbeb67b950 100644 --- a/arch/m68k/include/asm/m5441xsim.h +++ b/arch/m68k/include/asm/m5441xsim.h @@ -198,6 +198,15 @@ #define MCFRTC_SIZE (0xfc0a8840 - 0xfc0a8000) #define MCF_IRQ_RTC (MCFINT2_VECBASE + MCFINT2_RTC) =20 +/* + * Random Number Generator (RNG) Module. + * Note: Only present in MCF54418, not in MCF54410/54415/54417 + */ +#define MCF_RNG_BASE 0xfc0c4000 +#define MCF_RNG_SIZE 0x1c +#define MCFINT2_RNG 28 +#define MCF_IRQ_RNG (MCFINT2_VECBASE + MCFINT2_RNG) + /* * GPIO Module. */ diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 492a2a61a65be8bd9e46b0a70f3e43703973512e..e046eabaac2d9053a5a4a98c6e3= 733bb19258e54 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -270,12 +270,13 @@ config HW_RANDOM_MXC_RNGA config HW_RANDOM_IMX_RNGC tristate "Freescale i.MX RNGC Random Number Generator" depends on HAS_IOMEM - depends on SOC_IMX25 || SOC_IMX6SL || SOC_IMX6SLL || SOC_IMX6UL || COMPIL= E_TEST + depends on SOC_IMX25 || SOC_IMX6SL || SOC_IMX6SLL || SOC_IMX6UL || M5441x= || COMPILE_TEST default HW_RANDOM help This driver provides kernel-side support for the Random Number Generator Version C hardware found on some Freescale i.MX processors. Version B is also supported by this driver. + Also supports RNGB on Freescale MCF54418 (Coldfire V4e). =20 To compile this driver as a module, choose M here: the module will be called imx-rngc. diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx= -rngc.c index 241664a9b5d9ac7244f15cbe5d5302ca3787ebea..44f20a05de0a425cb6ff7b2a347= b111750ac3702 100644 --- a/drivers/char/hw_random/imx-rngc.c +++ b/drivers/char/hw_random/imx-rngc.c @@ -259,7 +259,7 @@ static int __init imx_rngc_probe(struct platform_device= *pdev) if (IS_ERR(rngc->base)) return PTR_ERR(rngc->base); =20 - rngc->clk =3D devm_clk_get(&pdev->dev, NULL); + rngc->clk =3D devm_clk_get_optional(&pdev->dev, NULL); if (IS_ERR(rngc->clk)) return dev_err_probe(&pdev->dev, PTR_ERR(rngc->clk), "Cannot get rng_clk= \n"); =20 @@ -353,12 +353,19 @@ static const struct of_device_id imx_rngc_dt_ids[] = =3D { }; MODULE_DEVICE_TABLE(of, imx_rngc_dt_ids); =20 +static const struct platform_device_id imx_rngc_devtype[] =3D { + { .name =3D "imx-rngc" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, imx_rngc_devtype); + static struct platform_driver imx_rngc_driver =3D { .driver =3D { .name =3D KBUILD_MODNAME, .pm =3D pm_ptr(&imx_rngc_pm_ops), .of_match_table =3D imx_rngc_dt_ids, }, + .id_table =3D imx_rngc_devtype, }; =20 module_platform_driver_probe(imx_rngc_driver, imx_rngc_probe); --- base-commit: dc77806cf3b4788d328fddf245e86c5b529f31a2 change-id: 20251106-m5441x-add-rng-support-0cf16a7cc2a1 Best regards, --=20 Jean-Michel Hautbois