linux-kernel - [PATCH v4 1/2] hwrng: imx-rngc: Use optional clock

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Message-Id: <20251126-b4-m5441x-add-rng-support-v4-1-5309548c9555@yoseli.org>
Date: Wed, 26 Nov 2025 08:08:09 +0100
From: Jean-Michel Hautbois via B4 Relay <devnull+jeanmichel.hautbois.yoseli.org@...nel.org>
To: 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>
Cc: 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, 
 Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>, 
 Frank Li <Frank.Li@....com>
Subject: [PATCH v4 1/2] hwrng: imx-rngc: Use optional clock

From: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>

Change devm_clk_get() to devm_clk_get_optional() to support platforms
where the RNG clock is always enabled and not exposed via the clock
framework (such as ColdFire MCF54418).

Reviewed-by: Frank Li <Frank.Li@....com>
Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
---
 drivers/char/hw_random/imx-rngc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
index 241664a9b5d9..d6a847e48339 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);
 
-	rngc->clk = devm_clk_get(&pdev->dev, NULL);
+	rngc->clk = 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");
 

-- 
2.39.5