linux-kernel - Re: [PATCH v3 2/3] hwrng: add Rockchip SoC hwrng driver

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Message-ID: <303bc9df-c887-41d0-8613-0fa2898ab48e@kernel.org>
Date: Sat, 22 Jun 2024 20:05:03 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dragan Simic <dsimic@...jaro.org>
Cc: Daniel Golle <daniel@...rotopia.org>,
 Aurelien Jarno <aurelien@...el32.net>, Olivia Mackall <olivia@...enic.com>,
 Herbert Xu <herbert@...dor.apana.org.au>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
 Philipp Zabel <p.zabel@...gutronix.de>,
 Uwe Kleine-König <ukleinek@...ian.org>,
 Sebastian Reichel <sebastian.reichel@...labora.com>,
 Anand Moon <linux.amoon@...il.com>, Sascha Hauer <s.hauer@...gutronix.de>,
 Martin Kaiser <martin@...ser.cx>, Ard Biesheuvel <ardb@...nel.org>,
 linux-crypto@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] hwrng: add Rockchip SoC hwrng driver

On 21/06/2024 20:13, Dragan Simic wrote:
> Hello Krzysztof,
> 
> On 2024-06-21 11:57, Krzysztof Kozlowski wrote:
>> On 21/06/2024 03:25, Daniel Golle wrote:
>>> From: Aurelien Jarno <aurelien@...el32.net>
> 
> [snip]
> 
>>> +	pm_runtime_set_autosuspend_delay(dev, RK_RNG_AUTOSUSPEND_DELAY);
>>> +	pm_runtime_use_autosuspend(dev);
>>> +	pm_runtime_enable(dev);
>>> +
>>> +	ret = devm_hwrng_register(dev, &rk_rng->rng);
>>> +	if (ret)
>>> +		return dev_err_probe(&pdev->dev, ret, "Failed to register Rockchip 
>>> hwrng\n");
>>> +
>>> +	dev_info(&pdev->dev, "Registered Rockchip hwrng\n");
>>
>> Drop, driver should be silent on success.
> 
> I respectfully disagree.  Many drivers print a single line upon
> successful probing, which I find very useful.  In this particular

No, it's duplicating existing interfaces and polluting log unnecessarily
without any useful information.

> case, it's even more useful, because some people may be concerned
> about the use of hardware TRNGs, so we should actually make sure
> to announce it.

Best regards,
Krzysztof