linux-kernel - Re: [PATCH v2 2/4] hwrng: stm32 - implement support for STM32MP25x platforms

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Message-ID: <f191d034-4116-4169-8c05-201450412bbd@foss.st.com>
Date: Mon, 14 Oct 2024 10:38:36 +0200
From: Gatien CHEVALLIER <gatien.chevallier@...s.st.com>
To: Marek Vasut <marex@...x.de>, 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>,
        Maxime
 Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Lionel Debieve <lionel.debieve@...s.st.com>
CC: <linux-crypto@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] hwrng: stm32 - implement support for STM32MP25x
 platforms



On 10/11/24 18:17, Marek Vasut wrote:
> On 10/11/24 5:41 PM, Gatien Chevallier wrote:
> 
> [...]
> 
>> @@ -551,6 +565,41 @@ static int stm32_rng_probe(struct platform_device 
>> *ofdev)
>>       priv->rng.read = stm32_rng_read;
>>       priv->rng.quality = 900;
>> +    if (!priv->data->nb_clock || priv->data->nb_clock > 2)
>> +        return -EINVAL;
>> +
>> +    priv->clk_bulk = devm_kzalloc(dev, priv->data->nb_clock * 
>> sizeof(*priv->clk_bulk),
>> +                      GFP_KERNEL);
>> +    if (!priv->clk_bulk)
>> +        return -ENOMEM;
> 
> Try this:
> 
> ret = devm_clk_bulk_get(dev, priv->data->nb_clock, priv->clk_bulk);
> ...
> // Swap the clock if they are not in the right order:
> if (priv->data->nb_clock == 2 &&
>      strcmp(__clk_get_name(priv->clk_bulk[0].clk), "core"))
> {
>   const char *id = priv->clk_bulk[1].id;
>   struct clk *clk = priv->clk_bulk[1].clk;
>   priv->clk_bulk[1].id = priv->clk_bulk[0].id;
>   priv->clk_bulk[1].clk = priv->clk_bulk[0].clk;
>   priv->clk_bulk[0].id = id;
>   priv->clk_bulk[0].clk = clk;
> }
> 

Hi Marek,

This won't work as the name returned by this API is clk->core->name.
AFAICT, it doesn't correspond to the names present in the device tree
under the "clock-names" property.
Any other idea or are you fine with what's below?

Thanks,
Gatien

>> +    if (priv->data->nb_clock == 2) {
>> +        struct clk *clk;
>> +        struct clk *bus_clk;
>> +
>> +        clk = devm_clk_get(&ofdev->dev, "core");
>> +        if (IS_ERR(clk))
>> +            return PTR_ERR(clk);
>> +
>> +        bus_clk = devm_clk_get(&ofdev->dev, "bus");
>> +        if (IS_ERR(clk))
>> +            return PTR_ERR(bus_clk);
>> +
>> +        priv->clk_bulk[0].clk = clk;
>> +        priv->clk_bulk[0].id = "core";
>> +        priv->clk_bulk[1].clk = bus_clk;
>> +        priv->clk_bulk[1].id = "bus";
>> +    } else {
>> +        struct clk *clk;
>> +
>> +        clk = devm_clk_get(&ofdev->dev, NULL);
>> +        if (IS_ERR(clk))
>> +            return PTR_ERR(clk);
>> +
>> +        priv->clk_bulk[0].clk = clk;
>> +        priv->clk_bulk[0].id = "core";
>> +    }
>