linux-kernel - Re: [PATCH RFC net-next 3/3] net: phy: mscc-miim: add support to set MDIO bus frequency

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Date:   Thu, 31 Mar 2022 18:44:41 +0200
From:   Michael Walle <michael@...le.cc>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next 3/3] net: phy: mscc-miim: add support to set
 MDIO bus frequency

Am 2022-03-31 18:28, schrieb Andrew Lunn:
>> @@ -295,21 +323,41 @@ static int mscc_miim_probe(struct 
>> platform_device *pdev)
>>  	if (!miim->info)
>>  		return -EINVAL;
>> 
>> -	ret = of_mdiobus_register(bus, pdev->dev.of_node);
>> +	miim->clk = devm_clk_get_optional(&pdev->dev, NULL);
>> +	if (IS_ERR(miim->clk))
>> +		return PTR_ERR(miim->clk);
>> +
>> +	ret = clk_prepare_enable(miim->clk);
>> +	if (ret)
>> +		return ret;
>> +
>> +	of_property_read_u32(np, "clock-frequency", &miim->clk_freq);
> 
> The clock is optional if there is no "clock-frequency" property.  If
> the property does exist, the clock should be mandatory. I don't think
> it should silently fail setting the bus frequency because the clock is
> missing.

Oh yes, agreed.

-michael