netdev - Re: [PATCH v2 3/5] net: mdio: ipq4019: configure CMN PLL clock for ipq5332

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Date: Wed, 13 Dec 2023 16:09:53 +0800
From: Jie Luo <quic_luoj@...cinc.com>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
CC: <agross@...nel.org>, <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <andrew@...n.ch>, <hkallweit1@...il.com>, <linux@...linux.org.uk>,
        <robert.marko@...tura.hr>, <linux-arm-msm@...r.kernel.org>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_srichara@...cinc.com>
Subject: Re: [PATCH v2 3/5] net: mdio: ipq4019: configure CMN PLL clock for
 ipq5332



On 12/12/2023 8:54 PM, Maxime Chevallier wrote:
> Hello,
> 
> I have some more minor comments for yoi :)
> 
> On Tue, 12 Dec 2023 19:51:48 +0800
> Luo Jie <quic_luoj@...cinc.com> wrote:
> 
>> The reference clock of CMN PLL block is selectable, the internal
>> 48MHZ is used by default.
>>
>> The output clock of CMN PLL block is for providing the clock
>> source of ethernet device(such as qca8084), there are 1 * 25MHZ
>> and 3 * 50MHZ output clocks available for the ethernet devices.
>>
>> Signed-off-by: Luo Jie <quic_luoj@...cinc.com>
>> ---
> 
> [...]
> 
>> +/* For the CMN PLL block, the reference clock can be configured according to
>> + * the device tree property "cmn-reference-clock", the internal 48MHZ is used
>> + * by default on the ipq533 platform.
>> + *
>> + * The output clock of CMN PLL block is provided to the ethernet devices,
>> + * threre are 4 CMN PLL output clocks (1*25MHZ + 3*50MHZ) enabled by default.
>> + *
>> + * Such as the output 50M clock for the qca8084 ethernet PHY.
>> + */
>> +static int ipq_cmn_clock_config(struct mii_bus *bus)
>> +{
>> +	int ret;
>> +	u32 reg_val, src_sel, ref_clk;
>> +	struct ipq4019_mdio_data *priv;
> 
> Here you should also use reverse christmas-tree notation

Ok, will correct this, thanks.

> 
> [...]
> 
>> @@ -317,6 +441,17 @@ static int ipq4019_mdio_probe(struct platform_device *pdev)
>>   		}
>>   	}
>>   
>> +	/* The CMN block resource is for providing clock source to ethernet,
>> +	 * which can be optionally configured on the platform ipq9574 and
>> +	 * ipq5332.
>> +	 */
>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cmn_blk");
>> +	if (res) {
>> +		priv->cmn_membase = devm_ioremap_resource(&pdev->dev, res);
>> +		if (IS_ERR(priv->cmn_membase))
>> +			return PTR_ERR(priv->cmn_membase);
>> +	}
>> +
> 
> And here you can simplify a bit by using
> devm_platform_ioremap_resource_byname()
> 
> Thanks,
> 
> Maxime
> 
As Russell mentioned, since this resource is optional,
so devm_platform_ioremap_resource_byname can't be used here.