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

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Message-ID: <20231213110853.07f2be7d@device.home>
Date:   Wed, 13 Dec 2023 11:08:53 +0100
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     Jie Luo <quic_luoj@...cinc.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 Wed, 13 Dec 2023 16:09:53 +0800
Jie Luo <quic_luoj@...cinc.com> wrote:

> 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.
> 

Indeed, my bad I missed that point. Sorry for the noise :/

Thanks,

Maxime