linux-kernel - RE: [PATCH v3 9/9] PCI: imx: add the imx8mm pcie support

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Message-ID: <AS8PR04MB8676F18EF63A0C014047FC4F8CB89@AS8PR04MB8676.eurprd04.prod.outlook.com>
Date:   Thu, 14 Oct 2021 01:20:41 +0000
From:   Richard Zhu <hongxing.zhu@....com>
To:     Matthias Schiffer <matthias.schiffer@...tq-group.com>
CC:     "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "tharvey@...eworks.com" <tharvey@...eworks.com>,
        "kishon@...com" <kishon@...com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "robh@...nel.org" <robh@...nel.org>,
        "galak@...nel.crashing.org" <galak@...nel.crashing.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
Subject: RE: [PATCH v3 9/9] PCI: imx: add the imx8mm pcie support


> -----Original Message-----
> From: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> Sent: Wednesday, October 13, 2021 8:46 PM
> To: Richard Zhu <hongxing.zhu@....com>
> Cc: linux-phy@...ts.infradead.org; devicetree@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> kernel@...gutronix.de; dl-linux-imx <linux-imx@....com>;
> l.stach@...gutronix.de; tharvey@...eworks.com; kishon@...com;
> vkoul@...nel.org; robh@...nel.org; galak@...nel.crashing.org;
> shawnguo@...nel.org
> Subject: Re: [PATCH v3 9/9] PCI: imx: add the imx8mm pcie support
> 
> On Tue, 2021-10-12 at 16:41 +0800, Richard Zhu wrote:
> > i.MX8MM PCIe works mostly like the i.MX8MQ one, but has a different
> > PHY and allows to output the internal PHY reference clock via the refclk
> pad.
> > Add the i.MX8MM PCIe support based on the standalone PHY driver.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> > [...]
> > @@ -1130,6 +1176,14 @@ static int imx6_pcie_probe(struct
> platform_device *pdev)
> >  				 &imx6_pcie->tx_swing_low))
> >  		imx6_pcie->tx_swing_low = 127;
> >
> > +	/* get PHY refclk pad mode if there is PHY node */
> > +	phy_node = of_parse_phandle(node, "phys", 0);
> > +	if (phy_node) {
> > +		of_property_read_u32(phy_node, "fsl,refclk-pad-mode",
> > +				     &imx6_pcie->refclk_pad_mode);
> 
> It seems to me that the refclk_pad_mode is not actually used by this driver
> anymore, because it is handled by the PHY driver now. Is there a reason to
> read this property here at all?
>
[Richard Zhu] Good caught. I forgot to clean up the refclk_pad_mode in controller driver.
Would remove these codes later. Thanks a lot.

Best Regards
Richard Zhu