linux-kernel - RE: [PATCH net-next 2/2] net: macb: Add zynqmp SGMII dynamic configuration support

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Message-ID: <MN0PR12MB59537FD82D25E5B6BE17D1B6B7959@MN0PR12MB5953.namprd12.prod.outlook.com>
Date:   Mon, 25 Jul 2022 14:34:51 +0000
From:   "Pandey, Radhey Shyam" <radhey.shyam.pandey@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "michal.simek@...inx.com" <michal.simek@...inx.com>,
        "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "claudiu.beznea@...rochip.com" <claudiu.beznea@...rochip.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "ronak.jain@...inx.com" <ronak.jain@...inx.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "git@...inx.com" <git@...inx.com>, "git (AMD-Xilinx)" <git@....com>
Subject: RE: [PATCH net-next 2/2] net: macb: Add zynqmp SGMII dynamic
 configuration support

> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Sunday, July 24, 2022 10:24 PM
> To: Pandey, Radhey Shyam <radhey.shyam.pandey@....com>
> Cc: michal.simek@...inx.com; nicolas.ferre@...rochip.com;
> claudiu.beznea@...rochip.com; davem@...emloft.net;
> edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com;
> gregkh@...uxfoundation.org; ronak.jain@...inx.com; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> netdev@...r.kernel.org; git@...inx.com; git (AMD-Xilinx) <git@....com>
> Subject: Re: [PATCH net-next 2/2] net: macb: Add zynqmp SGMII dynamic
> configuration support
> 
> > +		ret = of_property_read_u32_array(pdev->dev.of_node,
> "power-domains",
> > +						 pm_info,
> ARRAY_SIZE(pm_info));
> > +		if (ret < 0) {
> > +			dev_err(&pdev->dev, "Failed to read power
> management information\n");
> > +			return ret;
> > +		}
> > +		ret = zynqmp_pm_set_gem_config(pm_info[1],
> GEM_CONFIG_FIXED, 0);
> > +		if (ret < 0)
> > +			return ret;
> > +
> 
> Documentation/devicetree/bindings/net/cdns,macb.yaml says:
> 
>   power-domains:
>     maxItems: 1
> 
> Yet you are using pm_info[1]?

>From power-domain description - It's a phandle and PM domain 
specifier as defined by bindings of the power controller specified
by phandle.

I assume the numbers of cells is specified by "#power-domain-cells":
Power-domain-cell is set to 1 in this case.

arch/arm64/boot/dts/xilinx/zynqmp.dtsi
#power-domain-cells = <1>;
power-domains = <&zynqmp_firmware PD_ETH_0>;

Please let me know your thoughts.

> 
>     Andrew