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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 25 Jul 2022 19:11:05 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Pandey, Radhey Shyam" <radhey.shyam.pandey@....com>
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

On Mon, Jul 25, 2022 at 02:34:51PM +0000, Pandey, Radhey Shyam wrote:
> > -----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.

Ah, so you ignore the phandle value, and just use the PD_ETH_0?

How robust is this? What if somebody specified a different power
domain?

	Andrew