linux-kernel - RE: [EXT] Re: [RESEND PATCH v8 net-next 03/15] net: mvpp2: add CM3 SRAM memory map

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Date:   Sun, 7 Feb 2021 12:21:42 +0000
From:   Stefan Chulski <stefanc@...vell.com>
To:     Baruch Siach <baruch@...s.co.il>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        Yan Markman <ymarkman@...vell.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "atenart@...nel.org" <atenart@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        Nadav Haklai <nadavh@...vell.com>,
        "rmk+kernel@...linux.org.uk" <rmk+kernel@...linux.org.uk>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mw@...ihalf.com" <mw@...ihalf.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "gregory.clement@...tlin.com" <gregory.clement@...tlin.com>,
        "sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [EXT] Re: [RESEND PATCH v8 net-next 03/15] net: mvpp2: add CM3
 SRAM memory map

> >  }
> >
> > +static int mvpp2_get_sram(struct platform_device *pdev,
> > +			  struct mvpp2 *priv)
> > +{
> > +	struct device_node *dn = pdev->dev.of_node;
> > +	static bool defer_once;
> > +	struct resource *res;
> > +
> > +	if (has_acpi_companion(&pdev->dev)) {
> > +		res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> > +		if (!res) {
> > +			dev_warn(&pdev->dev, "ACPI is too old, Flow control
> not supported\n");
> > +			return 0;
> > +		}
> > +		priv->cm3_base = devm_ioremap_resource(&pdev->dev,
> res);
> > +		if (IS_ERR(priv->cm3_base))
> > +			return PTR_ERR(priv->cm3_base);
> > +	} else {
> > +		priv->sram_pool = of_gen_pool_get(dn, "cm3-mem", 0);
> > +		if (!priv->sram_pool) {
> > +			if (!defer_once) {
> > +				defer_once = true;
> > +				/* Try defer once */
> > +				return -EPROBE_DEFER;
> > +			}
> > +			dev_warn(&pdev->dev, "DT is too old, Flow control
> not
> > +supported\n");
> 
> This warning will show on every DT system with no cm3-mem property,
> right?
> 

All DT system would has cm3-mem property if " add CM3 SRAM memory to cp11x ethernet device tree " patch applied.
This is also only warning message, without any functional impact.

Regards,
Stefan.