linux-kernel - Re: [PATCH v2] net: mdio-ipq4019: Fix the error for an optional regs resource

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Date:   Tue, 28 Sep 2021 17:26:33 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Cai Huoqing <caihuoqing@...du.com>
Cc:     horatiu.vultur@...rochip.com, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: mdio-ipq4019: Fix the error for an optional regs
 resource

On Tue, Sep 28, 2021 at 09:48:49PM +0800, Cai Huoqing wrote:
> The second resource is optional which is only provided on the chipset
> IPQ5018. But the blamed commit ignores that and if the resource is
> not there it just fails.
> 
> the resource is used like this,
> 	if (priv->eth_ldo_rdy) {
> 		val = readl(priv->eth_ldo_rdy);
> 		val |= BIT(0);
> 		writel(val, priv->eth_ldo_rdy);
> 		fsleep(IPQ_PHY_SET_DELAY_US);
> 	}
> 
> This patch reverts that to still allow the second resource to be optional
> because other SoC have the some MDIO controller and doesn't need to
> second resource.
> 
> Fixes: fa14d03e014a ("net: mdio-ipq4019: Make use of devm_platform_ioremap_resource()")
> Signed-off-by: Cai Huoqing <caihuoqing@...du.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew