Subject: Re: [PATCH 5/6] net: davinci_emac: Fix ioremap for devices with MDIO within the EMAC address space

From: Felipe Balbi <[email-masked]>
Date: Tue, 13 Jan 2015 13:54:05 -0600

On Tue, Jan 13, 2015 at 11:29:27AM -0800, Tony Lindgren wrote:
> Some devices like dm816x have the MDIO registers within the first EMAC
> instance address space. Let's fix the issue by allowing to pass an
> optional second IO range for the EMAC control register area.
> 
> Cc: Brian Hutchinson <[email-masked]>
> Cc: Felipe Balbi <[email-masked]>
> Signed-off-by: Tony Lindgren <[email-masked]>
> ---
>  drivers/net/ethernet/ti/davinci_emac.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
> index 4c8d82c..0342273 100644
> --- a/drivers/net/ethernet/ti/davinci_emac.c
> +++ b/drivers/net/ethernet/ti/davinci_emac.c
> @@ -1877,7 +1877,7 @@ davinci_emac_of_get_pdata(struct platform_device *pdev, struct emac_priv *priv)
>  static int davinci_emac_probe(struct platform_device *pdev)
>  {
>  	int rc = 0;
> -	struct resource *res;
> +	struct resource *res, *res_ctrl;
>  	struct net_device *ndev;
>  	struct emac_priv *priv;
>  	unsigned long hw_ram_addr;
> @@ -1936,11 +1936,20 @@ static int davinci_emac_probe(struct platform_device *pdev)
>  		rc = PTR_ERR(priv->remap_addr);
>  		goto no_pdata;
>  	}
> +
> +	res_ctrl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	if (res_ctrl) {

devm_ioremap_resource() will check for res_ctrl being a valid pointer,
perhaps below would be slightly better ?

	res_ctrl = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	priv->ctrl_base = devm_ioremap_resource(&pdev->dev, res_ctrl);
	if (IS_ERR(priv->ctrl_base))
		priv->ctrl_base = priv->remap_addr + pdata->ctrl_mod_reg_offset;

-- 
balbi