Subject: Re: [PATCH v5 2/5] net: ethernet: cpsw: add optional third memory region for CONTROL module

From: Daniel Mack <[email-masked]>
Date: Fri, 23 Aug 2013 21:14:32 +0200

On 23.08.2013 21:10, Sergei Shtylyov wrote:
> Hello.
> 
> On 08/23/2013 10:53 PM, Daniel Mack wrote:
> 
>> At least the AM33xx SoC has a control module register to configure
>> details such as the hardware ethernet interface mode.
> 
>> I'm not sure whether all SoCs which feature the cpsw block have such a
>> register, so that third memory region is considered optional for now.
> 
>> Signed-off-by: Daniel Mack <[email-masked]>
>> ---
>>   Documentation/devicetree/bindings/net/cpsw.txt | 5 ++++-
>>   drivers/net/ethernet/ti/cpsw.c                 | 5 +++++
>>   2 files changed, 9 insertions(+), 1 deletion(-)
> 
>> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
>> index fc3263f..4feba2f 100644
>> --- a/drivers/net/ethernet/ti/cpsw.c
>> +++ b/drivers/net/ethernet/ti/cpsw.c
> [...]
>> @@ -1989,6 +1990,10 @@ static int cpsw_probe(struct platform_device *pdev)
>>   		goto clean_runtime_disable_ret;
>>   	}
>>
>> +	/* Don't fail hard if the optional control memory region is missing */
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
>> +	priv->gmii_sel_reg = devm_ioremap_resource(&pdev->dev, res);
> 
>     Hm, but why now you don't fail if devm_ioremap_resource() fails?

Well, because I thought maybe we should just ignore failures of that
kind altogether for this optional resource. There will still be a
warning in that case. Did you like the old approach better?

Daniel