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

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Date:	Fri, 23 Aug 2013 21:14:32 +0200
From:	Daniel Mack <zonque@...il.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:	netdev@...r.kernel.org, bcousson@...libre.com, nsekhar@...com,
	davem@...emloft.net, ujhelyi.m@...il.com, mugunthanvnm@...com,
	vaibhav.bedia@...com, d-gerlach@...com,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v5 2/5] net: ethernet: cpsw: add optional third memory
 region for CONTROL module

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 <zonque@...il.com>
>> ---
>>   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

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