netdev - Re: stmmac DT property snps,axi

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Date:   Fri, 9 Dec 2016 10:20:36 +0100
From:   Niklas Cassel <niklas.cassel@...s.com>
To:     Alexandre Torgue <alexandre.torgue@...com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>
CC:     <netdev@...r.kernel.org>
Subject: Re: stmmac DT property snps,axi_all

On 12/08/2016 02:36 PM, Alexandre Torgue wrote:
> Hi Niklas,
>
> On 12/05/2016 05:18 PM, Niklas Cassel wrote:
>> Hello Giuseppe
>>
>>
>> I'm trying to figure out what snps,axi_all is supposed to represent.
>>
>> It appears that the value is saved, but never used in the code.
>>
>> Looking at the register specification, I'm guessing that it represents
>> Address-Aligned Beats, but there is already the property snps,aal
>> for that.
>
> IMO, it is not useful. Indeed AXI_AAL is a read only bit (in AXI bus mode register) and reflects the aal bit in DMA bus register.
> As you know we use "snps,aal" to set aal bit in DMA bus register.
> So "snps,axi_all" entry seems useless. Let's see with Peppe.

Ok, I see. GMAC and GMAC4 is different here.

For GMAC4 AAL only exists in DMA_SYS_BUS_MODE.
It's not reflected anywhere else.

The code is correct in the driver.

If snps,axi_all is just created for a read-only register,
and it is currently never used in the code,
while we have snps,aal, which is correct and works,
I guess it should be ok to remove snps,axi_all.

I can cook up a patch.

>
> Regards
> Alex
>
>>
>>
>> Regards,
>> Niklas
>>