linux-kernel - Re: [PATCH net-next v2] macb: Common code to enable ptp support for MACB/GEM

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Message-ID: <1bf44464-6f85-64a9-a660-8d2c44015eb9@atmel.com>
Date:   Fri, 27 Jan 2017 11:12:24 +0100
From:   Nicolas Ferre <nicolas.ferre@...el.com>
To:     Harini Katakam <harinikatakamlinux@...il.com>,
        Rafal Ozieblo <rafalo@...ence.com>
CC:     Andrei Pistirica <andrei.pistirica@...rochip.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "harini.katakam@...inx.com" <harini.katakam@...inx.com>,
        "punnaia@...inx.com" <punnaia@...inx.com>,
        "michals@...inx.com" <michals@...inx.com>,
        "anirudh@...inx.com" <anirudh@...inx.com>,
        "boris.brezillon@...e-electrons.com" 
        <boris.brezillon@...e-electrons.com>,
        "alexandre.belloni@...e-electrons.com" 
        <alexandre.belloni@...e-electrons.com>,
        "tbultel@...elsurmer.com" <tbultel@...elsurmer.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>
Subject: Re: [PATCH net-next v2] macb: Common code to enable ptp support for
 MACB/GEM

Le 27/01/2017 à 06:42, Harini Katakam a écrit :
> Hi Rafal,
> 
> On Thu, Jan 26, 2017 at 8:45 PM, Rafal Ozieblo <rafalo@...ence.com> wrote:
>>> -----Original Message-----
>>> From: Andrei Pistirica [mailto:andrei.pistirica@...rochip.com]
>>> Sent: 19 stycznia 2017 16:56
>>> Subject: [PATCH net-next v2] macb: Common code to enable ptp support for MACB/GEM
>>>
>>>
>>> +static inline bool gem_has_ptp(struct macb *bp)
>>> +{
>>> +     return !!(bp->caps & MACB_CAPS_GEM_HAS_PTP);
>>> +}
>> Why don't you use hardware capabilities here? Would it be better to read it from hardware instead adding it to many configuration?
> 
> If you are referring to TSU bit in DCFG5, then we will be relying on
> Cadence IP's information irrespective of the SoC capability
> and whether the PTP support was adequate.
> I think the capability approach gives better control and
> it is not really much to add.

Yes, absolutely. In fact we already had this discussion and decided that
this capability scheme was giving much more control at low cost.

Regards,
-- 
Nicolas Ferre