linux-kernel - Re: [RFC PATCH 3/3] devicetree: macb: Add optional property tsu-clk

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Message-ID: <CAFcVECK=EONgqPq1jt_kti-VKXPWGVj3OSnqUvo0YcR65Z+Phg@mail.gmail.com>
Date:	Mon, 14 Sep 2015 09:39:05 +0530
From:	Harini Katakam <harinikatakamlinux@...il.com>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
Cc:	Harini Katakam <harini.katakam@...inx.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>, davem@...emloft.net,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	boris.brezillon@...e-electrons.com,
	alexandre.belloni@...e-electrons.com, netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Punnaiah Choudary Kalluri <punnaia@...inx.com>,
	"michals@...inx.com" <michals@...inx.com>, anirudh@...inx.com
Subject: Re: [RFC PATCH 3/3] devicetree: macb: Add optional property tsu-clk

On Fri, Sep 11, 2015 at 10:22 PM, Sören Brinkmann
<soren.brinkmann@...inx.com> wrote:
> Hi Harini,
>
> On Fri, 2015-09-11 at 01:27PM +0530, Harini Katakam wrote:
>> Add TSU clock frequency to be used for 1588 support in macb driver.
>>
>> Signed-off-by: Harini Katakam <harinik@...inx.com>
>> ---
>>  Documentation/devicetree/bindings/net/macb.txt |    3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/net/macb.txt b/Documentation/devicetree/bindings/net/macb.txt
>> index b5d7976..f7c0ea8 100644
>> --- a/Documentation/devicetree/bindings/net/macb.txt
>> +++ b/Documentation/devicetree/bindings/net/macb.txt
>> @@ -19,6 +19,9 @@ Required properties:
>>       Optional elements: 'tx_clk'
>>  - clocks: Phandles to input clocks.
>>
>> +Optional properties:
>> +- tsu-clk: Time stamp unit clock frequency used.
>
> Why are we not using the CCF and a clk_get_rate() in the driver?
>

If the clock source was only internal, we could use this
approach as usual. But TSU clock can be configured to
come from an external clock source or internal.

Regards,
Harini
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