linux-kernel - Re: [PATCH v3 4/5] clk: mediatek: Add USB clock support in MT8173 APMIXEDSYS

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Date:	Tue, 14 Jul 2015 18:15:58 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	James Liao <jamesjj.liao@...iatek.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Heiko Stubner <heiko@...ech.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Ricky Liang <jcliang@...omium.org>,
	Rob Herring <robh+dt@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 4/5] clk: mediatek: Add USB clock support in MT8173 APMIXEDSYS

On Tue, Jul 14, 2015 at 5:46 PM, James Liao <jamesjj.liao@...iatek.com> wrote:
> Hi Daniel,
>
> On Tue, 2015-07-14 at 11:23 +0800, Daniel Kurtz wrote:
>> On Tue, Jul 14, 2015 at 10:45 AM, James Liao <jamesjj.liao@...iatek.com> wrote:
>> > On Mon, 2015-07-13 at 22:46 +0800, Daniel Kurtz wrote:
>> >> > +static const struct clk_ops mtk_ref2usb_tx_ops = {
>> >> > +       .is_prepared    = mtk_ref2usb_tx_is_prepared,
>> >> > +       .prepare        = mtk_ref2usb_tx_prepare,
>> >> > +       .unprepare      = mtk_ref2usb_tx_unprepare,
>> >> > +};
>> >>
>> >> Burying the implementation of this special "mtk_ref2usb" clock in
>> >> clk-mt8173,c seems a bit awkward.
>> >> Can you please move it to its own file, like mediatek/clk-usb.c?
>> >
>> > Do you mean clk/mediatek/clk-usb.c?
>> >
>> > This clock is a MT8173 specific clock, which may not be reused by other
>> > SoCs. So I think it's not necessary to move it to a separated file.
>>
>> Yes, this is a wrapper for a type of clock.  I think it would be
>> better in its own file, rather than embedded in clk-mt8173.c, which is
>> more about enumerating and initializing the clock tree.
>>
>> Perhaps today it is only used for mt8173, but that may not be the case
>> in the future.
>
> OK, I'll separate it from clk-mt8173.c.
>
> Ref2usb_tx's control register is located in APMIXEDSYS, which contains
> most of PLL controlling. Is this clock suitable to implemented
> mtk-pll.c? Or it's proper to be a separated file such as clk-usb.c?

I think a separate clk-usb.c might be better since the driver is very
different than what is used for the PLLs.

Thanks!
-Dan

> Best regards,
>
> James
>
>
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